Toyota TOYOTA COMPUTER-CONTROLLED SYSTEM Training Manual Download Page 1

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training manual

VOLUME

STEP

TCCS
(TOYOTA COMPUTER-
CONTROLLED SYSTEM)

Summary of Contents for TOYOTA COMPUTER-CONTROLLED SYSTEM

Page 1: ...training manual VOLUME 1 STEP 3 TCCS TOYOTA COMPUTER CONTROLLED SYSTEM ...

Page 2: ...ining Manual The top of each page is marked either with a Q symbol to indicate that it is a Theory page or a symbol to indicate that it is a Practice page Note that in regards to inspection and other procedures mentioned in the Practice section this Training Manual contains only the main points to be learned please refer to the relevant Repair Manual s for details The following notations often occ...

Page 3: ... this way explanations of as many mechanisms as possible have been included All information contained in this manual is the most up to date at the time of publication However we reserve the right to make changes without prior notice TOYOTA MOTOR CORPORATIO N 1997 TOYOTA MOTOR CORPORATION All rights reserved This book may not be repro duced or copied in whole or in part without the written permissi...

Page 4: ...EN SENSOR 02 SENSOR 30 1 1 Zirconia element type 30 1 2 Titania element type 32 LEAN MIXTURE SENSOR 33 Page VEHICLE SPEED SENSOR 34 1 Reed switch type 34 2 Photocoupler type 34 3 Electromagnetic pickup type 35 4 MRE type 36 STA SIGNAL 38 NSW SIGNAL 38 A C SIGNAL 39 ELECTRICAL LOAD SIGNAL 39 FUEL CONTROL SWITCH OR CONNECTOR 40 EGR GAS TEMPERATURE SENSOR 40 VARIABLE RESISTOR 41 KICK DOWN SWITCH 42 W...

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Page 6: ...E 162 IS SYMPTOM SIMULATION 163 BASIC INSPECTION 167 INSPECTION AND ADJUSTMEN T GENERAL 171 IDLE SPEED AND IDLE MIXTURE 172 MANIFOLD PRESSURE SENSOR VACUUM SENSOR 175 THROTTLE POSITION SENSO R LINEAR TYPE AND THROTTL E BODY 177 DISTRIBUTOR G AND NE SIGNALS 180 INTAKE AIR TEMPERATURE SENSOR 181 FEEDBACK CORRECTION 182 Models with oxygen senso r 02 sensor 182 Models with lean mixture sensor 183 VARI...

Page 7: ...M T Manual Transmission NOx Oxides of Nitrogen OC Oxidation Catalyst OD Overdrive 02 Oxygen PS Power Steering SCV Swirl Control Valve SST Special Service Tool SW Switch TCCS Toyota Computer Controlled System TDC Top Dead Cente r TDCL 1 Toyota Diagnostic Communication Link or Total Diagnostic Communication Link TEMS Toyota Electronically Modulated Suspension Tr Transistor TRC 2 Traction Contro l T ...

Page 8: ...tle Position Sensor IGDA Ignition Distribution Signal A IGDB Ignition Distribution Signal B IGF Ignition Failure Confirmation Signal IGSW Ignition Switch IGT Ignition Timing Signal SYMBOL MEANIN G ISC1 Idle Speed Control Signal No 1 ISC2 Idle Speed Control Signal No 2 ISC3 Idle Speed Control Signal No 3 ISC4 Idle Speed Control Signal No 4 KD Kick Down KNK Knock Sensor KS Karman Signa l L7 Throttle...

Page 9: ...mo Wate r TR Traction Contro l T VIS Toyota Variable Induction System TSW Water Temperature Switch VAF Voltage Air Fuel Ratio Control VB Voltage Battery VC Voltage Constant VF Voltage Feedbac k VG Voltage Gram Intake Air V ISC VSV Type Idle Speed Control VS Voltage Slide Signa l VSH Voltage Sub Throttle Angle VTA Voltage Throttle Angle VTH Voltage Throttle Angl e W CHECK ENGINE Warning Lamp WIN Wa...

Page 10: ...b OW3W ...

Page 11: ...m which incorpo rates control systems controlled by various ECUs to ensure basic vehicle performance not only running turning and stopping At Toyota a computer which controls each type of system is called an ECU REFERENCE On some vehicle models the ECT has its own ECU called the ECT ECU The ECU for engine control is called the Engine ECU in this case On models in which the ECT does not have its ow...

Page 12: ...nostic fail safe and back up functions CYL ARR ENGINE MODELS 1980 1985 1990 199 5 K series 4K E E series 3E E 2E E 4E FE 5E FE A series 4A GE 4AG ZE 4A FE 5A FE 7A FE L4 S series 2S E 1 S i 1S E 2S E 13S FE 5S FE 3S GE 3S GTE R series 22R E 22R TE 22R E Y series 3Y E 4Y E RZ series 1RZ E 2RZ E 2RZ FE 3RZ FE1 TZ series 2TZ FE 2TZ FZE G series 1G E 1G FE 1G GE L6 M series 4M E 5M E 5M GE 5M GE 6M GE...

Page 13: ...airs are made and fail These functions are all controlled by the Engine safe and back up functions which operate when ECU any of these control systems malfunction Manifold pressure sensor Fuel pum p Knock sensor Distributor and igniter Water temp sensor E Ignition switch Circuit opening relay Engine EC U Variable resistor Check connector Idle speed control valve Intake air temp sensor Applicable o...

Page 14: ...e air temperature THA etc ESA ELECTRONIC SPARK ADVANCE The Engine ECU is programmed with data that will ensure optimal ignition timing under any and all operating conditions Based on this data and on data provided by the sensors that monitor various engine operating conditions such as those shown below the Engine ECU sends IGT ignition timing signals to the igniter to trigger the spark at precisel...

Page 15: ...isplays the malfunction by lighting the CHECK ENGINE lamp displaying on a tester or output ting a voltage signal OBD II scan tool or TOYOTA hand held teste r CHECK ENGINE lamp OHP 4 Sensors OHP 4 FAIL SAFE FUNCTIO N If the signals input to the Engine ECU are abnormal the Engine ECU switches to standard values stored in its internal memory to control the engine This makes it possible to control the...

Page 16: ...SO R VARIABLE RESISTOR 3 NEUTRAL START SWITC H TAILLIGHT DEFOGGER RELAY S AIR CONDITIONE R KNOCK SENSOR CHECK CONNECTOR OXYGEN SENSOR HEATER CONTRO L OXYGEN SENSOR HEATE R FUEL PUMP CONTRO L CIRCUIT OPENING RELAY CHECK ENGINE LAMP Diagnostic code display PIM 10 VS KS 20 or VG G NE THW THA ID L T A STA SP D OX VAF NSW ELS A C KN K TE TE IGT IGF ISC RSC ENGINE IRSO I ECU H T FC W BATT I 1 13 BATTERY...

Page 17: ...ening angle Ignition switch STA Senses when ignition switch is start position Vehicle speed sensor SPD Senses vehicle speed Oxygen sensor OX Senses oxygen density in exhaust gas 02 sensor It is used to change the air fuel ratio of the idl e Variable resistor VAF mixture Senses whether transmission is in P or N Neutral start switch NSW or in some other gear Taillight defogger relays ELS Senses elec...

Page 18: ...o r J Combination meter Fuel tank Air conditioner amplifier i f Engine EC U Distributor and igniter Knock sensor Variable resistor Oxygen sensor 02 sensor r Water temp sensor Battery TWC Applicable only to General Country specification vehicles without oxygen sensor COROLLA 4A FE ENGINE FOR EUROPE Apr 1992 Taillight relay Defogger relay r o Ignition switch CHECK ENGINE lamp 12 ...

Page 19: ...ls covered in Step 2 vol 5 EFI are covered in outline form only in this manual If there is a circle in the STEP 2 EFI column in the following table refer to the Step 2 vol 5 EFI for a detailed explanation of the relevant sensors and their signals SENSORS SIGNALS PAGE THIS MANUAL ITEM REMARK APPENDIX STEP 2 EFI Engine without steppe r motor type ISC valve 15 0 Power circuitry Engine with steppe r m...

Page 20: ... Kick down switch 42 Water temperature switch 42 Clutch switch 42 Knock sensor 43 With knocking correction for ES A HAC high altitude compensation sensor 44 Turbocharging pressure sensor 44 Stop lamp switch 45 Oil pressure switch 45 Throttle opening angle 45 signals Throttle opening angl e signals for TRC traction 4 5 control syste m Cruise control system 4 6 communications signa l TRC system 4 6 ...

Page 21: ...NE WITHOUT STEPPER MOTOR TYPE ISC VALV E The following diagrams show the type in which the EFI main relay is operated directly from the ignition switch When the ignition switch is turned on current flows to the coil of the EFI main relay causing the contacts to close This supplies power to the B and B1 terminals of the Engine ECU Battery voltage is supplied at all times to the BATT terminal of the...

Page 22: ...d when the ignition switch is turned off ELECTRICAL CIRCUITR Y EFI fus e Battery Engine ECU ELECTRICAL CIRCUITRY Engine ECU Some models only OHP 8 1 Outputs 5 V from the 5 V constant voltage circuit 2 Outputs 5 V from the 5 V constant voltag e circuit through a resistor NOTE When the VC circuit is open or shorted each of the sensors using the 5 V constant voltage of the VC is no longer activated I...

