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AIR CONDITIONING
02 - Locating A/C Protection Devices

Activity02-2

TC070-15-01H

Pressure Relief Valve

1. Where is this device located?

2. At what pressure will you expect the pressure relief valve to discharge refrigerant

to the atmosphere?

Instructor Sign-Off:

Now that you have completed this activity, you should be able to:

locate A/C system protection devices

explain the function of protection devices

This skill will help you evaluate protection devices for correct operation.

Instructor’s initials:

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Содержание TC070-15-01H

Страница 1: ...L LE EV VE EL L 1 1 Air Conditioning Operation Diagnosis T TC C0 07 70 0 1 15 5 0 01 1H H Student Guide Mazda Motor Corporation Technical Service Training...

Страница 2: ...you have learnt so far and get information from relevant service materials such workshop manual and wiring diagram NOTE This course is developed based on the service materials of Mazda 3 included in t...

Страница 3: ...01 Basic System Activity01 Identifying A C Components Activity02 Locating A C Protection Devices Activity03 A C performance Check Activity04 Refrigerant Charging SG02 Control System Manual Air conditi...

Страница 4: ...ices Refrigerant Pressure Check SG Activity Workshop 14 50 15 00 Break 15 00 17 00 Performance Check SG Activity Workshop Day 2 Time Session Remark 8 30 9 50 Control System SG Classroom 9 50 10 00 Bre...

Страница 5: ...high pressure vapor Technician B says at point E in this illustration the refrigerant is a low pressure vapor Who is correct a Technician A b Technician B c Both Technicians d Neither technician 3 On...

Страница 6: ...dding heat Technician B says the compressor raises the pressure of the vaporized refrigerant and not the temperature Who is correct a Technician A b Technician B c Both Technicians d Neither technicia...

Страница 7: ...frigerant is a High pressure liquid b High pressure vapor c Low pressure liquid d Low pressure vapor 11 Technician A says R 12 and R 134a system have different sized service valves to prevent accident...

Страница 8: ...erating A C system Who is correct a Technician A b Technician B c Both Technicians a Neither technician 14 Technician A says after repairs have been performed or if a system has been open for a long p...

Страница 9: ...tem Technician B says if the refrigerant has leaked out of an A C system the technician should charge the system with a small amount of refrigerant for leak testing purposes Who is correct a Technicia...

Страница 10: ...t SG00b 6 TC070 15 01H 20 Which statement is true about this climate control plenum assembly a All air passes through the evaporator b The air is being re circulated c The temperature blend door is se...

Страница 11: ...Shop AC02 Locating A C Protection Devices Shop AC03 A C performance Check Shop AC04 Refrigerant Charging Shop In this section Basic System A C Components 2 A C Unit construction operation 3 Evaporator...

Страница 12: ...AIR CONDITIONING SG01 Basic System SG01 2 TC070 15 01H A C Components Name the components...

Страница 13: ...ansion valve 4 Air intake door 5 Air mix door 6 Airflow mode door 7 Evaporator temperature sensor 8 Resistor manual air conditioner 9 Power MOS FET full auto air conditioner 10 Air intake actuator 11...

Страница 14: ...ing angle of the ball valve in the expansion valve Opening angle is adjusted by a balance of the R 134a pressure Pd in the diaphragm and a composite force of evaporator discharge pressure PI against t...

Страница 15: ...HOT or COLD position depending on the position of the temperature control dial As a result airflow distribution changes and the airflow temperature is controlled Airflow Mode Door Operation The airflo...

Страница 16: ...been added The air filter cannot be reused and must be replaced periodically NOTE Even new air filters are gray be careful not to mistake the gray color as dirt A C compressor A rotary vane type H12A...

Страница 17: ...s refrigerant initially cooled at the condenser via the receiver drier where it returns again to the condenser sub cooling part and is cooled accelerating liquefaction and improving cooling capacity R...

Страница 18: ...e cooler pipe or cooler hose LO of spring lock coupling type and the end of the pipe on the female side A C unit is flared When the pipes are being connected the flared end of the female side forces t...

Страница 19: ...tem SG01 9 TC070 15 01H Gauge manifold reading Normal LO 0 15 0 25 MPa HI 1 37 1 57 MPa It may vary under the different condition A B C A Insufficient refrigerant B Excessive refrigerant or insufficie...

Страница 20: ...nguish or remove the above mentioned heat sources and maintain adequate ventilation Handling liquid refrigerant is dangerous A drop of it on the skin can result in localized frostbite When handling th...

Страница 21: ...If moisture mixes with the compressor oil the refrigerant system could be damaged Therefore install caps immediately after using the compressor oil or removing refrigerant system parts to prevent moi...

Страница 22: ...h 4 550 3 913 Cooling capacity kW kcal h 3 960 3 406 Refrigerant Type R 134a Regular amount approx quantity g oz 525 18 5 A C compressor Type Vane rotary Discharge capacity ml cc fl oz 120 120 4 06 Ma...

