Delorean DMC-12 1981 Скачать руководство пользователя страница 83

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Содержание DMC-12 1981

Страница 1: ...TECHNICAL INFORMATION MANUAL P J GRADY INC 516 589 6224 800 350 7429 FAX 516 589 6241 ...

Страница 2: ...P J GRADY INC 516 589 6224 800 350 7429 FAX 516 589 6241 ...

Страница 3: ...r f tf DE LOREAN MOTOR COMPANY r TECHNICAL INFORMATION MANUAL 1981 DeLorean n r Technician Name Dealership Name Instructor Name _ Date PRINTED 3 81 ...

Страница 4: ...he objective of DMC and the Service Training Department to provide the DMC serv ice technician with as much accurate and usable service information as is available as quickly as possible in order to sustain a high quality service standard IMPORTANT The De Lorean contains many parts dimensioned in the metric system During any service procedure replacement fasteners must have the same measurements a...

Страница 5: ... 21 B Starter Motor Circuit 29 C Charging System 32 D Cooling Fan Circuit 35 III FUEL INJECTION 39 IV EMISSION CONTROLS 63 A Lambda Control System 65 B Idle Speed Control System 77 C Evaporative Emission Control System 84 D Air Inlet System 87 E Ignition Vacuum Advance Control 88 F Deceleration Control 89 V CHASSIS ELECTRICAL 91 A Fuses and Fuse Box 93 B Relay Compartment 94 C Ignition Switch Circ...

Страница 6: ...peed 118 3 CO Emission 119 B System Operation Tests 1 Lambda System 122 2 Idle Speed Control System 124 C Diagnostic Charts 1 Ignition System Engine Will Not Start 126 2 Fuel System Engine Will Not Start 128 3 Lambda System 130 4 Troubleshooting Diagnostic Chart 132 VII SPECIFICATIONS CAPACITIES 133 F pi r in f ...

Страница 7: ...r r F r r r r r r r r r r r r r GENERAL INFORMATION ...

Страница 8: ... V TT 1 ...

Страница 9: ...caps The upper crankcase also contains the chain driven oil pump drive and driven gears The oil pump body is a machined portion of the upper crank case The lower crankcase provides side engine mount locations and completes the crankcase assembly The aluminum oil pan which houses theoil splash shield and oil pick up assembly is secured to the lower crankcase CYLINDER HEADS The aluminum alloy cross ...

Страница 10: ...cket oil pump sprocket The drive chains and sprockets are covered by a timing chain cover which is secured to the upper and lower crankcase assembly ENGINE COOLING Thevehicle has two 2 electric fans for radiator cooling mounted at the front of the vehicle These fans are activated when the engine coolant tempera ture exceeds 97 C 206 F and deactivated at 91 C 195 F Operation of these fans is contro...

Страница 11: ...parts The final drive components are also contained within thetransmission case Both the final drive and transmission use the same lubricant eliminating the need for a separate final drive lube The power train consists of A Primary input shaft B Secondary output shaft C Six driving gears D Six driven gears E One reverse slider gear The selector control consists of A Four shift rods and shift forks...

Страница 12: ...tor shaft arm attached to the selector shaft fits through a slot in the _ pivoting interlock When a gear is selected the selector shaft arm moves the interlock to the desired position and moves the appropriate shift rod in or out depending on the gear selected The shift fork attached to the shift rod moves the desired gear into the proper position while the sychronizer ring matches the speed of th...

Страница 13: ... clutch pedal is depressed OPERATION The clutch pedal is connected to the master cylinder with a pushrod When the pedal is depressed the pushrod exerts pressure against the master cylinder piston As the piston begins to move it draws fluid from the fluid reservoir and forces it through the hydraulic line to the slave cylinder piston Slave cylinder piston pressure causes the clutch fork to move the...

Страница 14: ...ft is splined to the converter and turns at engine speed Main line pressure is regulated by a pressure regulator valve and a vacuum operated actuator As engine vacuum decreases the valve increases main line pressure to assure positive application of the clutches and reaction members The shift valves in the valve body are controlled by a computer governor assembly and two 2 electric solenoids By co...

Страница 15: ...sis frame tower at the absorber s upper end and to the lower control arm at the absorber s lower end are positioned through the coil springs The single front hub bearing supports the hub assembly on the spindle which is fastened to the steering knuckle The steering knuckle is secured to the upper and lower control arms with upper and lower ball joints and to the steering system with an adjustable ...

Страница 16: ...bsorbers secured to the chassis frame at the absorber s upper end and to the rear hub carrier at the absorber s lower end are positioned through the coil springs The rear hub carrier is attached to the chassis frame with upper and lower links as well as the radius arm Rear suspension toe in is achieved by shimming the radius arm at its frame attaching location I P 10 r j ...

Страница 17: ... fits through an opening in the driver s foot well and is sealed with a gasket and plate The lower end of the steering column shaft is secured to the upper universal joint of the intermediate shaft The lower universal joint of the intermediate shaft is secured to the splined stub shaft of the steering gear The steering unit consists of a rack and pinion assembly tie rod assemblies and tie rod ends...

Страница 18: ...der consists of two 2 independent cylinders in a single casting Should one cylinder or system fail the other system will remain operational Each hydraulic system front and rear has a separate brake fluid supply well in the brake fluid reservoir which is mounted to the top of the master cylinder The brake fluid reservoir is equipped with a float actuated low fluid warning indicator However this sys...

Страница 19: ...oor face level vent chamber or both The footwell wind shield chamber contains a horizontally mounted door which directs the conditioned air either to the windshield or the footwell The door face level vent also contains a horizontally mounted door which either shuts off face level vents or shuts off a bridg ing duct connecting with the windshield vent All doors with the exception of the cable oper...

Страница 20: ...k Brown Lower Mode Door Port 1 Black Supply from Reservoir SELECTOR ROTARY VALVE Port 3 Black Orange Recirculation Door and Water Valve Port 4 Black Blue Windshield Vent Door Port 5 Black Red Upper Mode Door and Face Level Vent Door y v i VACUUM SWITCHING SELECTOR CONTROL POSITION CONNECTION 1 Source 2 Lower mode door 3 Re circulation door water valve 4 Windshield door 5 Upper mode door face level...