Page 23: ...n accordance with the degree of deformation This fluctuation in the resistance value is converted to a voltage signal by the IC built into the sensor and is then sent to the Engine ECU from the PIM terminal as an intake manifold pressure signal The VC terminal of the Engine ECU supplies a constant 5 volts as a power source for the IC V 4 rn 3 OHP 9 f Intake manifold pressure OPERATION AND FUNCTION...

Page 24: ...volume In L type EFI this is one of the most important sensors The intake air volume signal is used t o calculate the basic injection duration ignition advance angle The following three types of air flow used Vane type Volume air flow F meter and basic meter are L Optical Karman vortex type Mass air flow _ Hot wire type meter Perfect Atmospheric vacuum pressure p 101 3 200 kPa 0 0 760 29 9 1500 59...

Page 25: ...just the volume of intake air which bypasses the measuring plate and can be used to adjust the idle mixture Some engines are equipped with air flow meters which are sealed with an aluminum plug REFERENCE Standard Adjustment Mark of Idle Mixture Adjusting Scre w As shown in the illustration a two digit number is stamped on the air flow meter near the idle mixture adjusting screw This number indicat...

Page 26: ...P 12 f2 Type 2 This type of air flow meter is supplied with ba ttery voltage from the VB terminal This type of air flow meter does not have a constant voltage 5 V supplied from the Engine ECU so the voltage determined by the ratio of the resistances of the resistor between VB and VC and the resistor between VC and E2 is input to the Engine ECU via the VC terminal As a result even when the VS volta...

Page 27: ...quency f of the Karman vortex thus generated the velocity of the air V and the diameter of the pillar d have the following relationship f K x d of a piece of thin metal foil called a mirror to the pressure of the vortexes and optically detecting the vibrations of the mirror by means of a photocoupler an LED combined with a phototransistor LED r Phototransisto r Vortex generato r The intake air vol...

Page 28: ...ow meter as shown below is used on some models OPERATION AND FUNCTION Current flows to the hot wire heater causing it to be heated When air flows through the wire the hot wire is cooled corresponding to the intake air mass By controlling the current flowing to the hot wire in order to keep the hot wire temperature constant that current becomes proportional to in take air mass Intake air mass can t...

Page 29: ...even if intake air temperature changes it is not necessary for the Engine ECU to correct the fuel injection duration for the intake air temperature In addition when air density decreases at high altitudes the cooling capacity of the air decreases in comparison with the same intake air volume at sea level As a result the amount of cooling of the hot wire is reduced Since the intake air mass detecte...

Page 30: ...e Linear type 1 ON OFF TYPE This type of throttle position sensor detects whether the engine is idling or running under a heavy load by means of the idle IDL contact or power PSW contact Other terminals or contacts can also be used to perform other functions depending on the type of engine These include the lean burn switch LSW contact for lean burn correction the L1 L2 and L3 terminals for contro...

Page 31: ... is closed completely the contact for the IDL signal connects the IDL and E2 terminals The VTA and IDL output signals are as shown in the table below Slider contact for VTA signal OHP 1 5 V 5 12 fi Idling Closed Throttle valve Open OHP 15 ELECTRICAL CIRCUITRY OHP 1 5 Depending on the model this circuitry may include both resistors Ri and R2 Ri only or R2 only NOTE Recent linear type throttle posit...

Page 32: ...eth on the rotor and the number of pickup coils differ depending on the engine Below we will explain the construction and operation of the G and NE signal generators that use a single pickup coil and a 4 tooth rotor for the G signal and a single pickup coil and 24 tooth rotor for the NE signal G SIGNAL The G signal informs the Engine ECU of the standard crankshaft angle which is used to determine ...

Page 33: ...ion of the distributor shaft generating the waveforms shown in the chart From these signals the Engine ECU detects the engine speed as well as each 30 change in the engine crankshaft angle NE signal timing rotor OHP 1 6 NE signal 1 2 turn of timing rotor ELECTRICAL CIRCUITRY AND G AND NE SIGNAL WAVEFORMS 1 G signal 1 pickup coil 4 teeth NE signal 1 pickup coil 24 teeth Engine ECU NE signal OHP 17 ...

Page 34: ...l 4 teeth Engine ECU OHP 19 G signa l NE signa l NE signal IVU U U 180 CA OHP 18 4 NE signal 1 pickup coil 4 teeth Engine ECU M1 Igniter a 1 OHP 18 NE signal 180 CA OHP 18 1800 6 NE signal 2 pickup coils 4 teeth Engine EC U NE signal 180 CA 720 CA OHP 1 9 OHP 1 9 OHP 1 9 This type of circuit has two NE pickup coils connected in series This is for the purpose of preventing noise in the NE signal du...

Page 35: ...cuit also has two NE pickup coils for the same purpose as the circuit in on the previous page NOTE Depending on the engine model there are also some Engine ECUs in which the G terminal is grounded through a diode When the diode is included in the circuit a reading of approximately 0 7 V is obtained when measuring the voltage between G an d El Engine ECU OHP 20 NE signal timing rotor NE pickup coil...

Page 36: ...ndard crankshaft angle which is used to determine the injection timing and ignition timing in relation to compression TDC of cylinder No 6 The G2 signal conveys the same information for cylinder No 1 The sensors that generate these signals consist of a signal plate which is fixed to the camshaft timing pulley and turns once per every two rotations of the crankshaft and a pickup coil for the G sign...

Page 37: ...re generated in the NE pickup coil by NE signal 1 pickup coil 12 teeth the NE signal plate like the G signals The only difference is that the signal plate for the NE signal has 12 teeth instead of just one Therefore 12 NE signals are generated per each engine revolution From these signals the Engine ECU detects the engine speed as well as each 30 change in the crankshaft angle Engine ECU OHP 23 NE...

Page 38: ...y Bosch uses G signal generator of the hall element type Holl element will generate electromotive force in proportion to the changes of the magnetic flux I G signa l NE signal YYVV W Y 720 C A 360 C A V _I L I L 10 CA 30 CA 7 VVVYYVYYVVYVVY YtlYYVVVYYVYYYVVVYVYYYVYVYVYtlYYYY YVVVVYtlVVYVVY NOTE The G signal timing rotor of the above described type in Z is integrated into a single unit with the cam...

Page 39: ...ture of the means of an internal thermistor intake air by means of an internal thermistor Thermistor OHP 24 4 For L type EFI vane type 20 0 20 40 60 80 100 120 4 32 68 104 140 176 212 248 Temperature C F OHP 2 4 ELECTRICAL CIRCUITRY Engine ECU Thermistor 1 For D type EFI optical Karman vortex type Air flow meter Water temperature sensor intake air temperature sensor OHP 24 OHP 25 Intake air temp s...

Page 40: ...etric air fuel ratio The oxygen sensor senses whether the air fuel ratio is richer or leaner than the theoretical air fuel ratio It is located in the exhaust manifold in the front exhaust pipe etc This differs depending on the engine model The following types of oxygen sensor are used they differ mainly in the material used for the element Zirconia element type Titania element typ e 1 ZIRCONIA ELE...

Page 41: ...ormal if the out side of the oxygen sensor is contaminated with mud etc it could prevent outside air from get ting into the oxygen sensor The difference bet ween the oxygen concentrations in the outside air and the exhaust gas will fall so the oxygen sensor will always be sending a lean signal to the ECU ELECTRICAL CIRCUITRY Engine ECU Oxygen sensor OHP 26 m M No air Much air o into int o exhaustg...

Page 42: ...uilt into the laminated substrate to keep the temperature of the element constant x T Theoretical 8i air fuel rati o U V No air into exhaust gass Much air int o exhaustgass Richer a Air fuel c Leaner no air ratio much air OHP 27 This sensor is connected to the Engine ECU as shown in the following circuit diagram A 1V potential is supplied at all times to the OX i terminal by the Engine ECU The Eng...

Page 43: ... is lean on the other hand there will be a lot of oxygen in the exhaust gas and the amount of current flowing through the zirconia element will be large as shown in the following graph The lean mixture sensor has been adopted to assure that the air fuel ratio is kept within a predetermined range thereby improving fuel economy as well as drivability This sensor also comes with a heater to heat the ...

Page 44: ...ties shown in the figure below The magnetic force at the four areas of transition between the N and S poles of the magnet opens and closes the contacts of the reed switch as the magnet rotates Q To speedometer cabl e OHP 29 ELECTRICAL CIRCUITRY Engine ECU 2 PHOTOCOUPLER TYPE This sensor is mounted in the combination meter It includes a photocoupler made from an LED which is aimed at a phototransis...

Page 45: ...30 V OHP 30 0 V ELECTRICAL CIRCUITRY OHP 30 Engine ECU OHP 30 OPERATION When the transmission output shaft rotates the distance between the core of the coil and the rotor increases and decreases because of the teeth The number of lines of magnetic force passing through the core increases or decreases accordingly and AC alternating current voltage is generated in the coil Since the frequency of thi...

Page 46: ...ency of the waveform is in accordance with the number of poles of the magnet fitted to the magnetic ring There are two types of magnetic ring depending on the vehicle model the type with twenty magnetic poles and the type with four magnetic poles The 20 pole type generates a 20 cycle waveform i e twenty pulses for each rotation of the magnetic ring while the 4 pole type generates a 4 cycle wavefor...

Page 47: ...lects either of the two input voltages as the reference voltage and then compares the reference voltage with the other input voltage to judge which is larger or smaller If input voltage B is taken as the reference voltage in the example circuit shown below the relationship between the input and the output becomes as follows Output OHP 32 INPUT OUTPUT A B Hi 1 A B Lo 0 OHP 32 The speed sensor uses ...

