INSPECTION PROCEDURE 1: Radiator Fan and Condenser Fan do not Operate

CIRCUIT OPERATION

The fan controller is powered from fusible link No.2.
The engine-ECU <M/T> or engine-A/T-ECU <A/T> uses input signals from the A/C switch, the water temperature sensor unit and the vehicle speed sensor <M/T> or the output shaft speed sensor <A/T> to control the speed of the radiator fan motor and the condenser fan motor.
The engine-ECU <M/T> or engine-A/T-ECU <A/T> controls the fan controller to activate the radiator fan motor and the condenser fan motor.

TECHNICAL DESCRIPTION

The cause could be a malfunction of the fan controller power supply or earth circuit.
If the communication line wiring harness between the fan controller and the engine-ECU <M/T> or engine-A/T-ECU <A/T> is short-circuited to earth, the radiator fan motor and the condenser fan motor will not rotate.
The cause could also be a malfunction of input signal from the A/C switch, the water temperature sensor unit and the vehicle speed sensor <M/T> or the output shaft speed sensor <A/T> to the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
The cause could also be a malfunction of the fan controller or the engine-ECU <M/T> or engine-A/T-ECU <A/T>.

TROUBLESHOOTING HINTS

Malfunction of fusible link No.2
Malfunction of fan control relay
Malfunction of cooling fan motor and fan controller
Malfunction of engine-ECU <M/T> or engine-A/T-ECU <A/T>
Damaged wiring harness or connector

DIAGNOSIS

STEP 1. Measure the power supply voltage at fan controller connector A-26.

(1)Disconnect fan controller connector A-26 and measure wiring harness side connector.
(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between fan controller connector A-26 terminal 3 and body earth.

The voltage should measure system voltage.

(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Connect fan controller connector A-26.

Q. Is the measured voltage system voltage?

Go to Step 17.

Go to Step 2.

STEP 2. Check the fan controller connector A-26.

Q. Is the connector in good condition?

Go to Step 3.

Repair or replace the connector. Then go to Step 24.

STEP 3. Check the fusible link No.2.

Q. Is the fusible link No.2 in good condition?

Go to Step 4.

Replace the fusible link No.2. Then go to Step 24.

STEP 4. Measure the power supply voltage at fan control relay connector A-13X.

(1)Disconnect fan control relay connector A-13X (remove the fan control relay) and measure relay box side connector.
(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between fan control relay connector A-13X terminal 4 and body earth.

The voltage should measure system voltage.

(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Connect fan control relay connector A-13X (install the fan control relay).

Q. Is the measured voltage system voltage?

Go to Step 7.

Go to Step 5.

STEP 5. Check the fan control relay connector A-13X.

Q. Is the connector in good condition?

Go to Step 6.

Repair the connector or replace the relay box. Then go to Step 24.

STEP 6. Check the harness wire between fusible link No.2 and fan control relay connector A-13X terminal 4.

Q. Is the harness wire in good condition?

An intermittent malfunction is suspected (Refer to GROUP 00 - How to use troubleshooting

Repair the damaged harness wire. Then go to Step 24.

STEP 7. Check the fan control relay.

Refer to

Q. Is the fan control relay in good condition?

	Go to Step 8.

	Replace the fan control relay. Then go to Step 24.

STEP 8. Check the fan control relay connector A-13X.

Q. Is the connector in good condition?

Go to Step 9.

Repair the connector or replace the relay box. Then go to Step 24.

STEP 9. Check the harness wire between fan control relay connector A-13X terminal 2 and fan controller connector A-26 terminal 3.

Q. Is the harness wire in good condition?

Go to Step 10.

Repair the damaged harness wire. Then go to Step 24.

STEP 10. Measure the terminal voltage at fan control relay connector A-13X.

(1)Disconnect fan control relay connector A-13X (remove the fan control relay) and measure relay box side connector.
(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between fan control relay connector A-13X terminal 3 and body earth.

The voltage should measure system voltage.

(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Connect fan control relay connector A-13X (install the fan control relay).

Q. Is the measured voltage system voltage?

Go to Step 13.

Go to Step 11.

STEP 11. Check the J/C No.4 C-116, intermediate connector A-16 and fan control relay connector A-13X.

Q. Are there connectors in good condition?

Go to Step 12.