Страница 21: ... air is supplied to the door vents and face level vents The water valve is closed so that the heater core remains cold NOTE The re circulation door is designed not to seal the fresh air vent com pletely This prevents stale air from developing in the vehicle Norm Vacuum is supplied to the lower mode door Port 2 and face level vent door Port 5 The re circulation door closes the re circulation vent a...

Страница 22: ...ow pressure low temperature vapor After being compressed it leaves as a high pressure high temperature vapor This vapor flows to the condenser where it is cooled by air flow through the condenser As the refrigerant vapor gives up heat it changes from high pressure high temperature vapor to high pressure liquid The liquid then passes through the orifice tube where it becomes a low pressure low temp...

Страница 23: ... epoxy coated steel backbone center tunnel frame with front and rear wishbones supporting crossmembers and 4 wheel fully independent suspension The front crossmember carries the steering and front suspension components The rear crossmember is welded to the center backbone and carries the engine and transaxle assemblies The bumpers sills and spoiler are semi rigid endura polyurethane capable of con...

Страница 24: ...r r r i I r r r f r r p f ENGINE ELECTRICAL 19 ...

Страница 25: ...odifications The breaker points in the distributor have been replaced by a pulse generator con sisiing of a stator an induction coil and a trigger wheel The pulse generator is con nected to an electronic control unit ECU module in which the signal from the dis tributor is converted and amplified The ECU module is connected to a high voltage ignition coil 1 Distributor 2 ECU module 3 Compensating r...

Страница 26: ... alternating voltage is produced in the pulse generator This pulse is transmitted to the ECU module and its voltage will vary between 0 3V and 100V depending on engine speed The alternating voltage is produced by the trigger wheel passing through a magnetic field which creates a voltage in the induction coil As the pole on the trigger wheel approaches the pole on the stator a positive voltage is p...

Страница 27: ... distributor This information is electronically analyzed and the proper dwell angle is established for different engine speeds By varying the dwell angle the coil is capable of operating at maximum efficiency After the dwell angle is determined the output transistor turns the ignition coil primary circuit on and off When current is flowing in the primary circuit a magnetic field is built up within...

Страница 28: ...ent overheating of the coil during operation To provide increased coil volt age for starting the engine one half of the resistor is bypassed during the engine cranking process By reducing the circuit resistance the coil primary voltage and current will increase thus increasing the secondary output voltage IGNITION TIMING ADVANCE The Bosch distributor provides timing advance by means of a centrifug...

Страница 29: ...on switch is run or start position From starter motor solenoid Hot during cranking only W 0 5 ohm From main relay Hot CJ when ignition switch in run or start position WY I I I I i I f 5 ohm Compensating Resistor ECU Module 16 16 15 31d 7 31 mrrr WS Hd 7 31 R B WY Screened Cable 15 Distributor ELECTRONIC IGNITION CIRCUIT 25 ...

Страница 30: ...ne components To remove the complete distributor it is necessary to loosen the fuel inlet system to provide sufficient clearance for removal of the distributor assembly 6 THE ECU module cannot be repaired or adjusted It is located in the bottom of the module compartment behind the driver s seat The ignition ECU module is silver in color and is mounted under the black idle speed ECU module 7 The ig...

Страница 31: ...ri butor is used which has unequal spacing of the ignition secondary terminals When viewing primary and secondary patterns on a scope the patterns will have unequal dwell spacing 13 The ignition dwell angle is electronically controlled and will vary with engine RPM p i r tm l f fflTO 27 ...

Страница 32: ...disconnected 895 1 285 ohm 0 25 mm use non magnetic feeier gauge Dwell angle is electronically controlled and will vary with engine RPM 5 in hg 3 10 in hg 12 15 in hg 20 1000 RPM engine 0 2000 RPM engine 10 3000 RPM engine 14 4000 RPM engine 20 5000 ohms f r COIL Primary winding resistance Secondary winding resistance Average Current Value Through Primary Winding at Idle SPARK PLUGS Torque Specifi...

Страница 33: ...unning clutch is used in the starter drive gear to prevent damage to the starter motor after the engine starts if the ignition key is not released immedi ately r r STARTER MOTOR The electrical circuit that activates the starter contains a start inhibit relay When the ignition switch is turned to the start position the start inhibit relay is energized allowing current to flow to the starter solenoi...

Страница 34: ...ission the neutral start switch 4 must be in the neutral or park position to complete the ground circuit of the start inhibit relay Manual transmission cars are connected to ground at the transmission wiring harness eliminating the neutral switch completely As the solenoid plunger moves rearward and engages the starter drive gear to the flywheel electrical connection is made between the battery an...

Страница 35: ...or replacement 2 The start inhibit relay is located in the relay panel in the relay compartment behind the passenger seat See Chassis Electrical section 3 The automatic transmission neutral start switch is part of the valve body controls and is not adjustable 4 The electrical portion of the ignition switch can be replaced without removing the lock cylinder and steering lock assembly 31 ...

Страница 36: ...the charge indicator lamp The charge indicator lamp operation is controlled by the voltage regulator Whenever the ignition switch is in the run position and the alternator is not producing voltage the voltage regulator will allow current to flow through the indicator bulb circuit lighting the lamp Any voltage produced by the alternator above that of the battery will cause the voltage regulator to ...

Страница 37: ...ngs 4 Current maximum output should be within ten percent of alternator rating at ap proximately 3 000 RPM with an electrical load of 80 amps p NOTE If carbon pile tester is not available load the system by turning on all lights and accessories NOTE It is not possible to full field the alternator to determine if the regulator is defective DO NOT attempt to by pass the regulator by using jumper wir...