Page 48: ...g the ISC system ELECTRICAL CIRCUITRY Engine ECU OHP 34 REFERENCE 1 The Engine ECU judges whether the engine is cranking based on the STA signal There are also engines which use the NE signal to judge the engine running conditions during starting 2 In some engine models if the STA signal is input while the engine is running it could result in the engine stalling 1 When the ignition switch is in th...

Page 49: ...CU ELECTRICAL LOAD SIGNAL 1 This signal detects when the head lamps rear window defogger etc are on Depending on the vehicle model the circuitry for this signal can have a number of electrical load signals which are brought together and input into the Engine ECU as a single signal as shown in the following electrical circuit or it can have each signal input to the Engine ECU separately This signal...

Page 50: ... the water temperature sensor or intake air temperature sensor The signals from this sensor are used in the diagnostic system When this sensor detects EGR gas temperatures below a predetermined level during EGR system operation the Engine ECU judges that the EGR system is malfunctioning and lights the CHECK ENGINE lamp to inform the driver ELECTRICAL CIRCUITRY Engine ECU OHP 35 I NOTE Fuel Control...

Page 51: ... Engine ECU OHP 35 NOTE It is usually not necessa ry to adjust the idle mixture in most models provided that the vehicle is in good condition However if it does become necessary to do so always use a CO meter If a CO meter is not available it is best not to attempt to adjust the idle mixture if at all possible 1 1 In the vane type air flow meter the idle mix ture can be adjusted by turning the idl...

Page 52: ...ut off control KD signal is used for power enrichment system in order to lower the fuel combustion This switch is also called the full throttle switch in other manuals temperature ELECTRICAL CIRCUITRY Engine ECU Accelerato r e pedal Kick down switch OHP 3 6 ACCELE Kick down RATOR switch PEDAL r Accelerato r ITEM peda l THROTTLE Fully Fully Fully VALVE closed opened opened KICK DOWN SWITCH Off Off ...

Page 53: ... engine knocks at a frequency of approximately 7 kHz the voltage output by the knock sensor is at its highest level at about that frequency There are two types of knock sensor One type generates high voltages over a narrow range of vibration frequencies while the other type generates high voltages over a wide range of vibration frequencies OHP 37 REFERENCE The Engine ECU judges whether the engine ...

Page 54: ...io ELECTRICAL CIRCUITR Y type with sensor mounted separately HAC sensor Engine ECU TURBOCHARGING PRESSURE SENSO R The turbocharging pressure sensor senses the turbocharging pressure intake manifold pressure Its construction and operation are the same as those of the manifold pressure sensor See page 17 If the turbocharging pressure becomes abnormally high the Engine ECU cuts off the supply of fuel...

Page 55: ... signal is used mainly in controlling the ISC system ELECTRICAL CIRCUITRY COMMUNICATIONS SIGNALS Communications signals are signals that are sent between different ECUs to make it possible for them to coordinate their operations These communications signals are explained below 1 THROTTLE OPENING ANGLE SIGNAL S The throttle opening angle VTA signal from the throttle position sensor is processed by ...

Page 56: ...lated to traction control such as retarding the ignition timing ELECTRICAL CIRCUITR Y TRC ECU Engine ECU OHP 40 5 ABS ANTI LOCK BRAKE SYSTEM COMMUNICATIONS SIGNA L This signal detects when the ABS system is operating It is used in fuel cut off control to reduce the effectiveness of engine braking as necessary ELECTRICAL CIRCUITR Y ABS ECU Engine ECU OHP 40 6 INTERCOOLER SYSTEM WARNING SIGNAL When ...

Page 57: ...ric motor 8 ENGINE SPEED SIGNAL This is the NE signal which is input to the Engine ECU then undergoes waveform shaping and is output to the TRC ECU etc ELECTRICAL CIRCUITR Y TRC ECU Engine ECU OHP 41 9 ENGINE IMMOBILISER SYSTEM COM MUNICATIONS SIGNA L The Engine ECU generates a rolling code based on certain parameters and sends it to the Transponder Key ECU IMO terminal Upon receiving the rolling ...

Page 58: ...rminal of DLC1 or TE2 or TE1 terminal of DLC2 In addition in case of reading diagnostic codes the tester for exclusive use must be connected to DLC3 For further details see page 137 2 OBD II scan tool or TOYOTA hand hel d tester TDCL OHP 4 1 When these terminals are connected with the E1 terminal diagnostic codes for either the normal mode or the test mode can be read from the blinking of the CHEC...

Page 59: ...m D type EFI from the manifold pressure sensor fuel injection duration for each engine condition or the intake air volume signal in L type EFI based on signals from various other sensors from the air flow meter and 2 the engine speed Air cleaner Pressure regulato r Manifold pressure senso r Engine EC U Engine speed Sensors Fuel filter Fuel tank with built in fuel pump OHP 42 BASIC CONSTRUCTION OF ...

Page 60: ...l type ypes o L type EFI air flow control 52 type Fuel In tank type 54 0 pump In line type 54 On off control by ECU 55 J On off control by fuel pump 56 switch Fuel pump By engine EC U control On off with fuel pump 5 7 control control relay an d with resisto r speed By engine EC U control with fuel pump 57 EC U Fuel filter 58 0 E Pulsation damper 58 Pressure Normal type 58 0 regulator Pressure up c...

Page 61: ...hment 73 Power enrichment 74 0 Air fuel Acceleratio n o ratio enrichment 74 0 C correction correction 0 during Deceleration 74 c transition lean correctio n 0 After Air fuel Oxygen sensor 75 With TW C start 3 ration 0 injection feedback Lean mixture 7 5 o control correction senso r CO emission control 76 Except with oxyge n correction senso r Idling stability 77 0 LL correctio n High altitude com ...

Page 62: ... 1 I F i Detection of intake manifold pressure ENGIN E Engine speed I Fuel AIR FLOW METE R INTAKE MANIFOL D ENGIN E Engine spee d ENGINE ECU Injectio n INJECTOR Injection volume Fuel control OHP 43 Vane type ENGINE ECU Injection volume control OHP 43 MANIFOLD PRESSURE SENSOR OHP 43 2 L TYPE EFI AIR FLOW CONTROL TYPE This type directly senses the amount of air flowing into the intake manifold by me...

Page 63: ...ected in front of the intake ports near the cylinders This is the method used in most EFI engines Xb Solenoid resistor except in the case of the single point injector for the 1S i engine and the amount of fuel injected is controlled by the length of time current is sent to the injectors A single cold start injector is also mounted in the intake chamber to improve startability in cold weather This ...

Page 64: ...uel tank This type is no longer in use at Toyota This type produces much less pulsation and noise the in line type Currently only this type is used in Toyota vehicles OHP 45 Motor Silencer Diaphragm chambe r Check valve Brush Armature Magne t Pump space r Relief valv e Filter Mj5LX TER A 00 Roto r OHP 45 Outlet Inlet t it Casing Impeller Blade OHP 45 OHP 45 54 ...

Page 65: ...ery The starter operates next and the engine begins to crank at which point the Engine ECU receives an NE signal This signal causes the transistor inside the Engine ECU to go on and current therefore flows to the L2 coil of the circuit opening relay 2 Engine started After the engine sta rts and the ignition switch is returned from the START position ST terminal to the ON position IG terminal curre...

Page 66: ...he Lz coil of the circuit opening relay 2 Engine sta rted After the engine sta rts and the ignition switch is turned from START back to ON current flowing volume fuel pumps controlled by fuel pump switch They also serve to prevent sparks from being generated at the relay contacts On some recent models an L3 coil is not provided in the circuit opening relay to the La coil of the circuit opening rel...

Page 67: ...erating at high speeds or under heavy loads the Engine ECU turns off the fuel pump control relay The point of this relay con tacts contact A and the current to the fuel pump flows directly to the pump without passing through the resistor causing the fuel pump to run at high speed The fuel pump also runs at high speed while the engine is starting Fuel pump control rela y Engine ECU Fuel FP pump Hig...

Page 68: ...TOR The pressure regulator regulates the fuel pressure to the injectors in accordance with the intake manifold pressure 4 To fuel return hos e PRESSURE UP CONTROL SYSTEM OHP 48 In some engines the fuel pressure is increased by the Engine ECU when the temperature of the coolant or ambient temperature of the engine is too high during engine cranking The Engine ECU causes more air to be drawn into th...

Page 69: ... some recent models intake manifold pressure is not connected to the pressure regulator Fuel pressure is always maintained at a con stant pressure higher than the atmospheric pressure As a result changes in injection volume caused by intake manifold pressure are corrected by the Engine ECU VSV on OHP 48 2 In addition to the models described in 1 above there are also models in which the pressure re...

Page 70: ...ance injector is used a solenoid resistor is connected between the ignition switch and the injectors The electrical circuitry for simultaneous injection See page 66 is shown below Ignition switch Current control Low resistance injectors No longer in use VOLTAGE CONTROL METHOD FOR HIGH RESISTANCE INJECTOR S Battery voltage is applied to the injectors directly via the ignition switch When the transi...

Page 71: ...rent pulling in the injector plunger is approximately 8 A while it is about 2 A while the plunger is being held in Tr2 absorbs counter electromotive force from the injector solenoid coil while Tri is being switched on and off thus preventing sudden reductions in current If an extremely large current flows to the injectors for any reason the fail safe main relay goes off cutting off the flow of cur...

Page 72: ...l the maximum injection duration of the is cold This injector operates only during cold start injector cranking when the coolant temperature is low Inlet Plunger Bi metal element OHP 50 NOTE On many current engine models the cold start system has been discontinued Instead star ting injection control which is under the con trol of the Engine ECU controls the injection of fuel during starting Heat c...

