Inspection Procedure 1: Radiator Fan and Condenser Fan do not Operate

OPERATION

Battery voltage is applied to the radiator fan relay (terminal No.3), fan control relay (terminal No.1), and condenser fan relay (terminal No.3).
ETACS-ECU (terminal Nos.2, 8, and 9) turns ON the power transistor in the unit to apply current to the radiator fan relay, fan control relay, and condenser fan relay, thus turning ON the relays.
When the radiator fan relay is turned ON and the fan control relay is also turned ON, battery voltage is applied from the radiator fan relay (terminal No.2) to the radiator fan motor (terminal No.1).
When the condenser fan relay is turned ON, battery voltage is applied from the condenser fan relay (terminal No.2) to the condenser fan motor (terminal No.1).

FUNCTION

When the radiator fan relay is turned ON, the radiator fan motor and condenser fan motor rotate at a low speed.
When the radiator fan relay, fan control relay, and condenser fan relay are turned ON, the radiator fan motor and condenser fan motor rotate at a high speed.

PROBABLE CAUSES

Malfunction of fusible link No.28
Malfunction of fusible link No.29
Malfunction of radiator fan relay
Malfunction of fan control relay
Malfunction of condenser fan relay
Malfunction of radiator fan motor
Malfunction of condenser fan motor
Malfunction of relay box
Malfunction of ETACS-ECU
Damaged wiring harness or connector

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III other system diagnosis codes

Confirm whether the diagnosis codes are output from ETACS-ECU.

Q. Is the diagnosis code output?

	Perform the troubleshooting of ETACS-ECU (Refer to GROUP 54A - ETACS - Diagnosis Code Chart ).

	Go to Step 2.

STEP 2. Check the cooling fan relay.

Refer to

Q. Is the check result normal?

	Go to Step 3.

	Replace the relay.

STEP 3. Connectors check: A-35X condenser fan relay connector, A-34X radiator fan relay connector and A-36X fan control relay connector.

Check for the contact with terminals.

Q. Is the check result normal?

	Go to Step 4.

	Repair the defective connector.

STEP 4. Check the cooling fan motor.

Refer to

Q. Is the check result normal?

	Go to Step 5.

	Replace the fan motor.

STEP 5. Connectors check: A-43 condenser fan motor connector and A-47 radiator fan motor connector.

Check for the contact with terminals.

Q. Is the check result normal?

	Go to Step 6.

	Repair the defective connector.

STEP 6. Measure the voltage at radiator fan relay connector A-34X.

(1)Remove the radiator fan relay, and measure at relay box side.

(2)Measure the voltage between terminal No.3 and earth. Measure the voltage between terminal No.4 and earth.
OK: System voltage

Q. Is the check result normal?

	Go to Step 8.

	Go to Step 7.

STEP 7. Check the harness between radiator fan relay connector A-34X terminal Nos.3, 4 and fusible link No.29.

Check the power supply line for short or open circuit.

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Repair the wiring harness.

STEP 8. Measure the voltage at fan control relay connector A-36X.

(1)Remove the fan control relay, and measure at relay box side.

(2)Measure the voltage between terminal No.1 and earth.
OK: System voltage

Q. Is the check result normal?

	Go to Step 10.

	Go to Step 9.

STEP 9. Check the harness between fan control relay connector A-36X terminal No.1 and fusible link No.28.

Check the power supply line for short or open circuit.

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Repair the relay box.

STEP 10. Measure the voltage at condenser fan relay connector A-35X.

(1)Remove the condenser fan relay, and measure at relay box side.

(2)Measure the voltage between terminal No.3 and earth. Measure the voltage between terminal No.4 and earth.
OK: System voltage

Q. Is the check result normal?

	Go to Step 12.

	Go to Step 11.

STEP 11. Check the harness between condenser fan relay connector A-35X terminal Nos.3, 4 and fusible link No.28.

Check the power supply line for short or open circuit.

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Repair the relay box.

STEP 12. Check the harness between radiator fan relay connector A-34X terminal No.2 and radiator fan motor connector A-47 terminal No.1.

Check the output line for short or open circuit.

Q. Is the check result normal?

	Go to Step 13.

	Repair the wiring harness.

STEP 13. Check the harness between fan control relay connector A-36X terminal No.2 and radiator fan motor connector A-47 terminal No.2.

Check the output line for short or open circuit.

Q. Is the check result normal?

	Go to Step 14.

	Repair the wiring harness.

STEP 14. Measure the resistance at fan control relay connector A-36X.

(1)Remove the fan control relay, and measure at relay box side.

(2)Measure the resistance between terminal No.5 and body earth.
OK: Continuity (Less than 2 Ω)

Q. Is the check result normal?

	Go to Step 16.

	Go to Step 15.

STEP 15. Check the harness between fan control relay connector A-36X terminal No.5 and earth.

Check the earth line for open circuit.

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Repair the wiring harness.

STEP 16. Check the harness between fan control relay connector A-36X terminal No.4 and condenser fan relay connector A-35X terminal No.2.

Check the output line for short or open circuit.

Q. Is the check result normal?

	Go to Step 17.

	Repair the wiring harness.

STEP 17. Check the harness between condenser fan relay connector A-35X terminal No.2 and condenser fan motor connector A-43 terminal No.1.

Check the output line for short or open circuit.

Q. Is the check result normal?

	Go to Step 18.

	Repair the wiring harness.

STEP 18. Measure the resistance at condenser fan motor connector A-43.

(1)Remove the condenser fan motor connector, and measure at harness side.

(2)Measure the resistance between terminal No.2 and body earth.
OK: Continuity (Less than 2 Ω)

Q. Is the check result normal?

	Go to Step 20.

	Go to Step 19.

STEP 19. Check the harness between condenser fan motor connector A-43 terminal No.2 and earth.

Check the earth line for open circuit.

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Repair the wiring harness.

STEP 20. Check the harness between ETACS-ECU connector C-312 terminal No.2 and radiator fan relay connector A-34X terminal No.1.

Check the ETACS-ECU input line for open circuit.

Q. Is the check result normal?

	Go to Step 21.

	Repair the wiring harness.

STEP 21. Check the harness between ETACS-ECU connector C-312 terminal No.9 and fan control relay connector A-36X terminal No.3.

Check the ETACS-ECU input line for open circuit.

Q. Is the check result normal?

	Go to Step 22.

	Repair the wiring harness.

STEP 22. Check the harness between ETACS-ECU connector C-312 terminal No.8 and condenser fan relay connector A-35X terminal No.1.

Check the ETACS-ECU input line for open circuit.

Q. Is the check result normal?

	Replace the ETACS-ECU (Refer to GROUP54A - ETACS-ECU ). Then go to Step 23 .

	Repair the wiring harness.

STEP 23. Retest the system.

Check that the radiator fan and the condenser fan work.

Q. Is the check result normal?

	The procedure is complete.

	Return to Step 1.