Страница 38: ...coolant temperature increases above normal The temperature sensor is calibrated to turn the fans on at approximately 97 C 207 F and turn off when the temperature drops below 91 C 196 F The fans will remain on continuously if the coolant temperature does not drop below 91 C The cooling fan circuit is also controlled by the air conditioning electrical circuit Whenever the air conditioning compressor...

Страница 39: ...ssor J HOT when A C Compressor engaged W ss From Main Feed Wire l HOT at all times N s From Main Relay HOT when ignition switch is in Run or Start position N BO BO o r V 0 Q NO B BG B BG BO 1 BO BG R BG R E M 3 H M H B B 1 1 COOLING FAN CIRCUIT 1 Cooling fans 2 Fan fail module 3 Fan fail warning lamp 4 Circuit breaker 5 Fan relay 6 Temperature switch 7 A C diode f v 36 ...

Страница 40: ...t the cooling fan circuit from feeding back into the air conditioning circuit Current supplying the fan motors passes through a circuit breaker 4 which is used to protect the circuit from overload The circuit breaker is designed to accept the high current surge developed when the fans start into operation but will open the circuit if excessively high current flows due to a shorted or siezed fan mo...

Страница 41: ...fan fail module are located in the 1 relay compartment behind the passenger seat See Chassis Electrical section I 3 The A C diode color coded black can be removed from the wiring harness and replaced if defective NOTE A shorted A C diode would cause the A C compressor to run when the temperature switch closes and the A C control is in the off position m m t 38 mm ...

Страница 42: ...r r m P 1 r r p FUEL INJECTION 39 ...

Страница 43: ... fuel pump mounted inside the tank provides fuel at a constant pressure to the mixture control unit The control unit consists of an air flow sensor which measures the flow of air entering theengine and a fuel distributor which is mechanically operated by the air flow sensor The fuel distributor provides the injection valves with the correct amount of fuel The fuel is injected into the inlet manifo...

Страница 44: ...ANK 2 FUEL PUMP 3 FUEL ACCUMULATOR 4 FUEL FILTER 5 FUEL DISTRIBUTOR 7 CONTROL PRESSURE REGULATOR 8 AIR FLOW SENSOR 9 COLD START VALVE 10 THERMO TIME SWITCH 11 INJECTORS 6 PRIMARY PRESSURE REGULATOR 12 THROTTLE VALVES pre n 42 ...

Страница 45: ...e fuel pressure in the system The regulator is located inside the fuel distributor 7 Control Pressure Regulator The control pressure regulator provides fuel enrichment during warm up and cold acceleration The regulator is mounted on the left valve cover 8 Air Flow Sensor The air flow sensor measures the amount of air entering the engine 9 Cold Start Valve An electrically operated cold start valve ...

Страница 46: ...ount of air entering the engine is controlled by the throttle valves engine speed and engine load Air flowing through the air funnel 1 moves the sensor plate 2 downward in direct proportion to the air volume This movement is transferred by the balanced lever assembly 3 to the control plunger 5 located in the fuel distributor 44 ...

Страница 47: ...nt of fuel to the injectors is constantly controlled by the control plunger moving in relation to the amount of air entering the engine From fuel pump In the actual fuel distributor there are six chambers that are separated by a diaphragm c The lower chambers a are connected together and the upper chambers b are separated with each one containing a pressure differential valve The pressure differen...

Страница 48: ...ne is running It supplies fuel to the lower chambers of the fuel distributor Any fuel that is not used returns to the fuel tank by passing through the primary pressure regulator 5 The primary pressure regulator controls main line fuel pressure If the main line pressure increases above a pre set value the pressure forces the regulator open This allows fuel to return to the tank maintaining a consta...

Страница 49: ... at the fuel pump Main line pressure is regulated at approximately 5 2 Bar 75 4 PSI The pump continuously circulates approximately 29 gallons of fuel per hour through the system The fuel accumulator 3 will charge during the first seconds of operation This charging process will dampen initial fuel pump surge When the engine isshutdown several check valves close throughout the system and prevent fue...

Страница 50: ...erred to as the control pressure The control pressure generates an opposing force to that originating from the air flow sensor plate When the control pressure regulator 3 decreases the control pressure the sensor plate will travel further downward per given air volume thus increasing the amount of fuel injected to the engine rich mixture Increasing the control pressure will reduce the sensor plate...

Страница 51: ... the cranking process The cold start valve 1 is of the solenoid operated type The winding of an electro magnet is fitted inside the valve In the off position the moveable armature of the electromagnet is forced against a seal by means of a spring When the magnet is energized the armature is pulled away from the seat and fuel is allowed to flow through the valve A special nozzle atomizes the fuel a...

Страница 52: ...tro magnet and injecting additional fuel to the engine while it is being cranked During cranking voltage is also applied to the heating element in the thermo time switch The heating element will warm the bimetal arm and open the contact points to prevent excessive cold start injection flooding The length of time that it takes the heating element to open the contact points is dependent on the engin...

Страница 53: ...mperature The regulator contains both a bimetal arm a which reacts to the engine temperature and an electrical heating element b As the bimetal arm bends the circuit pressure changes by opening or closing a passage c which allows fuel to return to the tank On a cold engine the bimetal arm will open the passage allowing more fuel to return to the tank lowering the control pressure This enriches the...

Страница 54: ...upper chamber due to the delay valve The diaphram separating these two chambers then deflects downwards opening the pressure regulator momentarily This results in a very short enrichment spike in the air fuel mixture Control Pressure Regulator 1 Delay valve 2 Thermal vacuum control valve Coolant Distribution Pipe The vacuum delay valve 1 located in the hose connected to outlet b provides a 10 seco...

Страница 55: ... an electronic idle speed control system is used The air adjusting screw 1 should be fully seated to eliminate any air bypass at the throttle plates The idle speed regulator 5 allows the proper amount of air to bypass the closed throttle plates during an idle condition The CO adjusting screw 4 is used to control the amount of injected fuel in relation to the position of the air sensor plate Turnin...