Page 73: ...also by the Engine ECU in accordance with the coolant temperature Control of the injection duration of the cold start injector continues to be carried out by the start injector time switch as shown by shaded area A in the figure below but control is also exercised by the Engine ECU as shown by shaded area B in the figure Engine ECU STA STA OHP 5 1 I 20 0 20 40 60 4 32 68 104 140 Coolant temperatur...

Page 74: ...W METER L type EFI THROTTLE BODY AIR VALVE and or ISC VALVE Air cleane r N When the coolant temperature is low the air valve opens and air passes through it in addition to passing through the throttle body as usual and enters the air intake chamber This extra air raises the idle speed to aid in engine warm up In engines equipped with some types of ISC valves the above is performed not by an air va...

Page 75: ...lve the volume of air flowing through the bypass passage is controlled by the ISC valve Therefore in some engines the idle speed adjusting screw is set to the fully closed position at the factory while in others an idle adjusting screw is not provided 2 AIR VALVE The air valve controls the engine idling speed when the engine is cold Some engines equipped with an ISC valve do not use this air valve...

Page 76: ... the method in which the cylinders are arranged into several groups and fuel is injected into groups of cylinders in sequence and the method in which fuel is injected into each cylinder separately Fuel injection timing can also differ depending on the engine model with some engines being started at all times with a predetermined timing and other engines being started with an injection timing calcu...

Page 77: ... 1080 Crankshaft angle OHP 54 mixture sensor FOR 1S i Intake stroke i Ignition Fuel injectio n 1 t 3 4 2 t S i 0 360 720 1080 Crankshaft angle OHP 5 4 1 Applicable engines were manufactured in September 1991 Refer to the respective engine Repair Manuals or Electrical Wiring Diagrams for later changes and addi tions 2 The fuel injection volume in the 3F E engine is controlled separately for the fro...

Page 78: ...oltage correctio n Basic injection duration control Injection corrections Voltage correctio n REFERENC E Fuel injection duration control consists of syn chronous injection in which injection is per formed at a predetermined crankshaft angle as described above as well as asynchronous injec tion in which injection is performed irrespective of the crankshaft angle Asynchronous injection consists of s...

Page 79: ...FI 0 0 duration control For L type EFI 0 11 0 Intake air temp correction 0 After start enrichment 0 0 Warm up enrichment 0 Power enrichment 0 0 0 0 Acceleratio n Air fuel ratio enrichment 0 0 0 0 0 0 correction correctio n during Deceleratio n transition lean 0 0 0 0 0 0 After sta rt correctio n injection control Air fuel Oxygen 0 42 ratio senso r feedback Lean mixture 0 correction senso r CO emis...

Page 80: ...intake air temperature correc tion See page 72 and a voltage correction See page 79 to obtain the actual injection duration When the weather is cold the cold start injection system operates in order to improve startability See page 63 Basic injection duration during sta rting THW OHP 55 Injection signal during starting Low On some models injection duration increases a s N E Intake air temperature ...

Page 81: ... by the manifold pressure PIM signal and the engine speed NE signal The internal memory of the Engine ECU contains data on various basic injection durations for various manifold pressures and engine speeds RELEVANT SIGNALS Intake manifold pressure PIM Engine speed NE REFERENCE Since the intake efficiency varies depending on the valve clearance the intake air volume may vary even if the intake mani...

Page 82: ...re For this reason the Engine ECU must be kept accurately informed of the intake air temperature by means of the intake air temperature sensor so that it can adjust the injection duration to maintain the air fuel ratio that is currently required by the engine For this purpose the ECU considers 20 C 68 F to be the standard temperature and increases or decreases the amount of fuel injected depending...

Page 83: ...e engine models the starter STA signal is used as a condition for beginning this correction WARM UP ENRICHMENT Since fuel vaporization is poor when the engine is cold the engine will run poorly if a richer fuel mixture is not supplied For this reason when the coolant temperature is low the water temperature sensor so informs the Engine ECU which increases the amount of fuel injected to compensate ...

Page 84: ... prevent the engine from overheating 3 In some engine models the kick down switch KD signal is used as a condition for begining this correction AIR FUEL RATIO CORRECTION DURING TRANSITION S A transition is the moment when the engine rpm changes either during acceleration or deceleration During a transition the injection volume must be increased or decreased to assure proper engine pe rformance a A...

Page 85: ...gen sensor with a predetermined voltage If the voltage of a signal is higher than that voltage it judges the air fuel ratio to be richer than the theoretical air fuel ratio and reduces at a constant rate the amount of fuel injected If the voltage of a signal is lower it judges that the air fuel ratio is leaner than the theoretical air fuel ratio and increases the amount of fuel injected The correc...

Page 86: ...ichment During power enrichment When the coolant temperature is below a predetermined leve l When fuel cut off occurs tion is referred to as air fuel ratio learned con trol and the value remembered by the Engine ECU is referred to as the learned value As a result of this learned control air fuel feed back correction is constantly able to correct the central value of the correction ratio with a val...

Page 87: ...ION D type EFI and L type EFI z The injection volume can be adjusted by manually adjusting the variable resistor See page 41 This can be used to adjust the volume of CO emissions RELEVANT SIGNALS Variable resistor VAF Engine speed NE NOTICE It is usually not necessary to adjust the idle mixture in most models provided that the vehicle is in good condition However if it does become necessa ry to do...

Page 88: ...tions as at sea level the air fuel mixture would become richer For this reason the ECU corrects the fuel injection volume based on signals from the high altitude compensation sensor and the air flow m ete r This correction decreases the injection volume by about 10 at 1000 meters above sea level for example 101 3 kPa 760 29 9 mmHg in Hg low altitude Atmospheric pressure Low altitude OHP 58 RELEVAN...

Page 89: ...hicle speed SPD IYV I C The Engine ECU also performs various other corrections in addition to these page 72 to 79 3 Voltage correction There is a slight delay between the time that the Engine ECU sends an injection signal to the injectors and the time that the injectors actually open This delay becomes longer the more the voltage of the battery drops This means that the length of time that the inj...

Page 90: ...l 6 L OW3W ...

Page 91: ...vernor advancer in distributor Furthermore ignition must also be advanced when the manifold pressure is low i e when there is a strong vacuum In conventional EFI this is achieved by the vacuum advancer in the distributor However optimal ignition timing is also affected by a number of other factors besides engine speed and intake air volume such as the shape of the combustion chamber the temperatur...

Page 92: ... r OHP 59 In some engine models two ignition timing advance patterns according to the fuel octane rating premium or regular are stored in the ECU The ignition timing can be changed to match the gasoline being used premium or regular by operating the fuel control switch or connector See page 40 In some engine models this is done automatically by the Engine ECU s fuel octane judgement fun ction See ...

Page 93: ... ignition confirmationl signal 84 0 Conventional ignition circuitry 85 0 for TCCS Ignition i i DLI distributorless ignition 86 rcu try c system DIS direct ignition system 88 Starting ignition control 91 Basic ignition advance angle 9 2 Warm up correction 93 0 Over temperature correction 9 3 Stable idling correction 94 0 EGR correction 94 0 With EGR 0 Air fuel ratio feedback 95 With oxygen sensor w...

Page 94: ...E ESA Crankshaft Angle Initial Ignition Timing Angle Judgement IGT Signa l 50 7 or 100 BTDC Ignitio n r A i I J IGT IGNITION TIMING SIGNAL IGT J IGT with initial ignition timing IGT with timing advanced OHP 60 The Engine ECU sends an IGT signal to the igniter based on signals from each sensor so as to achieve the optimal ignition timing This IGT signal goes on just before the ignition timing calcu...

Page 95: ...gna l Ignition coi l Ignition switch Battery IGF signal II generation circui t 0 a IGT 2 Ignition r rnntrnl circuit II h I I N I OHP 6 1 NOTE In some recent models the IGF signal is generated according to the primary current value In these models IGF is switched on when IGT is on and IGF is switched off when the primary current exceeds the predetermined value FOR RECENT MODEL S ON IGT OF F Primary...

Page 96: ...ed In this section we will explain the operation of both the conventional ignition system used in TCCS and the DLI and DIS For an explanation of the operation of the ignition system for the con ventional EFI refer to Step 2 vol 3 Ignition System REFERENCE An igniter is included in the Engine ECU of the 4A FE engine made by Bosch 1 CONVENTIONAL IGNITION CIRCUITRY FOR TCC S The microprocessor in the...

Page 97: ...ming by which the IGT signal is switched on when engine speed increases IGF SIGNAL GENERATION CIRCUIT This circuit generates the IGF signal and sends it to the ECU LOCK UP PREVENTION CIRCUIT This circuit forces Tr2 to go off if it locks up that is if current flows continuously for a period longer than a predetermined period in order to protect the ignition coil and Tr2 OVER VOLTAGE PREVENTION CIRC...

Page 98: ...the DLI the igniter is connected to the Engine ECU as shown in the figure above There are three ignition coils one for cylinders No 1 and No 6 one for cylinders No 2 and No 5 and one for cylinders No 3 and No 4 The ECU sends cylinder identification signals IGDA and IGDB and the IGT signal to the igniter in accordance with the G 1 G2 and NE signals from the cam posi Igniter tion sensor which detect...

