Inspection Procedure 4
When the A/C is Operating, Temperature Inside the Passenger Compartment does not Decrease (Cool Air is not Emitted). <2.0 L>A/C Compressor And Air Thermo Sensor Circuit Part 1:
A/C Compressor And Air Thermo Sensor Circuit Part 2:
A/C Compressor And Air Thermo Sensor Circuit Part 3:
TECHNICAL DESCRIPTION (COMMENT)
If cool air is not distributed when the A/C switch is on, the air thermo sensor or the A/C compressor clutch relay system may be defective.
TROUBLESHOOTING HINTS
- Malformation of the air thermo senor
- Malformation of the dual pressure switch
- Malformation of the A/C compressor clutch relay
- Malformation of the A/C refrigerant temperature switch
- Malformation of the A/C/ compressor clutch
- Malformation of the A/C- ECU
- Malformation of the ECM or PCM
DIAGNOSIS
Required Special Tool:
- MB991223: Test Harness Set
STEP 1. Check the defogger and outside/inside air selection damper control motor operation.
Q: Do the defogger and outside/inside air selection damper control motor work normally?
YES: Go to Step 2.
NO: Refer to Inspection procedure 10 "Malfunction does not operate."
STEP 2. Check the blower motor operation.
Q: Does the blower motor work normally?
YES: Go to Step 3.
NO: Refer to Inspection procedure 6 "Blower Fan and motor does not tern."
STEP 3. Check A/C compressor clutch relay connector B-13X for damage.
Q: Is A/C compressor clutch relay connector B-13X in good condition?
YES: Go to Step 4.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 4. Check the A/C compressor clutch relay continuity. Follow the table to check the A/C compressor clutch relay for continuity.
Q: Is the A/C compressor clutch relay in good conditioning
YES: Go to Step 5.
NO: Replace the A/C compressor clutch relay. Check that the air conditioning works normally.
STEP 5. Check A/C compressor connector B-115 and engine control module connector C-121
Q: Are A/C compressor connector B-115 and engine control module connector C-121
YES: Go to Step 6.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 6. Measure the voltage at A/C compressor connector B-115.
1. Disconnect A/C compressor connector B-115 and measure the voltage at the harness side.
2. Disconnect engine control module connector C-121 and ground harness side terminal No.22.
3. Disconnect powertrain control module connector C-120 and ground harness side terminal No.21.
4. Turn the ignition switch to the "ON" position.
5. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 14.
NO: Go to Step 7.
STEP 7. Measure the voltage at A/C compressor clutch relay connector B-13X.
1. Disconnect A/C compressor connector B-13X and measure the voltage at the relay box side.
2. Turn the ignition switch to the "ON" position.
3. Measure the voltage between terminal 2 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 9.
NO: Go to Step 8.
STEP 8. Check the wiring harness between A/C compressor clutch relay connector B-13X (terminal 2) and the ignition switch (IG2).
NOTE: Also check intermediate connector C-122, joint con or (2) C-101, junction block connectors C-210 and C-211. intermediate connector C-122, joint connector (2) C-101, or unction block connectors C-210 or C-211 is damaged, replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between A/C compressor clutch relay connector B-13X (terminal 2) and the ignition switch (IG2) in good condition?
YES: It can be assumed that this malfunction is intermitten Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 9. Measure the voltage at A/C compressor clutch relay connector B-13X.
1. Disconnect A/C compressor connector B-13X and measure the voltage at the relay box side.
2. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 11.
NO: Go to Step 10.
STEP 10. Check the wiring harness between A/C compressor clutch relay connector B-13X (terminal 1) and the battery.
NOTE: Also check intermediate connector A-13. If intermediate connectors A-13 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between A/C compressor clutch relay connector B-13X (terminal 1) and the battery in good condition?
YES: Check that the air conditioning works normally.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 11. Check the wiring harness between A/C compressor clutch relay connector B-13X (terminal 4) and A/C compressor connector B-115 (terminal 1).
Q: Is the wiring harness between A/C compressor clutch relay connector B-13X (terminal 4) and A/C compressor connector B-115 (terminal 1) in good condition?
YES
YES : Go to Step 13.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 12. Check the wiring harness between engine control module connector C-121 (terminal 22) and A/C compressor clutch relay connector B-13X (terminal 3).
Q: Is the wiring harness between engine control module connector C-121 (terminal 22) and A/C compressor clutch relay connector B-13X (terminal 3) in good condition?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 13. Check the wiring harness between powertrain control module connector C-120 (terminal 21) and A/C compressor clutch relay connector B-13X (terminal 3).
Q: Is the wiring harness between powertrain control module connector C-120 (terminal 21) and A/C compressor clutch relay connector B-13X (terminal 3) in good condition?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Mollifications.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 14. Check A/C-ECU connector C-16 for damage.
Q: Is A/C-ECU connector C-16 in good condition?
YES: Go to Step 15.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 15. Measure the voltage at A/C-ECU connector C-16.
1. Disconnect A/C-ECU connector C-16 and measure the voltage at the harness side.
2. Turn the ignition switch to the "ON" position.
3. Turn the blower switch to the "ON" position.
4. Measure the voltage between terminal 8 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 18.
NO: Go to Step 16.
STEP 16. Check blower switch connector C-125 for damage.
Q: Is blower switch connector C-125 in good condition?
YES: Go to Step 17.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 17. Check the wiring harness between blower switch connector C-125 (terminal 1) and A/C-ECU connector C-16 (terminal 8).
Q: Is the wiring harness between blower switch connector C-125 (terminal 1) and A/C-ECU connector C-16 (terminal 8) in good condition?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 18. Check air thermo sensor connector C-10 for damage.
Q: Is air thermo sensor connector C-10 in good condition?