Страница 56: ...revent vapor from forming in the lines and insure instant restarting When the fuel pump stops a check valve 1 and two seals 2 3 close sealing off the fuel return lines to the tank The accumulator will then maintain pressure in the system to prevent vaporization In addition to the check valves and seals it is important that the control plunger b returns to the closed position all injectors a close ...

Страница 57: ...m t w p 1 r COMPONENT LOCATION r r r Mixture Control Unit Control Pressure Regulator Cold Start Valve 55 Fuel Pump Accumulator Thermo Time Switch RB 1 ...

Страница 58: ...removed from the mixture control unit for replacement Fuel distributor is not serviceable The regulator O ring seals are replaceable and the primary pressure may be adjusted by adding or subtracting spring shims Sensor plate and arm assembly can be centered if a binding condition exists Rest position of sensor plate can also be adjusted Not serviceable Not serviceable Not serviceable Not serviceab...

Страница 59: ... supplied to the fuel pump and control pressure regulator PI The RPM relay remains closed as long as the ignition switch is on and the engine is running If the pulses from terminal 1 of the ignition coil stop because the engine has stopped turning the RPM relay opens about one second after the last pulse is received This safety circuit prevents the fuel pump from pumping when the ignition i switch...

Страница 60: ...be removed from the mixture control unit for replacement Fuel distributor is not serviceable The regulator O ring seals are replaceable and the primary pressure may be adjusted by adding or subtracting spring shims Sensor plate and arm assembly can be centered if a binding condition exists Rest position of sensor plate can also be adjusted Not serviceable Not serviceable Not serviceable Not servic...

Страница 61: ...on the inertia switch is in ft the up position the switch is in the open position In this position the fuel pump will not operate and the door locks will move to the unlock position To reset the inertia switch depress the button or move to the down position m 7 Excessively high fuel pressures can be caused by a plugged fuel return line t 8 Positive pressure buildup in the fuel tank is normal for t...

Страница 62: ... temp above 40 C a Test with intake manifold vacuum hoses disconnected from control pressure regulator b Connect vacuum pump to vacuum port on control pressure regulator which contains the delay valve Vacuum Setting Value 450 550 mbar 13 3 16 2 in Hg 4 Primary Pressure Checking value Setting value 5 Rest pressure leakage test Rest Pressure Minimum pressure after 10 min 6 Injection valves Opening p...

Страница 63: ...itch Coolant Temperature Contact Opening Time 20 C 5 F 7 5 2 seconds 35 4 C 95 F 0 10 Fuel line tightening torques M8 Bolt 10 12 Nm 7 9 FT Lb MIOBolt 13 15 Nm 9 11 FT Lb M12Bolt 20 24 Nm 14 17 FT Lb M14Bolt 15 20 Nm 11 14 FT Lb M12CapNut 15 20 Nm 11 14 FT Lb M14 Cap Nut 25 30 NM 18 22 FT Lb 11 Throttle idle stop adjustment See Engine adjustment tests and diagnosis sec tion 1 5 r p t 0 pT l 61 r ...

Страница 64: ...o by pass the RPM relay remove relay and connect a jumper wire between terminals 87 and 30 in the connector The RPM relay is located in the relay compartment behind the passenger seat See Chassis Electrical section CAUTION When connecting or disconnecting the test gauge rest pressure will be present in the fuel system Fuel fittings should be loosened slowly to avoid fuel spray in the engine compar...

Страница 65: ... 1 r f EMISSION T CONTROLS r r j r l 1 I r r 63 ...

Страница 66: ...gree of accuracy so that the engine will operate within an ideal air fuel mixture range r LAMBDA CONTROL PRINCIPLE The control principle employed is based on the fact that the Lambda sensor is con tinuously monitoring the exhaust gas and informing the fuel injection system to mod ify the mixture for minimum emissions Acting as a monitoring device the oxygen sensor in the exhaust pipe provides data...

Страница 67: ... it produces an electrical signal which informs the Lambda ECU module if theengine is running richer or leaner than the ideal air fuel mixture ratio The sensor is mounted in the exhaust pipe in a position where it will monitor the exhaust gas from both cylinder banks before it enters the catalytic converter r v OXYGEN SENSOR f v rj F F 1 66 ...

Страница 68: ...ure Jl r FREQUENCY VALVE The frequency valve regulates the pressure in the lower chambers of the fuel distributor This regulation will affect the normal operation of the fuel distributor The frequency valve is an electrically operated valve It is mounted on the right valve cover and is connected to the lower chambers primary pressure of the fuel dis tributor and the return line to the fuel tank r ...

Страница 69: ...turn to the tank When the lower chamber pressure is reduced the diaphragm downward movement will increase the passage opening to the injectors This will increase the volume of fuel being injected to the engine en richening the mixture When thefrequency valvecloses the pressure in the lower chambers will return to normal and the diaphragm will return to its original position Lambda ECU Module LAMBD...

Страница 70: ... open 80 percent of the time and closed 20 percent of the time during one cycle of operation CLOSED JW 9 Pulse Rntin 80 20 OPEN 80 One Pulse Cy 10 cle 70 Pulse Cycles Per Second CLOSED OPEN Pulse Ratio 60 40 3 60 1 One Pulse 40 Cycle To operate the frequency valve at a pulse ratio of 80 20 the ECU module will allow current to flow through the frequency valve for 80 percent of one cycle and stop th...

Страница 71: ... more fuel intotheengine The fuel mixture is now enrichened The oxygen sensor will then sense the richer mixture and signal the ECU module to switch the frequency valve back to ashorteropen time pulse ratio that will reduce the amount of fuel injected This process repeats constantly to maintain the ideal air fuel mixture ratio INJECTED FUEL QUANTITY INCREASES RICH MIXTURE LOW CONTENT OF OXYGEN IN ...

Страница 72: ...operation The fixed ratio will provide a richer fuel mixture than normal The pulse ratio is controlled at another fixed value when the engine coolant tempera ture is below 15 C 59 F or when the engine is at wide open throttle These conditions are determined by a thermal switch 1 and a full throttle micro switch 2 The fixed pulse ratio provides a rich fuel mixture to improve engine performance when...