Page 99: ...gnal to the transistor drive circuit that is connected to the relevant ignition coil based on the combination of these signals Switching of the IGDA and IGDB signals from 1 to 0 and from 0 to 1 is synchronized with the IGT signal Other circuits are the same as those in the igniter for the conventional type 3600 CA 720 CA G1 G2 No 1 BTDC 10 compression 0 SIGNALS CYLINDERS IGDA IGDB No 1 and No 6 0 ...

Page 100: ...ECU Constant voltage circuit Ignition switch Battery I ii Spark Ignition plugs coils U U a G T GT IGT z GT o Lock prevention circui t Constan current control circuit Dwell angle control Circui t Ignition delecting circuit F I TACH lGF signal outpu circuit O TACH 2JZ GTE ENGINE May 1993 Control by the Engine ECU is basically the sam e as that of an ordinary ESA The difference is tha t the Engine EC...

Page 101: ... ignition control each type of correction differs depending on the engine model Ignition timing control Starting ignition control Initial ignition timing angl e Initial ignition timing angle Basic ignition advance angl e After sta rt ignition control After start ignition contro l Various corrections are added to the initial ignition timing angle and the basic ignition advance angle during normal o...

Page 102: ...z _J z z a OW D H O Q Za Z 0 j u O IGNITION TIMING CONTROL Y O Q F m a _J C7 Z CL a Z O V O 0 Starting ignition control 0 0 Basic ignition advance angle 0 0 0 0 0 C Warm up correction 0 0 0 Over temperature correction 0 M C Stable idling correction 0 0 0 0 Y E EGR correction 0 0 0 0 0 t m _ Air fuel ratio feedback correction 0 0 0 m Knocking correction 0 r o o U c Torque control correction 0 0 0 0...

Page 103: ...ngine speed NE REFERENCE In some engine models the starter STA signal is also used to inform the ECU that the engine is being cranked Engine EC U NE Initial ignition timing angle l signal generation circuit 11 AFTER START IGNITION CONTRO L After start ignition control is carried out during normal operation The various corrections which are based on signals from the relevant sensors are added to th...

Page 104: ...are also models in which the advance angle is 0 at the time of the stan dard idle speed 1 i IDLE CONTACT OPEN OFF The Engine ECU determines the basic ignition advance angle based on data stored in its memory and based on the intake manifold pressure or the intake air volume and engine speed In some engine models two types of basic ignition advance angle data are stored in memory One or the other o...

Page 105: ...xtremely high The ignition timing angle is retarded a maximum of approximately 5 by this correction 0 5 110 230 Coolant temperature C F Depending on the engine models 60 140 Coolant temperature C F Depending on the engine models OHP 66 RELEVANT SIGNAL S Coolant temperature THW Intake manifold pressure PIM or intake air volume VS KS or VG REFERENCE In some engine models the throttle position IDL si...

Page 106: ...his correction This correction is not executed when the engine exceeds a predetermined speed O f_ Difference from target idle speed OHP 66 RELEVANT SIGNALS Engine speed NE Throttle position IDL Vehicle speed SPD REFERENCE 1 In some engine models the advance angl e changes depending on whether the air conditioner is on or off 2 In some engine models this correction only operates when the engine spe...

Page 107: ...to r Spark plug Igniter coi l Sensor Engine ECU w Engine knocking correction circuitry OHP 6 7 The ECU judges whether the strength of the knocking is at one of three levels strong medium or weak according to the strength of the KNK signals and changes the corrective ignition retard angle accordingly In other words if the knocking is strong the ignition timing is retarded a lot while if knocking is...

Page 108: ... to some extent during shifting In some models this shock is minimized by delaying the ignition timing when gears are up or down shifted When gear shifting starts the Engine ECU retards the engine ignition timing to reduce the engine torque As a result the shock of engagement of the clutches and brakes of the planetary gear unit is reduced and the gear shift change is performed smoothly The igniti...

Page 109: ...the coolant temperature is above a predetermined temperature and the traction control system is operating d ACIS Acoustic Control Induction System Correction When the engine speed rises above a predetermined level the ACIS operates At that time the Engine ECU advances the ignition timing simultaneously thus improving output See page 120 for details on the ACIS e Intercooler Failure Correctio n Thi...

Page 110: ...e the standard ignition timing signal to be output from the back up IC in the same way as during after start ignition control See page 91 Check connector TorTE1 El TDCL OHP 68 SST El TE1 OHP 68 The standard ignition timing differs depending on the engine model as shown in the following table When tuning up the engine refer to the repair manual for the relevant engine FIXED ENGINE INITIAL IGNITION ...

Page 111: ...alve type Air cleaner Iri Ignition switch Battery I i Engine ECU Sensors BASIC CONSTRUCTION OF ISC The control functions in the ISC system differ depending on the engine The power steering idle up mechanism is controlled by a separate idle up device see Step 2 vol 11 Steering System for more details Since the volume of air passed through the duty control ACV type ISC valve and the on off control V...

Page 112: ...p 10 5 After start control 10 6 Warm up fast idle control 106 Stepper Feedback control 107 motor typ e ISC valve Engine speed change 107 estimate contro l Electrical load idle up 107 control Other controls 10 7 Starting control 108 Warm up fast idle 108 o Rotary control solenoid Feedback control 108 L 7 type IS C valve Engine speed change 109 estimate control Other controls 109 Starting control 11...

Page 113: ... the valve and valve seat regulating the amount of air that is allowed to pass through The ISC valve has 125 steps from the fully closed to the fully open position Since the air flow capacity of the stepper motor type ISC valve is large it is also used for controlling fast idle It is not necessary to use it in combination with an air valve Rotor Stator To air intake chamber Valve seat Valve shaf t...

Page 114: ...ls become excited Since the N poles tend to be attracted to the S poles in the stator and rotor and since like poles in the stator and rotor tend to repel each other the rotor rotates one step Stato r Rotor V _C _ Stato r Rotor 102 N 1 I N S s S 1 1 S N N S N N 1 32 revolution s _L Repulsion t Attraction S S N S OHP 71 2 ROTARY SOLENOID TYPE The ISC valve is mounted on the throttle body and intake...

Page 115: ...nt magnet when the ECU generates a duty signal The ECU thus causes the permanent magnet to rotate controlling the magnetic intensity of the field produced by the coils Bimetallic strip assembl y The bimetallic strip similar to the one found in a regular carburetor assembly detects changes in coolant temperature via the valve body The guard attached to one end of the bimetallic strip senses the pos...

Page 116: ...tween the solenoid valve and the valve body controlling the idle speed Note however that the fast idle speed is controlled using an air valve From air cleaner To air intake chambe r OHP 73 In actual operation current to the coil is switched on and off each 100 msec so the position of the solenoid valve is determined by the proportion of time that the signal is on as compared to the time it is off ...

Page 117: ...n the engine is stopped no NE signal to the ECU the ISC valve opens fully to the 125th step to improve sta rtability when the engine is resta rted Main Relay ISC Valve Set up Contro l The supply of power to the ECU and ISC valve must be continued for a few moments even after the ignition switch is turned off in order to allow the ISC valve to be set up fully opened for the next engine start up The...

Page 118: ... example if the coolant temperature is 20 C 68 F during starting the ISC valve will gradually close from the fully open position step 125 or point A to point B when engine speed reaches the predetermined level 125 A A B After start control 20 68 Coolant temperature C F RELEVANT SIGNALS Engine speed NE Coolant temperature THW Throttle position IDL Vehicle speed SPD OHP 75 WARM UP FAST IDLE CONTRO L...

Page 119: ... speed SPD Air conditioner A C ELECTRICAL LOAD IDLE UP CONTROL 20 80 68 176 A Coolant temperature C F OHP 75 Target speeds also differ depending on engine conditions such as whether the neutral start switch is on or off and whether the air conditioner switch is on or off NOTE Stepper motor type ISC valves also control idle up of the air conditioner RELEVANT SIGNALS Engine speed NE Throttle positio...

Page 120: ... engine idle speed matches the target idle speed the data for which are stored in the ECU F RELEVANT SIGNALS Coolant temperature THW Engine speed NE FEEDBACK CONTROL When all feedback control operating conditions have been established after the engine has started the ECU constantly compares the actual engine speed and the target idling speed stored in its memory The ECU sends control signals to th...

Page 121: ... the turbine from seizing up if the hydraulic pressure should drop too low to provide sufficient turbine lubrication when the idle speed returns to normal following high speed or high load operation It does this by causing the idle speed to drop gradually so that the oil pump will supply a sufficient amount of oil to the turbocharger 1 V V 1 C 1 When terminal T or TE1 of the check con nector or TD...

Page 122: ...cting the T or TE1 terminal to the El terminal of the check connector or TDCL causes the ECU to fix the ACV opening angle to a certain value regardless of engine operating conditions OHP 77 STARTING CONTROL To improve startability during cranking STA goes on causing the ACV to open fully RELEVANT SIGNA L Ignition starter switch STA FEEDBACK CONTRO L The ECU changes the duty ratio of the V ISC sign...

Page 123: ... contact on A T vehicles The light control switch is turned on The rear window defogger switch is turne d on The VSV stays off under this condition if check terminals T or TE1 is connected to El However if the light control switch or rear win dow defogger switch is turned on the VSV goes on OHP 78 b On to Of f When a predetermined period of time has elapsed after the engine has started When engine...

Page 124: ... the idle speed to the target level The ISC valve position when the target speed is reached is stored in back up memory and is used thereafter in idling This is known as learned control If all power to the Engine ECU is cut off due to the EFI fuse or STOP fuse being removed or a battery cable being disconnected the learned value stored in back up memory will be erased Therefore when the engine is ...

