Inspection Procedure 25: A/C condenser fan relay system














OPERATION



  • The battery voltage is applied to the A/C condenser fan relay coil (terminal No. 3) from the ignition switch.
  • The engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 17) turns on the switch of the power transistor on the unit, and then turns on the switch of the relay by applying the electrical current to the A/C condenser fan relay coil.
  • When the A/C condenser fan relay is in ON position, the battery voltage is applied to the A/C condenser fan motor (terminal No. 1) from the A/C condenser fan relay (terminal No. 4).

FUNCTION



  • When the A/C condenser fan relay is in ON position, the fan motor rotates.

PROBABLE CAUSES



  • Failed A/C condenser fan relay
  • Failed A/C condenser fan motor
  • Open/short circuit in A/C condenser fan relay circuit or loose connector contact
  • Failed engine-ECU <M/T> or engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE


STEP 1. Connector check: A-10X A/C condenser fan relay connector


Q. Is the check result normal?

Go to Step 2 .
Repair or replace the connector.

STEP 2. Check A/C condenser fan relay.



  • Check A/C condenser fan relay (Refer to GROUP 55 - On-vehicle Service - Relay Continuity Check ).

Q. Is the check result normal?

Go to Step 3 .
Replace the A/C condenser fan relay.

STEP 3. Connector check: A-29 A/C condenser fan motor connector


Q. Is the check result normal?

Go to Step 4 .
Repair or replace the connector.

STEP 4. Check A/C condenser fan motor.



  • Check A/C condenser fan motor (Refer to GROUP 55 - Condenser Assembly - Inspection ).

Q. Is the check result normal?

Go to Step 5 .
Replace A/C condenser fan motor.

STEP 5. Perform voltage measurement at A-10X A/C condenser fan relay connector.



  • Disconnect connector and measure at harness side.
  • Voltage between terminal No. 5 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 6 .

    Check intermediate connector A-14, and repair if necessary. If intermediate connector is normal, check and repair harness between A-10X (terminal No. 5) A/C condenser fan relay connector and battery.

    • Check power supply line for open/short circuit.

STEP 6. Perform voltage measurement at A-10X A/C condenser fan relay connector.



  • Disconnect connector and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 3 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 8 .
Go to Step 7 .

STEP 7. Connector check: D-309 ignition switch connector


Q. Is the check result normal?


    Check intermediate connectors D-37, D-241, D-401 and D-403, and repair if necessary. If intermediate connectors are normal, check and repair harness between A-10X (terminal No. 3) A/C condenser fan relay connector and D-309 (terminal No. 4) ignition switch connector.

    • Check power supply line for open/short circuit.
Repair or replace the connector.

STEP 8. Check harness between battery and A-10X (terminal No. 5) A/C condenser fan relay connector.


note Before checking harness, check intermediate connector A-14, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 9 .
Repair the damaged harness wire.

STEP 9. Check harness between D-309 (terminal No. 4) ignition switch connector and A-10X (terminal No. 3) A/C condenser fan relay.


note Before checking harness, check intermediate connectors D-37, D-241, D-401 and D-403, and repair if necessary.

  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 10 .
Repair the damaged harness wire.

STEP 10. Connector check: D-243 engine-ECU <M/T> connector or D-212 engine-A/T-ECU <A/T> connector


Q. Is the check result normal?

Go to Step 11 .
Repair or replace the connector.

STEP 11. Perform voltage measurement at D-243 engine-ECU <M/T> connector or D-212 engine-A/T-ECU <A/T> connector.



  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 17 and earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 12 .

    Check intermediate connector A-03, and repair if necessary. If intermediate connector is normal, check and repair harness between A-10X (terminal No. 1) A/C condenser fan relay connector and D-243 (terminal No. 17) engine-ECU <M/T> connector or D-212 (terminal No. 17) engine-A/T-ECU <A/T> connector.

    • Check signal line for open/short circuit.

STEP 12. Check harness between A-10X (terminal No. 1) A/C condenser fan relay connector and D-243 (terminal No. 17) engine-ECU <M/T> connector or D-212 (terminal No. 17) engine-A/T-ECU <A/T> connector.


note Before checking harness, check intermediate connector A-03, and repair if necessary.

  • Check signal line for damage.

Q. Is the check result normal?

Go to Step 13 .
Repair the damaged harness wire.

STEP 13. Perform resistance measurement at A-29 A/C condenser fan motor connector.



  • Disconnect connector and measure at harness side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?


    Go to Step 14 .

    Check and repair harness between A-29 (terminal No. 2) A/C condenser fan motor connector and earth.

    • Check earthing line for open circuit and damage.

STEP 14. Check harness between A-29 (terminal No. 1) A/C condenser fan motor connector and A-10X (terminal No. 4) A/C condenser fan relay connector.



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

Q. Is the check result normal?

Go to Step 15 .
Repair the damaged harness wire.

STEP 15. M.U.T.-III actuator test



  • Refer to Actuator Test Reference Table .

  1. Item 13: A/C condenser fan motor

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.