Страница 73: ... From RPM Relay Terminal 87b J HOT only when engine is rotating N From Main Feed Wire HOT at all times piTTm N iFr J J I S 7 FUSE Diagnostic Plug JB Jj RN Shielded Cable l M HV 1 ECU Module 2 Lambda Relay LAMBDA CONTROL CIRCUIT 3 Frequency Valve 4 Oxygen Sensor 5 Full Throttle Enrichment Switch 6 Thermal Switch 72 ...

Страница 74: ...produced by the sensor During operation the ECU module will analyze the oxygen sensor signal and send a pulse cycle signal to the frequency valve This signal will allow a pulsating current flow to the valve which will turn it on and off as required The pulse cycle can be measured by connecting a dwell meter to the diagnostic plug which is connected to terminal 17 of the ECU module The full throttl...

Страница 75: ...Electronic Control Module Oxygen Sensor Air Metering Unit Fuel Fuel Distributor Return Clean Exhaust Gas LAMBDA CONTROL SYSTEM From Fuel Pump Frequency Valve 74 ...

Страница 76: ... threads Do not allow any of the compound to get on the tube pro jecting from the sensor Do not attempt to disconnect the wire lead directly at the sensor 3 If it is necessary to supply power to the Lambda system when the engine is not running by pass the RPM relay by removing the relay and connecting a jumper wire between terminals 87b and 30 in the connector The RPM relay is located in the relay...

Страница 77: ... Cap Nut M14 Cap Nut 5 Pulse Ratios A Normal Operation Sensor connected and CO properly adjusted B Oxygen sensor disconnected C Oxygen sensor lead dis connected Ground lead D Oxygen sensor lead disconnected 1 5 volts applied to lead E Full throttle or engine cold below 15 C or 59 F 10 12 Nm 7 9 FT Lb 13 15 Nm 9 11 FT Lb 20 24 Nm 14 17 FT Lb 15 20 Nm 11 14 FT Lb 15 20 Nm 11 14 FT Lb 25 30 Nm 18 22 ...

Страница 78: ...electronic control unit ECU module is constantly monitoring the engine speed during an idle condition and correcting this speed when necessary The idle speed regulator contains a rotary valve which controls the air flow through a duct that by passes the throttle plates During engine warm up for example the engine speed is reduced due to friction The idle speed regulator will open allowing addition...

Страница 79: ...old To Inlet Manifold Below Throttle Plates Air In IDLE SPEED REGULATOR The idle speed control system is only in operation when a microswitch 1 is closed by the throttle plates being in a fully closed position This switch is located on the engine throttle linkage and allows the ECU module to operate The ECU module senses engine speed from the tachometer and activates the idle speed regulator The r...

Страница 80: ...hermistor located on the cool ant distribution pipe signals the ECU module to switch the regulator to a wider open position This will increase the idle speed fast idle during the engine warm up period r r t Coolant Distribution Pipe THERMISTOR r rt raj r 79 ...

Страница 81: ...T GREEN BS BLACK SLATE BR BLACK RED BK BLACK PINK From Main Relay Hot when ignition switch in run or start position From coil terminal 1 RPM pulse signal IDLE SPEED CONTROL CIRCUIT H 1 ECU module 2 Idle Speed Regulator 3 Thermistor 4 Idle Speed Diode 5 Idle Speed Micro Switch ipriT 80 ...

Страница 82: ...itch to provide its ground A thermistor 3 located in the coolant system distribution pipe will activate another circuit within the ECU module when the coolant temperature is below 15 C 59 F This circuit will provide a fast idle condition The ECU module receives an RPM signal from coil terminal 1 When the engine idle speed is above or below specifications the ECU module activates the electric motor...

Страница 83: ... in the upper portion of the compartment 3 The idle speed diode is located in the module compartment behind the driver s seat The diode is black in color 4 The idle speed micro switch is not adjustable and is preset to activate the control system when the throttle plates are in the closed position 5 Engine idle speed is not adjustable Speed is electronically controlled to 775 RPM 50 RPM 6 Do not d...

Страница 84: ...r r r r r r r r r r r r t r COMPONENT LOCATION IDLE SPEED REGULATOR ELECTRONIC CONTROL MODULE IDLE SPEED CONTROL SYSTEM r r 83 ...

Страница 85: ...rged from the system and burned in the engine SYSTEM OPERATION 1 Vapor Outlet 2 Vapor Separating Hose 3 Roll Over Valve 4 Vapor Hose to Canister The entire fuel system is sealed to prevent fuel vapor from escaping Gasoline vapor in the fuel tank is routed through the vaporseparating hose 2 and the roll over valve 3 to a storage canister in the rear of the car When the engine is not running fuel va...

Страница 86: ...ir tube to the vapor canister Opening of the purge valve allows the canister to be purged of fuel vapors These vapors are drawn into the cold start valve air tube which is connected to the air inlet system The vapors are mixed with incoming air and burned in the combustion chambers The engine oil filter cap is also connected to the cold start valve air tube This allows any engine vapors to be draw...

Страница 87: ...cuum to the crankcase which is completely sealed to outside air a A plugged orf ice in the cold start valve air tube or a plugged hose that connects the oil filler cap to the air tube would cause excessive pressure build up within the crankcase resulting in possible oil seal and or gasket damage b An air leak in the engine crankcase will cause a lean running condition since the crankcase is connec...

Страница 88: ...ir cleaner assy 2 Cold air inlet 3 Hot cold air valve housing 4 Hot air stove 5 Exhaust manifold i A wax thermostat inside the air valve housing determines the position of a flap con trolling the incoming air The flap is fully open to exhaust manifold heated air at temperatures below 15 C 59 F As ambient temperature increases theflapallowsa mixture of hot and cold air to enter the engine until 25 ...