Page 125: ...ntrol system 11 4 Oxygen sensor heater control system 114 O Lean mixture sensor heater control system 11 4 Cut off control 115 L Air conditione r control system Magnetic clutc h relay control 11 5 EGR cut off control system 116 With EG R Fuel octane judgment 11 6 SCV swirl control valve system 11 7 ACIS acoustic control Type 1 120 induction system Type 2 122 T VIS Toyota variable induction system ...

Page 126: ... and the exhaust gas temperature is consequently low this heater is operated to maintain sensor efficiency However when the engine load and exhaust gas temperature increases greatly heater operation is stopped to prevent deterioration of the sensor Engine EC U Oxygen sensor Heater HT E01 and E02 J OHP 7 9 The OD cut off signal and 3rd gear cut off signal appear as follows V High voltag e Low volta...

Page 127: ...ermined length of time after the air conditioner switch is turned on During this time the Engine ECU opens the ISC valve to offset the drop in the engine speed due to the operation of the air conditioner compressor This prevents the idle speed from dropping This latter control function is called the air conditioner compressor delay control B This air conditioner control function differs from the p...

Page 128: ...Some recent models use stepper motor type EGR valves An EGR vacuum modulator and VSV are not provided in this system The Engine ECU controls EGR volume and cut off In addition when current is not applied to the EGR valve the valve is fully closed by the force of a return spring Exhaust gas FUEL OCTANE JUDGMEN T The Engine ECU in some engine models determines the octane rating of the gasoline being...

Page 129: ...sed When the engine is running under a light load or below a certain rpm this valve closes creating a powerful swirl This increases combustion efficiency thereby improving fuel economy Under a heavy load or over a certain rpm the valve opens increasing intake efficiency and thus improving engine output A swirl control valve is provided in the intake port of each cylinder Swirl control lin k Intake...

Page 130: ...closed by the Engine ECU via a VSV and an used to increase the intake efficiency of the air actuator supplied to the cylinders It does this in response This makes it possible to improve engine to changes in the throttle opening VTA signal performance at both low and high engine sent from the throttle position sensor and the speeds engine speed NE signal sent from the Throttle valve Air control val...

Page 131: ...ntrol valve closed VSV off Air control valve open Low VSV off Air control valve open VSV on Air control valve closed Engine speed High OHP 85 1 VSV turned on Closing air control valve has the same effect as lengthening the intake manifold OHP 85 2 VSV turned off Opening air control valve has the same effect as shortening the intake manifold open Air control valv e OHP 85 121 ...

Page 132: ...i n No 2 air intake chamber OHP 86 Po OHP 87 Cross section A A No 1 air intake chamber Air control valves Vacuum tan k P Fro m air cleaner Intak e manifold accordance with engine running conditions the same effect as lengthening or shortening the intake manifold as in Type 1 can be obtained Air control valves Combustion chamber VsV Actuator Engine ECU Engine spee d OHP 86 122 ...

Page 133: ...ow and medium speed ranges Throttle valve Air control No 1 air intake valve closed chamber 1 Z No 2 air a intake chamber OHP 87 2 High speed above set speed When the engine speed rises above the predetermined speed the ECU turns the VSV off and the atmospheric air acts directly upon the actuator Therefore the spring damper causes the actuator to open the air control valves fully By opening the air...

Page 134: ...ion valve This makes it possible to improve engine performance in the low speed range without sacrificing the high engine speed and output that are distinctive features of engines with four valves per cylinder VSV Intake manifold air intake chamber T VIS b The intake air control valves for all cylinders are constructed as one unit and are opened and closed together by an actuator c The improvement...

Page 135: ...d engine the gasoline octane rating speed The VSV is controlled with the duty ratio in some models Turbocharger OPERATION The VSV is turned on by the ECU to increase the The VSV does not turn on unless all of the abov e turbocharging pressure when the fuel is judged to be premium by the fuel octane judgment function See page 116 and when the coolant temperature and intake air temperature are withi...

Page 136: ...s models VSV and ABV air bypass valve have been used instead of a super charger bypass valve For a deteiled explanation of the construction and operation of the supercharger see Step 3 vol 2 Turbocharger and Supercharger SM C Drive pully EHPS ELECTRO HYDRAULIC POWER STEERING CONTROL SYSTEM In vehicles equipped with the EHPS when the engine coolant temperature or the engine speed is very low the lo...

Page 137: ...mperature below 35 C 95 F ER power enrichment not operating Engine speed below a predetermined level b Deceleration Coolant temperature above 35 C 95 F IDL contact closed accelerator pedal com pletely released Engine speed between about 1000 and 3000 rpm Depending on the engine models VSV Reed valv e r VSV OHP 9 1 From air cleaner AS valve When it is activated by the ECU the VSV introduces intake ...

Page 138: ...System REFERENCE There are some recent models in which the Engine ECU sends the vehicle speed signal or engine speed signal to combination meter The combination meter then operates the speedometer and tachometer based on these signals 130 ...

Page 139: ... engine stalling After a malfunction is corrected the CHECK ENGINE lamp turns off However the ECU memory retains a record of the system in which the malfunction occurred In most engines the contents of the diagnostic memory can be checked by connecting terminal T or TE1 with El of the check connector or TDCL Toyota diagnostic communication link and counting the number of times the CHECK ENGINE lam...

Page 140: ...DIAGNOSTIC CODES page 159 for the normal mode and test mode setting procedure code output methods and code clearing methods In addition various types of information are output by the VF terminal of the check connector depending on the state of the T or TE1 terminal and the state of the IDL contacts of the throttle position sensor For details see VF OR VF1 TERMINAL OUTPUT in this section page 136 P...

Page 141: ...i ECU d E sp unct o n arn ng ay ng ne ata terminals O test mode with connected n engine operating Results of oxygen sen 5 V Rich signa l i l i sor s gna process ng 0 V Lean signal or openloo p operation 4 Diagnostic code display function Off with normal mode 5V Feedback correction no t Off Results of lean mix or 5 V 2 taking plac e On ture sensor signal pro open IT or TE1 cessing 0 V Feedback corr...

Page 142: ...ndicating the malfunction code number In some engines a test mode has been provided which makes the diagnostic system more sensitive This system is also provided with a TE2 terminal in the TDCL or check connector See CHECKING AND CLEARING DIAGNOSTIC CODES page 159 for the normal mode and test mode setting procedure and the code output methods REFERENCE Super Monitor Display When the results of a d...

Page 143: ...de setting procedure and the code output TE1 TE2 and El terminals on the check methods connector or TDCL as shown in the table below T OR TE1 AND El TE2 AND El DIAGNOSTIC CHECK ENGINE LAM P TERMINALS TERMINALS MODE Open Normal Warns driver of malfunctio n Open Connected Test Notifies technician of malfunctio n Open Normal Outputs diagnostic results nature of malfunction b y number of times lamp bl...

Page 144: ... models also have a VF2 terminal In V type engines with a VF2 terminal the VF1 terminal outputs information on the left bank cylinders and the VF2 terminal outputs information on the right bank cylinders In in line 6 cylinder engines with a VF2 terminal the VF1 terminal outputs information on the No 1 to No 3 cylinders and the VF2 terminal outputs information on the No 4 to No 6 cylinders TE 1 Whe...

Page 145: ... of outputting this signal LEAN MIXTURE SENSOR SIGNAL OUTPUT T or TE1 terminal on TE2 terminal off idle contact off This signal is 0 V while air fuel ratio feedback correction is taking place and 2 5 V or 5 V when air fuel ratio feedback correction is not taking place See page 183 for the method of outputting this signal DIAGNOSIS OUTPUT T or TE1 terminal on TE2 terminal off idle contact on J Outp...

Page 146: ...orm of serial communica tions it cannot be read without using a TOYOTA hand held tester DIAGNOSIS READER or DIAGNOSIS MONITOR Refer to the Repair Manual or the Handling Manual of a TOYOTA hand held tester DIAGNOSIS READER or DIAGNOSIS MONITOR for information on the reading procedure and out put parameters REFERENCE I Serial Communication Serial communication is one of digital com munication One pi...

Page 147: ...p 0 8 items 0 41 items Standardize malfunction codes x 0 Output Engine ECU data x 0 17 items Freeze frame data x 0 13 items Communicate between Engine ECU and diagnostic tool x 0 Standardize diagnostic tools x 0 Standardize diagnostic connectors x 0 An Engine ECU function to store important control data into internal memory during the detection of a malfunction The main characteristic of OBD II is...

Page 148: ...OSI S instruments MONITOR or TOYOTA hand hel d tester Output terminal Terminal VF Terminal SDL 2 Communication Slow about 1 5 seconds Fast about 0 05 to 1 0 seconds rate Data display Few Many items Data display method Toyota standard SAE standard ACTIVE TEST 3 Not available Available performed using a n OBD II scan tool or TOYOT A FREEZE FRAM DATA Not available hand held tester i z 3 In the case o...

Page 149: ...TER MINAL tM FP D Only those CC related to the B lJ CD Engine ECU VF1 VF2TE2OX2 TT B TDCL ECT W DLC2 EN G TT E1 TE2 TE1 E l DLC3 BATT SDL CG 3 SDL The communication terminal between the Engine ECU and the TOYOTA hand held tester use the VPW Variable Pulse Width system in accordance with the SAE J1850 requirements zSG Signal graund 3CG Chassis graund ...

Page 150: ...0 N A ON input 4 times to ECU when engine speed is EC U between 500 rpm and 4000 rpm Open or short in IGF or IG T 14 n UJ jL_ Ignition signal ON N A No IGF signal to ECU 4 times in succession circuit from igniter to ECU O Ignite r EC U Open or sho rt in heate r N A Open or short circuit in oxygen sensor heater circuit of oxygen senso r wire HT Oxygen sensor heater rI Oxygen EC U 21 n n sensor OFF ...