Страница 23: ...AIR CONDITIONING SG01 Basic System SG01 13 TC070 15 01H Review Exercise 1 Name the components...

Страница 24: ...ystem SG01 14 TC070 15 01H 2 Explain the function of the Airflow Mode Door 3 Explain the function of the Air Mix Door 4 Explain the function of the Air Filter 5 Explain the purpose of the Thermal Prot...

Страница 25: ...CONDITIONING SG01 Basic System SG01 15 TC070 15 01H 6 In this example match the gauge reading with the possible condition Compressor Failure Insufficient refrigerant Excessive refrigerant Normal A B...

Страница 26: ...refer to the Workshop Manual 1 6 2 7 3 8 4 9 5 10 Visual Inspection 1 Do the condenser and radiator have any obstructions to airflow Yes No NOTE Perform the following checks with engine off and key o...

Страница 27: ...ns was no fix the problem before continuing the inspection Visual and component inspection help isolate the concern to a specific system Instructor Sign Off Now that you have completed this activity y...

Страница 28: ...erant Pressure Switch 1 Where is the pressure switch located 2 How does it protect a system that has a leak in the condenser 3 How does it protect a system that has inoperative condenser fans 4 Is the...

Страница 29: ...e will you expect the pressure relief valve to discharge refrigerant to the atmosphere Instructor Sign Off Now that you have completed this activity you should be able to locate A C system protection...

Страница 30: ...rge Set Safety Glasses NOTE Humidity and temperature have an effect on the outcome of this test Function Check NOTE During the following tests monitor instrument panel gauges and warning lights for ou...

Страница 31: ...re This is because the evaporator is concentrated in the small area of the duct very close to the evaporator Gauge Installation Install R 134a Refrigerant Pressure Gauge Set according to the workshop...

Страница 32: ...ture 7 Verify that the intersection of the pressure reading of the pressure gauge and ambient temperature is in the shaded zone Performance Check 1 Place a dry bulb thermometer in the driver side cent...

Страница 33: ...on inspect the refrigerant system according to the troubleshooting chart in the Workshop Manual NOTE It is acceptable for outlet temperatures to be cooler than the specification If you perform the tes...

Страница 34: ...Performance Check SG03 5 TC070 15 01H Instructor Sign Off Now that you have completed this activity you should be able to conduct A C performance checks This skill will help you accurately diagnose an...

Страница 35: ...B Gas Charge Set Vacuum Pump Electronic Leak Detector Safety Glasses NOTE Do not exceed the specification when charging the system with refrigerant Doing so will decrease the efficiency of the air con...

Страница 36: ...760 mmHg 29 9 inHg Close each valve Air tightness Check 1 Stop the vacuum pump and wait for 5 min 2 Check the high and low pressure side readings of the gauge If the reading has changed inspect for le...

Страница 37: ...om the cooler pipe hose connections If leakage is found at a loose joint tighten the joint then inspect for leakage again 6 Open the high pressure side valve and charge with refrigerant until the weig...

Страница 38: ...ant Charging SG04 4 TC070 15 01H Instructor Sign Off Now that you have completed this activity you should be able to perform A C refrigerant charging This skill will help you properly charge the refri...

Страница 39: ...ctivities Activity Title Description Location AC 05 Units and parts checks Shop AC 06 Symptom troubleshooting Shop What s in this section Control System Manual Air Conditioner 2 Control System Full au...

Страница 40: ...ontrol System Manual Air Conditioner Structural View Mazda 3 1 Air intake actuator 2 Blower motor 3 Resistor 4 Magnetic clutch Z6 5 Magnetic clutch LF 6 Evaporator temperature sensor 7 Refrigerant pre...

Страница 41: ...nditioner 1 Air intake actuator 2 Air mix actuator 3 Airflow mode actuator 4 Blower motor 5 Power MOS FET 6 Magnetic clutch Z6 7 Magnetic clutch LF 8 Solar radiation sensor 9 Ambient temperature senso...

Страница 42: ...0 15 01H Control System Wiring Diagram Manual Air Conditioner 1 Blower relay 2 Blower motor 3 Resistor 4 Air intake actuator 5 Evaporator temperature sensor 6 A C relay 7 Magnetic clutch 8 Refrigerant...

Страница 43: ...beep sounds use the range of your multi meter to check resistance ohm when you check continuity between the terminals B and D This is because your multi meter may determine there is a malfunction due...

Страница 44: ...o the blower motor therefore the lower the revolution of the blower motor Provided the measurements are as shown in the table 1 what do you assume resistance of each register Complete the table 2 Tabl...

Страница 45: ...e evaporator surface temperature within the specified range to prevent the evaporator from being frosted Look at the chart below Control Reference Value The predetermined value t1 must be above freezi...

Страница 46: ...ted from the control system wiring diagram And the right one is a rearranged diagram of the circuit The evaporator temperature sensor is grounded through the climate control unit The circuit operates...

