Inspection Procedure 38: A/C Compressor Relay System




OPERATION



FUNCTION



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-207 A/C compressor relay connector

Q. Is the check result normal?

Go to Step 2 .

Repair or replace the connector.

STEP 2. Check A/C compressor relay itself.

  • Check A/C compressor relay itself (Refer to GROUP 55A - On-vehicle Service - Relay Check ).

Q. Is the check result normal?
Go to Step 3 .
Replace the A/C compressor relay.

STEP 3. Perform voltage measurement at B-207 A/C compressor relay.


  • Disconnect connector, and measure at J/B side.
  • Voltage between terminal No. 3 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 4 .


    Check intermediate connectors B-231, B-118, B-212 and B-208, and repair if necessary. If intermediate connectors are normal, check and repair harness between battery and B-207 (terminal No. 3) A/C compressor relay connector.

    • Check power supply line for open/short circuit.

STEP 4. Check harness between battery and B-207 (terminal No. 3) A/C compressor relay connector.

note Before checking harness, check intermediate connectors B-231, B-118, B-212 and B-208, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 5 .

Repair the damaged harness wire.

STEP 5. Perform voltage measurement at B-207 A/C compressor relay.


  • Disconnect connector, and measure at harness side.
  • Voltage between terminal No. 1 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 7 .

Go to Step 6 .

STEP 6. Connector check: B-240 ignition switch connector


Q. Is the check result normal?


    Check intermediate connectors B-231 and B-230, and repair if necessary. If intermediate connectors are normal, check and repair harness between B-240 ignition switch connector (terminal No. 4) and B-207 (terminal No. 1) A/C compressor relay connector.

    • Check power supply line for open/short circuit.

Repair or replace the connector.

STEP 7. Check harness between B-240 (terminal No. 4) ignition switch connector and B-207 (terminal No. 1) A/C compressor relay connector.


note Before checking harness, check intermediate connectors B-231 and B-230, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 8 .

Repair the damaged harness wire.

STEP 8. Connector check: A-09 engine-ECU or engine-A-M/T-ECU connector

Q. Is the check result normal?

Go to Step 9 .

Repair or replace the connector.

STEP 9. Perform voltage measurement at A-09 engine-ECU or engine-A-M/T-ECU connector.



  • Disconnect connector, and measure at harness side.
  • Voltage between terminal No. 95 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 10 .


    Check intermediate connectors B-231 and B-118, and repair if necessary. If intermediate connectors are normal, check and repair harness between B-207 (terminal No. 2) A/C compressor relay connector and A-09 (terminal No. 95) engine-ECU or engine-A-M/T-ECU connector.

    • Check signal line for open/short circuit.

STEP 10. Check harness between B-207 (terminal No. 2) A/C compressor relay connector and A-09 (terminal No. 95) engine-ECU or engine-A-M/T-ECU connector.


note Before checking harness, check intermediate connectors B-231 and B-118, and repair if necessary.

  • Check signal line for damage.

Q. Is the check result normal?

Go to Step 11 .

Repair the damaged harness wire.

STEP 11. Connector check: B-124 A/C compressor assembly connector



Q. Is the check result normal?

Go to Step 12 .

Repair or replace the connector.

STEP 12. Check harness between B-207 (terminal No. 4) A/C compressor relay connector and A-124 (terminal No. 1) A/C compressor assembly connector.


note Before checking harness, check intermediate connectors B-231, B-118 and A-13, and repair if necessary.

  • Check power supply line for open/short circuit and damage.

Q. Is the check result normal?

Go to Step 13 .

Repair the damaged harness wire.

STEP 13. Check harness between B-207 (terminal No. 1) A/C compressor relay connector and B-27 diode.


note Before checking harness, check intermediate connectors B-231 and B-118, and repair if necessary.

  • Check power supply line for short circuit.

Q. Is the check result normal?

Go to Step 14 .

Repair the damaged harness wire.

STEP 14. Check A/C compressor clutch operating conditions.

  • Disconnect A-09 engine-ECU or engine-A-M/T-ECU connector, and short-circuit terminal No. 95 to the earth.
OK: A/C compressor clutch operates.

Q. Is the check result normal?
Replace the engine-ECU or engine-A-M/T-ECU.
Replace the A/C compressor assembly.