Page 151: ...ss 0 signal input to ECU for certain period KNK etc EC U Displayed when A C is ON IDL contact OFF or A C switch syste m Switch R D 2 or L rang e shift lever is in Throttle position senso r 51 s _ condition N A OFF and STA is OFF with the check terminals El IDL circuit x signals and TE1 connected at test mode Accelerator pedal cabl e ECU 1 2 3 4 5 ON displayed in the diagnosis mode column indicates...

Page 152: ...tion switch O N b Mass air flow meter output 2 2 V Open or short in intake air temp senso r P0110 Intake air temp circuit lf i ON Open or short in intake air temp sensor circuit circuit O ma unct on Intake air temp senso r EC U Open or short in engine coolant temp P0115 Engine coolant temp ON Open or short in engine coolant temp sensor sensor circuit circuit malfunction circuit Engine coolant temp...

Page 153: ...sible If an open or sho rt circuit occurs in the air Fixed standard values determine d flow meter signal circuitry it becomes at the time of starting or by the condi Air flow meter VS Air impossible to detect the intake air volume tion of the idle contact are used for or VG signal cir and calculation of the basic injection ig the fuel injection duration and the ig cuitry Isome engine duration cann...

Page 154: ...king occurs or not ignitio n Knock control timing retard control will not be carried out system by the knock control system This could result in damage to the engine If an open or sho rt circuit occurs in the HAC Values for normal operatio n High altitude sensor signal circuitry the high altitude standard values are used The compensatior sensor compensation correction will be either the standard a...

Page 155: ...ode fix ed values are substituted for fuel injection dura tion and ignition timing and as a result engine operation is maintained The back up IC sets the fixed values according to the condition of the STA signal and the idle contact At the same time it lights the CHECK ENGINE lamp to inform the driver Codes are not output in this case however These values differ depending on the engine model In ad...

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Page 157: ...on timing and powerful sparks Making effective use of the diagnostic system See page 131 and taking into careful consideration the three items mentioned above will eliminate the complexities involved in troubleshooting vehicles with TCCS It is also ve ry important to follow the correct procedures at all times This section explains the general procedures and concepts involved in troubleshooting fro...

Page 158: ...DE For vehicles equipped with Page 161 diagnostic test mode only 4 Problem occurs 6 Problem does not occur SYMPTOM SIMULATIO N 5 a CHECKING DIAGNOSTIC CODE Page 15 9 Normal code Malfunction cod e 9 L 7 INSPECTION OF COMPONENTS Page 17 1 BASIC INSPECTION Page 167 CIRCUIT INSPECTION i3 DIAGNOSTIC CODES Page 138 SYMPTOM CHART Page 15 4 V IDENTIFICATION OF PROBLE M 13 14 Page 163 7 1 2 SYMPTOM SIMULAT...

Page 159: ...in step 6 check the trouble area indicated by the diagnostic code chart 1 1 1 2 1 3 15 SYMPTOM CHART If a trouble was not confirmed in step perform troubleshooting according to the in spection items in the symptom chart CIRCUIT INSPECTIO N Proceed with the diagnosis of each circuit between the ECU and the component in accordance with the inspection items confirmed in step or step Determine whether...

Page 160: ... service shop they can be Driving conditions confirmed right away However when the Weathe r symptoms fail to manifest themselves the Why did customer bring vehicle in technician must deliberately try to reproduce Symptoms them For example a problem that occurs onl y when the vehicle is cold or the occurrence of A sample of a PDQ Checksheet is shown on the vibration from the road surface during dri...

Page 161: ...Engine stalls After accelerator pedal is released During A C operation Shifting from N to D Other Others Datels of proble m occurrenc e Frequency of problem Constant Sometimes times per day month Once only occurrence Other Weather Clear Cloudy Rainy Snowy Various othe r o m Outdoor Hot Warm Cool Cold approx _ C _ F temperature E Place road Highway Suburbs Inner city Uphill Downhil l W conditions R...

Page 162: ...o check the wiring harness and connectors when checking the parts themselves 3 One reason why some problems may not be detected by the diagnostic system even when the symptoms do recur is that they may have occurred outside the diagnostic system s range of abnormality detection or the problem not covered by the diagnostic system may have occurred See page 132 SYMPTOM POSSIBLE CAUSE SYSTEM COMPONEN...

Page 163: ...nition system Spark plugs Air hose s Air valve Manifold pressure sensor vacuum sensor Water temp sensor Cold start injector Start injector time SW ISC valve Air valve Water temp sensor Intake air temp sensor Injectors Pressure regulator Cold start injector Air valve Circuit opening relay Fuel filter fuel lin e Cold start injector Spark plugs TYPE OF TROUBLE Won t go on Leakage won t inject inject ...

Page 164: ... go on Air conditioner switch Stays on continuousl y Air induction system ISC valve Stays closed Rough idling Manifold pressure Voltage or resistance Idle speed too sensor vacuum sensor are incorrect open o r low Electronic control short circuit system Neutral sta rt switch Won t o on g Air conditioner switc h Fuel pump Malfunctioning Fuel s stem Injectors Won t inject y Pressure regulator Malfunc...

Page 165: ...tors Drop in injection volum e em ue sys Pressure regulator Fuel pressure too lo w Poor drivability Fuel filter fuel line Clogged Igniter Malfunctionin g Ignition system Ignition coil poor contact Backfiring Spark plugs Misfire Manifold pressure sensor vacuum sensor Electronic control Water temp sensor Voltage or resistance system Intake air temp sensor are incorrect Throttle position senso r Oxyg...

Page 166: ...eakage injects Cold start system continuousl y Start injector time SW Stays on continuously Engine stalls Manifold pressure when accele Electronic control sensor vacuum sensor Voltage or resistanc e rator pedal is system are incorrect Engine stalling depressed Water temp sensor Throttle position sensor Malfunctioning Air induction s stem Engine stalls y when accele Air valve Stays closed rator ped...

Page 167: ...Check connecto r SST or TE1 El 0 TDC L 1 L SST El TE1 CHECK ENGINE LAMP CHECK a The CHECK ENGINE lamp should come on when the ignition switch is turned on engine not running b When the engine is started the CHECK ENGINE lamp should go off If the light remains on it indicates that the diagnostic system has detected a malfunction or abnormality in the diagnostic system OUTPUT OF DIAGNOSTIC CODES 1 N...

Page 168: ...e It will go off for a longer period as follows ri Once between the first and second digit of the same code 1 5 seconds 2 Once between one code and the next code 2 5 seconds 3i Once between all malfunction codes 4 5 seconds NOTE The diagnostic code series will be repeated a s long as check connector terminals T or TE1 and E1 are connected In the event of a number of malfunction codes indication wi...

Page 169: ...alfunction described by the customer If the diagnostic system detects a malfunction the CHECK ENGINE lamp will go on g After performing a road test connect terminal TE1 with terminal El of the TDCL using the SST SST 09843 1802 0 h Read the diagnostic code as indicated by the number of times the CHECK ENGINE lamp blinks NOTE The method used to read the diagnostic code is the same as in the normal m...

Page 170: ...itch off NOTE Clearing the memory can also be done by removing the ba ttery cable from the negative terminal but in this case other memo ry systems radio clock etc will also be cleare d If it is necessa ry to work on engine components requiring removal of the cable from the battery terminal a check must first be made to see if any diagnostic codes have been recorded b After clearing the memory pe ...

Page 171: ... about the problem using the Pre diagnostic Questioning Checksheet then try to reproduce the problem on the customer s vehicle The symptom simulation methods applying vibration heat or humidity described below are effective ways of reproducing the symptoms for problems of this nature OBJECTIVE To learn how to reproduce intermittent problems PREPARATIO N APPLICABLE ENGIN E 1 Terminals have sprea d ...

Page 172: ...eated Using a hair dryer heat the component that is the likely cause of the malfunction Malfunc tions NOTICE D h C o not eat any component to more than 60 140 F temperature limit at which the componen t can be safely touched with the hand Never open an ECU and apply heat directly to th e parts inside it 3 WATER SPRAY METHOD When the malfunction seems to occur on a rainy day or under conditions of ...

Page 173: ...HER When a malfunction seems to occur due to excessive electrical loads Switch on all electrical loads especially loads that On draw a heavy current such as the heater blower hea d I i lamps rear window defogger etc Irv _ 165 ...

Page 174: ...when engine is stopped NO j Charge or replace battery 2 Does engine crank NO Go to Symptom Cha rt see page 154 3 0 0 Visually check to see whether the air cleane r Does engine sta rt Check air filter NOTE In many cases carrying out the basic engine check shown in the following flow chart will allow you to locate the cause of the problem quickly and efficiently For this reason it is essential to pe...

Page 175: ...ure 3 Switch off all accessories 4 Switch off the air conditioner 5 Connect a tachometer test probe to the IG e terminal of the check connector 0 Check the idle speed O K NO 1I LE Idle speed 800 rpm cooling fan off NEVER allow the tachometer test probe to touch ground as it could result in damage to the igniter and or ignition coil As some tachometers are not compatible with this ignition system w...

Page 176: ...ission in the N range Pr r TI d_ L iy FURTHER CHECK 0 Disconnect the SST SST SST 09843 18020 0 Use a timing light to check whether the ignitio n timing advances properly Ignition timing the timing mark moves no more than 5 on each side of the 10 mark Transmission in the N range OK NG Adjust ignition timing Go to Symptom Chart See page 154 169 ...