Страница 47: ...g the continuities It requires supplying battery voltage Magnetic clutch Mazda 3 Z6 ZY Mazda 3 LF L3 1 Bolt 2 Pressure plate 3 Shim 4 Snap ring 5 A C compressor pulley 6 Screw 7 Clamp 8 Screw 9 Stator...

Страница 48: ...itioning SG02 10 TC070 15 01H A bimetallic Indirect sensing type type thermal protector is shown in the figure below 1 Thermal protector Mazda 3 Magnet clutch function can be checked by directly apply...

Страница 49: ...r abnormally high or low The medium pressure switch outputs an idling increase signal according to the A C compressor operation load Why do you think the system needs to cut the A C signal when pressu...

Страница 50: ...w Its function can be verified by checking the continuity between the terminals at a given status of switch position as shown in the table below Climate control unit A wire type climate control unit i...

Страница 51: ...ctor dial 3 Airflow volume control dial 4 Temperature control dial 5 A C switch 6 REC FRESH switch 7 Rear window defroster switch Block Diagram The climate control unit sends an A C signal to the PCM...

Страница 52: ...osition a wire moves the airflow mode main link turning the airflow mode to DEFROSTER 2 The defroster switch turns on at the same time and the CPU sends a signal to turn the air intake mode to FRESH 3...

Страница 53: ...it sends an A C signal to the PCM via the main fuse block and instrument cluster PJB and instrument cluster based on signals sent from the A C switch fan switch and evaporator temperature sensor The P...

Страница 54: ...te control unit inspection Reference 1 Turn the ignition switch to the ON position 2 Connect the negative lead of the tester to body ground 3 By inserting the positive lead of the tester into each cli...

Страница 55: ...AIR CONDITIONING SG02 Control System Manual Air Conditioning SG02 17 TC070 15 01H Cont d...

Страница 56: ...AIR CONDITIONING SG02 Control System Manual Air Conditioning SG02 18 TC070 15 01H Technical Data...

Страница 57: ...ses 1 Refer to the illustration and place the number of each component by the correct description Air Intake actuator Resistor Evaporator temperature sensor Main fuse block Blower relay Climate contro...

Страница 58: ...nual Air Conditioning SG02 20 TC070 15 01H 2 In the above manual wiring diagram identify the components and place the number beside the correct description Blower Relay Air Intake Actuator Blower Moto...

Страница 59: ...ditioning SG02 21 TC070 15 01H 3 Describe the operation of the blower motor resistor 4 Describe the function of the Air Intake Actuator 5 Describe the function of the Evaporator Temperature Sensor 6 D...

Страница 60: ...model vehicle Workshop Manual or Body Electrical Trouble Shooting Manual DVOM Digital Volts Ohm Meter NOTE Most of units and parts can be checked individually To avoid any damage on vehicle it is reco...

Страница 61: ...hm Condition OK NG A B ohm Condition OK NG A C ohm Condition OK NG Air intake actuator Check the air intake actuator for its function by directly applying the battery voltage C B G Ground Operation OK...

Страница 62: ...ify the high pressure side reading of the manifold gauge and continuity between the refrigerant pressure switch terminals Continuity OK NG at psi Fan switch Remove the climate control unit Verify that...

Страница 63: ...at 1st M A C PJB A C switch OFF N Evaporator temperature sensor input Evaporator temperature sensor Compared with temperature detected by evaporator temperature sensor Rear window defroster switch ON...

Страница 64: ...cks SG05 5 TC070 15 01H Instructor Sign Off Now that you have completed this activity you should be able to Perform checks for A C components This skill will help you evaluate protection devices for c...

Страница 65: ...d approach What you will need to complete this activity Current model vehicle Workshop Manual or Body Electrical Trouble Shooting Manual DVOM Digital Volts Ohm Meter NOTE The purpose of this activity...

Страница 66: ...er Malfunction in blower system 4 Air intake mode does not change Air intake mode does not change when switching REC FRESH mode 5 No temperature control with climate control unit Malfunction in A C un...

Страница 67: ...coil inside the A C relay to close the contact of the relay Magnetic clutch is grounded through its body an open circuit between Magnetic clutch and ground is unlikely occurred If the magnetic clutch...

Страница 68: ...the circuit of the A C relay to supply power activating the magnetic clutch 1 A C switch ON OFF 2 Fan switch OFF position Other than OFF position 1 2 3 or 4 3 Evaporator temperature sensor V or more...

Страница 69: ...to the next step 3 INSPECT A C COMPRESSOR OPERATION Start the engine Turn the A C switch and fan switch on Does the A C compressor operate Yes Go to Step 1 of troubleshooting index No 7 No Go to the...

Страница 70: ...Total score Description Procedure Remarks Results Score Instructor Sign Off Now that you have completed this activity you should be able to Isolate trouble cause based on Symptom based approach This...

Страница 71: ...terials are subject to the copyrights and other intellectual property rights of Mazda Motor Corporation its affiliated companies and its licensors These materials may not be copied processed sold insp...

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