Страница 89: ...aching the distributor advance Above 40 C the control valve is open allowing vacuum to pass to the solenoid valve B Vacuum Connection Spark Advance Electric Connection to Micro Switch Throttle Lever The electrically operated solenoid valve B is energized whenever the throttle plates are closed Energizing the solenoid closes the vacuum passage to the distributor ad vance thus eliminating an over ad...

Страница 90: ...air flow through the air flow sen sor To eliminate this lean condition which causes high hydrocarbon emissions a by pass valve is located in each throttle plate The by pass valves open when the manifold vacuum is above the normal idling vacuum This allows enough air flow to by pass the throttle plates and permit con tinued fuel injection ENGINE AIR Bypass valve Throttle plate 89 ...

Страница 91: ...I I A UP p CHASSIS ELECTRICAL V 91 ...

Страница 92: ... Windshield wiper and washer motors Directional indicator switch and stop light switch All dash instruments and indicators service interval counter cool fan relay and voltage regulator charge lamp circuit Hazard warning switch horns and buzzer logic box Lambda relay Lambda ECU frequency valve fuel pump and control pressure regulator R H tail lamp side lamps front parking lamp license plate lamp ci...

Страница 93: ...RELAY COMPARTMENT CD CAUTION DO NOT INTERCHANGE MODULES See Handbook I 1 1 9 RED 10 11 12 13 GREEN 16 L 14 r I I 17 I r L 21 20 J 1 1 ...

Страница 94: ...N RELAY 7 FAN FAIL MODULE 8 NOT USED 9 A C PANEL ILLUMINATION RESISTOR 10 START INHIBIT RELAY 11 A C PANEL ILLUMINATION RELAY 12 LAMBDA RELAY 13 REAR DEFOG TIMER 14 DOOR LOCK MODULE 15 DOOR LOCK CIRCUIT BREAKER 16 R P M RELAY 17 ACCESSORY RELAY 18 MAIN RELAY 19 FUSE PANEL 20 FAN SPEED CIRCUIT BREAKER 21 COOL FAN CIRCUIT BREAKER 22 A C OVERRIDE DIODE ...

Страница 95: ...e ignition switch is in position 2 By moving the switch to position 3 or start position power is supplied to the start inhibit relay which controls the operation of the starter motor The accessory relay is deactivated during the cranking process and will reactivate when the spring loaded ignition switch is released and returns to the run position The mam relay remains activated during cranking to ...

Страница 96: ...f T fWI I 5 ymr fflfll VF ff FWSJ b h Position 0 Off 1 Acc 2 Run 3 Start To Start Inhibit Relay PW F r o m K e y Buzzer J GROUNDED when key is fully inserted in switch N From Main Feed Wire HOT at all times MAIN RELAY W N_ WJ w 1 B ACCESSORY RELAY WU N WU WJ 1 B FUSES 9 1 0 11 1 3 1 6 IGNITION SWITCH CIRCUIT ...

Страница 97: ...tion when the system is turned off An electronic intermittent wipe control module is placed between the wiper switch and the motor to provide an intermittent wipe at slow speed An electric windshield washer pump supplies fluid to the windshield during the wash cycle Pushing inward on the end of the wiper switch arm activates both the pump and the wiper circuit The intermittent wipe control moduie ...

Страница 98: ...ROWN LGB LT GREEN BLACK RLG RED LT GREEN ULG BLUE LT GREEN NLG BROWN LT GREEN j F r o m Main Relay HOT when ignition switch is in Run or Start position f K 0 JOWASH WIPER WASHER SWITCH px WASHER PUMP TT WINDSHIELD WIPER WASHER CIRCUIT 100 ...

Страница 99: ...er motor operation When the wipers reach the park position the limit switch opens stopping current flow to the module This will stop wiper motor operation POSITION D This position is spring loaded and the switch lever will return to the O position when released Moving the switch lever to position D closed the contacts in the wiper switch allowing current to flow through the wiper control module to...

Страница 100: ...the washer fluid reservoir 4 The washer reservoir is mounted on the left front inner fender panel 5 The windshield wiper switch is part of the combination switch assembly which includes the turn signal switch Replacement of the combination switch assembly requires removal of the steering wheel 6 To diagnose a defective wiper control module disconnect the wiring harnesses from the module and connec...

Страница 101: ... activates either the high or low beam relays which in turn activate their respective circuits Each rear lamp cluster incorporates a direction indicator two stop lamps a tail lamp and a reverse lamp All of the bulb holders are located on a printed circuit board which is clipped to the rear of the lamp housing Other external lamps are the front direction indicator parking lamps located in the front...

Страница 102: ... US BLUE SLATE W N X From Main Feed Wire HOT at all times N NU To Fuse 2 and 8 f 7 fm fa f TT HEADLAMP CIRCUIT 1_High Low Beam Headlamps 2 High Beam Headlamps 3 Low Beam Relay 4 High Beam Relay 5 Main Light Switch 6 High Low Dimmer Switch 7 High and Low Beam Indicator Lamps 104 ...

Страница 103: ...oltage is applied to either of the relays that particular relay will energize and close the contacts connecting the main feed wire directly to the respective light circuit When the low beam relay 3 is energized current passes through fuse 14 in the main fuse box and on to the low beam filaments of the outer headlamps 1 only Power is also supplied to the low beam indicator lamp on the instrument pa...

Страница 104: ...ignition J switch is in Run or Start position jVyTo Right Directional Indicator Lamps To Left Directional Indicator Lamps r To Right and Left Rear Brake Indicator Lamps DIRECTIONAL INDICATOR AND BRAKE LIGHT CIRCUIT 1 Directional Indicator Combination Switch 2 D l Hazard Flasher Unit 3 Hazard Switch 4 Brake Light Switch 106 ...

Страница 105: ... the contacts are opened inside the hazard switch I BRAKE LIGHT CIRCUIT OPERATION Power is supplied to the brake light switch 4 by the 4 fused circuit from the main relay Whenever the brake pedal is depressed m the mechanical brake light switch closes the circuit allowing current to flow to the brake lamps The brake lamps are single filament bulbs and are not connected to the turn indicator m lamp...