Page 177: ...tor SST 09 3 FP g 84 1802 0 0 Check if there is pressure in the hose from the Check fuel filter by pinching the hose with you r connector fingers You should hear the sound of fuel passin g through the fuel return hose M3 Fuel pressure can be felt OK NG Repair EFI system See Step 2 vol 5 EFI Check for sparks Repair ignition system See Step 2 vol 3 N G Ignition System Go to Symptom Chart See page 15...

Page 178: ...0 0 0 0 0 Intake air temperature sensor 181 0 0 0 0 0 0 0 0 0 0 Feedback correction Oxygen sensor O2 sensor 182 0 0 0 0 0 0 0 0 Lean mixture sensor 183 0 Variable resistor 184 0 Fuel pump operation 0 0 0 0 0 0 0 0 0 0 0 Fuel pressure 0 0 0 0 0 0 0 0 0 0 0 Injector operation 0 0 0 0 0 0 0 0 0 0 0 Injector injection volume 0 0 0 0 0 0 0 0 0 0 0 Cold sta rt injector 0 0 0 0 0 0 0 0 0 Cold sta rt inje...

Page 179: ...e 3 CONNECT TACHOMETE R Connect the test probe of a tachometer to the IG terminal of the check connector NOTICE NEVER allow the tachometer terminal to touch ground as it could result in damage to the igniter and or ignition coil As some tachometers are not compatible with this ignition system we recommend that you confirm the compatibility of your unit before use 4 CHECK AIR VALVE OPERATION 5 CHEC...

Page 180: ...o adjust the idle mixture if at all possible a Race the engine at 2 500 rpm for approx 90 seconds b Insert a testing probe at least 40 cm 1 3 ft into the tailpipe c Measure the CO concentration for 1 to 3 minutes Idle CO concentration 1 5 0 5 cooling fan off If the CO concentration is not as specified adjust the idle mixture by turning the idle mixture adjusting screw in the variable resistor If t...

Page 181: ...GE OF MANIFOLD PRESSURE SENSOR a Disconnect the manifold pressure sensor connector b Turn the ignition switch on c Using a voltmeter measure the voltage between terminals VC and E2 of the manifold pressure sensor connector Voltage 4 6 V 2 CHECK POWER OUTPUT OF MANIFOLD PRESSURE SENSOR a Turn the ignition switch on b Disconnect the vacuum hose at the intake chamber side c Connect a voltmeter to ter...

Page 182: ...uum Sensor ECU PIM ooooo000 aoooaoooooy o U E2 i mr dno j 11_ _ 0 e Measure the voltage drop at each stage Voltage drop APPLIED 13 3 26 7 40 0 53 3 66 7 VACUUM kPa g 100 20 0 30 1 400 in Hg J 3 94 J 7 87 11 8 15 5 19 69 Voltage drop V 0 3 0 5 0 7 0 9 1 1 1 3 1 5 1 7 1 9 2 1 176 ...

Page 183: ...throttle position sensor and throttle body PREPARATIONS Ohmmeter also called circuit tester or multi tester Feeler gauge APPLICABLE ENGINE 4A FE Sep 1989 Only for Carina 11 AT 171 with lean mixture senso r ON VEHICLE INSPECTION 1 INSPECT THROTTLE BOD Y a Check that the throttle linkage moves smoothly b Check for vacuum at the N po rt Sta rt the engine Check for vacuum with your finger 177 ...

Page 184: ... E2 2 300 or less 0 59 0 023 IDL E2 Infinity Throttle valve fully opened y fA E2 3 300 10 000 VC E2 3 000 7 00 0 d Reconnect the sensor connector INSPECTION OF THROTTLE BODY 1 CLEAN THROTTLE BOD Y a Using a soft brush and carburetor cleaner clean the cast parts b Using compressed air clean all passages apertures NOTICE To prevent damage do not clean the throttle position sensor 2 INSPECT THROTTLE ...

Page 185: ... lever c Connect the test probe of an ohmmeter to terminals IDL and E2 of the sensor d Gradually turn the sensor clockwise until the ohmmeter deflects then secure it with the two screws e Recheck the continuity between terminals IDL and E2 CLEARANCE BETWEEN LEVER CONTINUITY IDL E2 AND STOP SCREW mm in 0 35 0 014 Continuity 0 59 0 023 No continuity 179 ...

Page 186: ...th lean mixture sensor 1 INSPECT AIR GAP Using a feeler gauge measure the gap between the signal timing rotor and the pickup coil projection Air gap 0 2 mm 0 008 in or more If the air gap is not as specified replace the distributor housing 2 INSPECT SIGNAL GENERATOR PICKUP COIL RESISTANCE Using an ohmmeter measure the resistance between the terminals G1 and G G NE and G 6 Pickup coil resistance co...

Page 187: ...ATION Ohmmeter also called circuit tester or multi tester APPLICABLE ENGINE 4A FE Sep 1989 Thermistor 20 0 20 40 60 80 100 120 4 32 68 104 140 176 212 248 Temperature C F W INSPECTION OF INTAKE AIR TEMPERATURE SENSO R Using an ohmmeter measure the resistance between the terminals Resistance Refer to the chart above If the resistance is not as specified replace the sensor 181 ...

Page 188: ...r to check connector terminals VF or VF1 and E1 NOTICE If terminals T or TE7 and E7 are not connected 0 V 2 5 V or 5 V will be output from the VF or VF1 terminal The meaning of this VF voltage differs depending on the engine For further details see page 136 c Connect terminal T or TE1 with terminal El of the check connector SST 09843 18020 d Warm up the oxygen sensor to operating temperature by ru...

Page 189: ... El of the check connector SST 09843 18020 d Warm up the lean mixture sensor to operating temperature by running the engine at idle for at least 10 minutes e To start feedback correction race the engine at 3 500 rpm then repeat 20 seconds later f While the maintaining engine speed at 1 500 rpm check the VF terminal voltage 0 V Air fuel ratio feedback correction is taking place 2 5 V or 5 V Air fue...

Page 190: ...cuit tester or multi tester APPLICABLE ENGINE 4A FE Sep 1989 INSPECTION OF VARIABLE RESISTOR 1 INSPECT VOLTAGE OF VARIABLE RESISTOR a Using a voltmeter measure the voltage between ECU terminals VC and E2 Voltage 4 6 V b Measure the voltage between ECU terminals VAF and E2 while slowly turning the idle mixture adjusting screw first fully counterclockwise then fully clockwise 184 ...

Page 191: ...r connector b Using an ohmmeter measure the resistance between terminals VC and E2 Resistance 4 6 kS2 c Turn the idle mixture adjusting screw fully counterclockwise d Connect an ohmmeter to terminals VAF and E2 Turn the adjusting screw fully clockwise and check that the resistance changes from approx 5 kS2 to 052 185 INSPECTION AND ADJUSTMENT Variable Resistor ECU O 00 000ooooory ooooo000000 ...

Page 192: ... sensor PREPARATIONS Ohmmeter also called circuit tester or multi tester 12 V battery APPLICABLE ENGINE 4A FE Sep 1989 INSPECTION OF ISC VALVE 1 INSPECT ISC VALVE FOR OPEN CIRCUIT Using an ohmmeter check for continuity between the terminals Resistance 2WD 30 33 S2 4WD 30 34 12 If there is no continuity replace the ISC valve 186 ...

Page 193: ...ntinuity between each terminal and body If there is continuity replace the ISC valve 3 INSPECT ISC VALVE OPERATION a Check that air does not flow from pipe E to pipe F b Apply battery voltage across the terminals c Check that air flows from pipe E to pipe F If operation is not as specified replace the ISC valve 187 ...

Page 194: ...G NE 36 2 Sequential Without valv e 2JZ GE TCCS L EF I KSI G1 G211 1 NE 24 Linear type Sequential With With With Stepper moto r D EFI j j With or j PIM Without j 3 groups Without j j j L EFI G1 G2 1 NE 1241 Independent h W VG NE2 36 2 Sequential it T 2JZ GTE TCCS L EF I VG G1 G2 1 NE 12 Linear type Independen t Sequential With With DIS With Stepper moto r 1G FE EFI L EF I 1 SVS Without IDL TL PSW ...

Page 195: ... t pe o r D I Independent With Lean j j Ni 24 EL LSW Sequential mix sensor j Linear type j t Rotary solenoid valve G 1 2 groups With or T With or NE 4 Without Withou t j 6 G 1 j With j With j NE 36 2 Independent Sequential 5A FE TCCS D EFI NE 4 Linear type Simultaneous With With With Rotary solenoi d l PIM va v e 7A FE TCCS D EFI G 1 Linear type 2 groups With With With Rotary solenoi d l v PIM NE ...

Page 196: ... Rotary solenoi d VG NE 36 2 valv e 22R E EFI L EF I 1 VS Without IDL TL PSW Simultaneous Without Without Without Bi metal i l a r va v e TCCS NE 4 Linear type 1 With With With Bi metal or Therm o wax air valve 4Y E TCCS L EFI NE 4 IDL E PSW Simultaneous With With Without VSV Bi meta l 1VS air valv e 1 2 3 a 5 s The VS means the type 1 air flow meter while the VS means the type 2 air flow meter Fo...

Page 197: ...TOYOTA 11 QUALITY SERVICE OVERSEAS SERVICE DIVISION TOYOTA MOTOR CORPORATION PRINTED IN JAPAN c 9109 N2 9710 NAME ...

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