YES: Go to Step 19.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 19. Check the air thermos sensor (outlet side)
1. Measure the resistance between air thermo sensor (outlet side) terminal numbers 4 and 5 at two points or more.
2. Check that the measured value corresponds with approximately the shown value.
Q: Is the air thermos sensor (outlet side) in good condition?
YES: Go to Step 20.
NO: Replace the air thermo sensor. Check that the air conditioning works normally.
STEP 20. Check the air thermo sensor (inlet side)
1. Measure the resistance between air thermo sensor (inlet side) terminal numbers 1 and 3 at two points or more.
2. Check that the measured value corresponds with approximately the shown value.
Q: Is the air thermo sensor (inlet side) in good condition?
YES: Go to Step 21.
NO: Replace the air thermo sensor. Check that the air conditioning works normally.
STEP 21. Check the wiring harness between air thermo sensor connector C-10 (terminals 1, 3, 4 and 5) and A/C-ECU connector C-16 (terminals 14, 16 and 13).
Q: Are the wiring harness between air thermo sensor connector C-10(terminals 1, 3, 4 and 5) and A/C-ECU connector C-16 (terminals 14, 16 and 13) in good condition?
YES: Go to Step 22.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 22. Check dual pressure switch connector A-25 for damage.
Q: Is dual pressure switch connector A-25 in good condition?
YES: Go to Step 23.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 23. Check the dual pressure switch operation.
1. Remove the dual pressure switch connector and connect the high/low pressure side terminals located on the harness side as shown in the illustration.
2. Install a gauge manifold to the high-pressure side service valve of the refrigerant line.
3. When the high/low pressure sides of the dual pressure switch are at operation pressure (ON), the resistance should less than two ohms between the terminals, If open circuit, replace the switch.
Q: Is the dual pressure switch operating properly?
YES: Go to Step 24.
NO: Replace the dual pressure switch. Check that the air conditioning works normally.
STEP 24. Check the wiring harness between dual pressure switch connector A-25 (terminal 2) and A/C-ECU connector C-16 (terminal 4)
NOTE: Also check intermediate connector C-111. If intermediate connectors C-111 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between dual pressure switch connector A-25 (terminal 2) and A/C-ECU connector C-16 (terminal 4) in good condition?
YES
YES : Go to Step 28.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 25. Check engine control module connector C-119 for damage.
Q: Is engine control module connector C-119 in good condition
YES: Go to Step 26.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 26. Check the wiring harness between dual pressure switch connector A-25 (terminal 1) and engine control module connector C-119 (terminal 45).
NOTE: Also check intermediate connectors C-111 and C-122. If intermediate connectors C-111 and C-122 are damaged, repair or replace the connector as described Harness Connector Inspection.
Q: Is the wiring harness between dual pressure switch connector A-25 (terminal 1) and engine control module connector C-119 (terminal 45) in good condition?
YES: Go to Step 27.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 27. Check the wiring harness between A/C-ECU connector C-16 (terminal 5) and engine control module connector C-121 (terminal 24).
NOTE: Also check intermediate connector C-122. If intermediate connector C-122 is damaged, repair or replace the connector as described Harness Connector Inspection.
Q: Is the wiring harness between A/C-ECU connector C-16 (terminal 5) and engine control module connector C-121 (terminal 24) in good condition?
YES: Go to Step 32.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 28. Check powertrain control module connector C-116 for damage.
Q: Is powertrain control module connector C-116 in good condition?
YES: Go to Step 29.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 29. Check the wiring harness between dual pressure switch connector A-25 (terminal 1) and powertrain control module connector C-116 (terminal 83).
NOTE: Also check intermediate connectors C-111 and C-122. If intermediate connectors C-111 or C-122 are damaged, repair or replace the connector as described Harness Connector Inspection.
Q: Is the wiring harness between dual pressure switch connector A-25 (terminal 1) and powertrain control module connector C-116 (terminal 83) in good condition?
YES: Go to Step 30.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 30. Check powertrain control module connector C-118 for damage.
Q: Is powertrain control module connector C-118 in good condition?
YES: Go to Step 31.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the air conditioning works normally.
STEP 31. Check the wiring harness between A/C-ECU connector C-16 (terminal 5) and powertrain control module connector C-118 (terminal 61).
NOTE: Also check intermediate connector C-122. If intermediate connector C-122 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between A/C-ECU connector C-16 (terminal 5) and powertrain control module connector C-118 (terminal 61) in good condition?
YES: Go to Step 32.
NO: Repair the wiring harness. Check that the air conditioning works normally.
STEP 32. Check the A/C compressor clutch operation. Connect the positive battery terminal to the compressor a/c compressor clutch connector terminal and ground the battery (-) terminal to the body of the compressor.
Q: Can the sound of the A/C compressor clutch (click) be heard?
YES: Go to Step 33.
NO: Replace the compressor magnet clutch. Check that the air conditioning works normally.
STEP 33. Check the refrigerant temperature switch.
CAUTION: Does not heat the sensor probe than necessary.
1. Immerse the refrigerant temperature sensor probe into engine oil to heat the sensor probe.
2. If the oil temperature reaches the standard value, there should be continuity between the switch terminals.
Q: Is the refrigerant temperature switch operating properly?
YES: Go to Step 34.
NO: Replace the refrigerant temperature switch. Check that the air conditioning works normally.
STEP 34. Check the refrigerant level.
Q: Is the refrigerant level correct?
YES: Go to Step 35.
NO: Correct the refrigerant level. (Refer to On-vehicle Service). Check that the air conditioning works normally.
STEP 35. Replace the A/C-ECU.
Q: Do the air conditioning work normally?
YES: No action is necessary and testing is complete.
NO: Replace the engine control module