Страница 106: ...BROWN GW GREEN WHITE GR GREEN RED 3From Main Feed Wire HOT at all times r T o Right Directional Indicator Lamps fSTo Left Directional Indicator Lamps HAZARD WARNING CIRCUIT 1 Directional Indicator Switch 2 D l Hazard Flasher Unit 3 Hazard Switch 108 j ...

Страница 107: ...ugh fuse 6 the closed contacts on the left side of the hazard switch 3 and on to the flasher unit 2 From the flasher unit the current flows through the closed contacts on the right side of the hazard switch 3 and on to the left and right directional indicator circuits The combination D I Hazard flasher unit 2 will be activated by the current flow and turn the circuit on and off intermittently Term...

Страница 108: ...vehicle The lamps can be turned on or off manually by using the switch on each lamp Athird position on the lamp allows them to operate automatically when one or both doors are opened When one of the switches is in this position an interior lamp delay unit is in the circuit to provide a delay period in the interior lighting after the doors are closed Each door is equipped with three lamps to provid...

Страница 109: ...E BLACK e O 6v A O O W o RIGHT DOOR LAMPS RIGHT DOOR SWITCH Door Closed W ys From Main Relay HOT when ignition N switch is in Run or Start position _ From Main Feed Wire HOT at all times P To Other Lamps FRONT INTERIOR LAMP Auto v7 PW REAR INTERIORT LAMP INTERIOR LAMP DELAY UNIT INTERIOR LAMP DIODE BLUE O PU e v9 i EFT DOOR LAMPS LEFT DOOR SWITCH Door Closed PU PW DOOR SWITCH DIODE RED PW i PU DOO...

Страница 110: ...amp switches in the auto position allows that lamp to operate by either door switch When a door is opened the door switch contact closes allowing current to flow in that circuit Current flow would be through fuse 12 the interior lamp bulb interior lamp diode door switch diode and to ground through the door switch The interior lamp diode is used to prevent the door ajar circuit from feeding back th...

Страница 111: ...luminate when one door is opened Feed back through the door ajar diode or interior lamp diode will cause the door ajar lamp to illuminate slightly with the doors fully closed 2 The interior lamp diode is located in the main wiring harness and is positioned at the left front corner of the center console The diode is color coded blue 3 The door ajar diode is located in the wiring harness behind the ...

Страница 112: ...ENGINE ADJUSTMENTS TESTS AND DIAGNOSIS r 1 115 ...

Страница 113: ... Ignition Timing 2 Idle Speed 3 CO Emission B System Operation Tests 1 Lambda i 2 Idle Speed Control C Diagnostic Charts H 1 Engine will not start Ignition System 2 Engine will not start Fuel System 3 Lambda System Troubleshooting m 4 Troubleshooting 116 ...

Страница 114: ...t vacuum hose at distributor advance and check to see there is not vacuum at the hose Reconnect hose to advance unit If vacuum is present at hose during idle speed diagnose malfunction in idle speed control system i e limit switch adjustment distributor vacuum cut off solenoid TVS switch STEP 4 Connect timing light to 1 cylinder and check ignition timing Set timing to 13 2 BTDC at curb idle 775 RP...

Страница 115: ...d Thecurb idlespeed is pre determined within the factory installed ECU module and cannot be altered The engine should idle at 775 RPM 50 during normal engine operating temperature This check is made with an external tachometer connected to the engine If there is excessive deviation from specification the Idle Speed Control System Operation Test B2 in this section should be performed P l j i 118 ...

Страница 116: ... between the terminals in the connectors The temperature switch is located on the coolant pipe left side of engine STEP 4 Remove both exhaust pipe plugs Plugs are located in left and right exhaust pipes at exhaust manifolds STEP 5 Install exhaust gas probes and valve assembly Tool No J28886 in plug locations Connect CO analyzer to probe and valve assembly STEP 6 Start engine and allow to warm up t...

Страница 117: ...dition 4 Refer to fuel injection Troubleshooting Chart C4 in this section and check for possible causes i e control pressure cold start valve leaking etc ADJUSTMENT PROCEDURE STEP 1 Perform Steps 1 6 of Engine CO Emission Check STEP 2 Stop engine STEP 3 Remove air sensor adjustment access hole plug located between the fuel distributor and air flow sensor on the mixture control unit STEP 4 Start en...

Страница 118: ...ive dwell lead is connected to the lower right corner terminal of the plug as viewed with the plug cover hinge on the right side The negative dwell lead is connected to the terminal directly above the positive as viewed with the plug cover hinge on the right Set the dwell meter to four 4 cylinder scale STEP 5 Disconnect Lambda oxygen sensor wire from under vehicle at underbody connection located a...

Страница 119: ... to 1500 RPM If CO now drops check for leaks in exhaust manifold or mixture control unit to inlet manifold gasket STEP 14 Depress full throttle microswitch with fingerto simulate full throttle condi tion The microswitch is located at the rear of the engine adjacent to the thermostat housing cover STEP 15 Check CO and dwell readings The CO percentage should increase and the dwell should be 50 to 60...

Страница 120: ...llow the procedure below STEP 1 Connect tachometer to engine STEP 2 Start engine and allow to warm up to normal operating temperature Read engine idle RPM Idle speed should be 775 RPM 50 STEP 3 Remove air cleaner and disconnect wire from idle speed microswitch STEP 4 Read engine idle RPM The RPM should increase Reconnect microswitch STEP 5 Stop engine Install air cleaner and remove tachometer If t...

Страница 121: ...ntrol operation k Shorted idle speed diode causing possible internal damage to idle speed ECU module by voltage feedback from distributor vacuum cut off solenoid I Idle speed ECU module malfunctioning m Malfunction in Fuel Injection or Lambda system r i WQ 125 ...

Страница 122: ...CHECK AND REMEDY AS NECESSARY Check 0 5 compensating resistor resistoi with single wire attached using ohmmetei Check ignition timing Check for flashover in coil insulator distributor cap rotor ignition leads and plugs Check fuel injection system Check that current flows to the compensating resistor blue yellow lead with starter crank ing With the starter cranking the voltage be tween this lead an...

Страница 123: ...ge insufficient The ECU module does not react to im pulse changes from the pulse generator with varying engine RPM Connect a voltmeter between pins 7 and 31 d of ECU module At cranking speed 100RPM a minimum reading of 1 0 volt A C should be obtained This indicates that impulses of suf ficient strength are being generated by the dis tributor If there is no or low voltage check the screened impulse...

Страница 124: ...ay By pass relay with jumper wire between terminal 87 and 30 in relay socket If fuel pump runs either RPM relay is defective or there is an open circuit between coil and terminal 31b on relay With RPM relay by passed check for voltage at black purple wire attached to inertia switch If none there is an open between RPM relay and pump or pump and inertia switch If there is voltage by pass inertia sw...

Страница 125: ...gs and engine fuel flooded Low engine compression Low secondary voltage Incorrect ignition timing Low primary fuel pressure Control pressure out of specification CHECK AND REMEDY AS NECESSARY Proceed to test 5 Allow thermo time switch to cool Coolant temp too high Check for voltage at cold start valve during cranking Check for open between cold start valve and thermo time switch Replace Switch Rep...

Страница 126: ...well still deviates from 40 50 spec _ Jt Open or short in wire from ECU terminal 17 to diagnostic connector Defective frequency valve winding Open or short in Lambda system wiring harness None Oxygen sensor defective Lambda thermal switch defective Full throttle microswitch misadjusted or defective Lambda ECU module defective CHECK AND REMEDY AS NECESSARY Proceed to test 2 Check meter hook up if o...

Страница 127: ...Dwell does not increase Dwell increases to a minimum of 87 PROBABLE FAULT Open or short in wire from ECU terminal 2 to oxygen sensor connector None CHECK AND REMEDY AS NECESSARY Check for continuity of wire from ECU terminal 2 to oxygen sensor connector If o k exchange Lambda ECU module Reconnect oxygen sensor connector dwull should return to 40 50 steady ...

Страница 128: ...ectly Sensor plate or control piston binding Leaks in air intake system General fuel system leaks Injection valves leak Idle CO adjustment too rich Idle CO adjustment too lean Injection valves not spraying properly Fuel accumulator leaks Seals in primary pressure valve or fuel pump leak Lambda E C U malfunction Lambda sensor malfunction Lambda full throttle micro switch malfunction Lambda thermal ...

Страница 129: ...HP psi t pai t r SPECIFICATIONS AND CAPACITIES 133 ...

Страница 130: ...0 15 mm 0 004 0 006 0 25 0 30 mm 0 010 0 012 775 50 r p m COOLING SYSTEM Type Thermostat begins open Thermostat fully open Radiator Position Cooling liquid Concentration Fans Positive pressure closed system 85 89 C 185 192 F 100 C 212 F Forward mounting Water ethylene glycol borax free 50 Anti freeze 50 Water Electrically operated Twin thermostatically controlled ELECTRICAL SYSTEM 12 Volt negative...

Страница 131: ...e Ducellier 80 amp Paris Rhone 50 60 amps 8 10 amps 8 volts Bosch electronic contactless 1 6 3 5 2 4 13 2 775 r p m 50 Bosch HR 6 DS 0 6 to 0 7 mm 0 024 to 0 028 17 5 to 20 NM 13 to 15 ft lb DISTRIBUTOR Direction of Rotation FUEL SYSTEM FUEL INJECTION Type Operation Line Pressure Injectors open at Rest Pressure Clockwise when viewed from top Bosch K Jetronic mechanical Continuous injection C I 5 2...

Страница 132: ... 2nd 2 059 3rd 1 381 Automatic 3 speed 1st 2 40 2nd 1 48 4th 5th Rev 3rd Rev 1 057 0 8205 3 1818 1 00 1 92 FINAL DRIVE MANUAL AND AUTOMATIC Transax ie Reduction Ratio CLUTCH Disc diameter Total pedal travel Maximum pedal load BRAKES Type Boost ratio Diameter of Vacuum servo Effective braking area front Effective braking area rear Double Universal Half Shafts 3 44 1 235 mm 9 25 150 mm 5 90 15 kg 33...

Страница 133: ...orbers and stabilizer bar Rear Diagonal trailing radius arms upper and lower links coil springs with telescopic shock absorbers 3mm 0 12 in per wheel 3y2o _ 4o posing 0 V20 negative non adjustable 8 V20 0 non adjustable 3mm 0 12 in per wheel 3 4 negative non adjustable Goodyear NCT low profile 60 aspect steel belt tubeless radial 195 60 HR 14 235 60 HR 15 T125 70 D15 Goodyear tubeless convenience ...

Страница 134: ...ront Track Rear Wheel Base Ground Clearance front Ground Clearance rear 23 PSI 30 PSI 60 PSI GENERAL INFORMATION Curb weight w full fuel tank Luggage capacity Ramp angle Approach angle Approx weight distribution R12 Freon Suniso 5GS oc Texaco Carpella E or equivalent 1 250 grammes 2 lb Sankyo SD 510 Inches 168 0 78 3 72 83 44 88 77 2 62 6 62 5 94 8 5 6 6 1 12 oz Millimeters 4267 1988 1850 1140 196...

Страница 135: ...C 4 F 20w 40 20w 50 10w 50 SAE 80 SAE 75 MIL L 2105C or API Service GL 5 API Service GL 5 NLGI No 2 Lithium Base DOT 3 or DOT 4 Ethylene Glycol Based Containing no borax with suitable corrosion inhibitors CAPACITIES Unit Engine crankcase drain and refill when changing filter add Cooling System Manual Transmission including final drive Final Drive automatic transmission only Fuel Tank 91 Octane onl...

Страница 136: ...NOTES r r r r r r r r r r r r r 141 ...

Страница 137: ...NOTES 142 1 1 1 1 ...

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Delorean DMC-12 1981, Техническое руководство

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