Repair or replace the connector. Then go to Step 24.

STEP 12. Check the harness wire between J/C No.4 C-116 terminal 8 and fan control relay connector A-13X terminal 3.

Q. Are these harness wires in good condition?

An intermittent malfunction is suspected (Refer to GROUP 00 - How to use troubleshooting

Repair the damaged harness wire. Then go to Step 24.

STEP 13. Check the continuity between fan control relay connector A-13X and body earth.

(1)Disconnect fan control relay connector A-13X (remove the fan control relay) and measure relay box side connector.

(2)Check that there is continuity between fan control relay connector A-13X terminal 1 and body earth.

Continuity (less than 2 Ω ).

(3)Connect fan control relay connector A-13X (install the fan control relay).

Q. Does the continuity exists?

An intermittent malfunction is suspected (Refer to GROUP 00 - How to use troubleshooting

Go to Step 14.

STEP 14. Check the fan control relay connector A-13X.

Q. Is the connector in good condition?

Go to Step 15.

Repair the connector or replace the relay box. Then go to Step 24.

STEP 15. Check the earth connector A-25.

Q. Is the connector in good condition?

Go to Step 16.

Repair or replace the connector. Then go to Step 24.

STEP 16. Check the harness wire between fan control relay connector A-13X terminal 1 and body earth connector A-25 terminal 5.

Q. Is the harness wire in good condition?

An intermittent malfunction is suspected (Refer to GROUP 00 - How to use troubleshooting

Repair the damaged harness wire. Then go to Step 24.

STEP 17. Check the continuity between fan controller connector A-26 and body earth.

(1)Disconnect fan controller connector A-26 and measure wiring harness side connector.

(2)Check that there is continuity between fan controller connector A-26 terminal 1 and body earth.

Continuity (less than 2 Ω ).

(3)Connect fan controller connector A-26.

Q. Dose the continuity exists?

Go to Step 20.

Go to Step 18.

STEP 18. Check the fan controller connector A-26.

Q. Is the connector in good condition?

Go to Step 19.

Repair or replace the connector. Then go to Step 24.

STEP 19. Check the harness wire between fan controller connector A-26 terminal 1 and body earth.

Q. Is the harness wire in good condition?

An intermittent malfunction is suspected (Refer to GROUP 00 - How to use troubleshooting

Repair the damaged harness wire. Then go to Step 24.

STEP 20. Check the fan controller connector A-26, intermediate connector A-16 and engine-ECU connector or engine-A/T-ECU connector C-110.

Q. Are these connectors in good condition?

Go to Step 21.

Repair or replace the connector. Then go to Step 24.

STEP 21. Check the harness wire between fan controller connector A-26 terminal 2 and engine-ECU or engine-A/T-ECU connector C-110 terminal 17.

Q. Are these harness wires in good condition?

Go to Step 22.

Repair the damaged harness wire. Then go to Step 24.

STEP 22. Check the fan controller.

(1)Disconnect engine-ECU connector or engine-A/T-ECU connector C-110.

(2)Pull out connector terminal pin 17 to disconnect connector.
(3)Reconnect the connector with connector terminal pin still removed.
(4)Turn the ignition switch to the "ON" position.
(5)Check for the cooling fan operation.

The cooling fan rotates. (with connector terminal pin 17 disconnected)
The cooling fan stops. (When connector terminal pin 17 is connected to the body earth.)

(6)Turn the ignition switch to the "OFF" position.
(7)Disconnect engine-ECU connector or engine-A/T-ECU connector C-110, and push in connector terminal pin 17 to disconnect connector.
(8)Reconnect the connector with connector terminal pin still installed.

Q. Does the cooling fan rotate? And when the connector terminal pin is connected to the body earth, does the cooling fan stop?

Go to Step 23.

Replace the fan motor and fan controller (Refer to

). Then go to Step 24.

STEP 23. M.U.T.-III self-diag code

Check if an MPI system self-diag code is set. (Refer to GROUP 13A - Trouble shooting

)<Vehicles except for Hong Kong and Singapore>, (Refer to GROUP 13B - Trouble shooting

)<Vehicles for Hong Kong and Singapore>.

Q. Diagnosis code set?

	Inspection chart for diagnosis code (Refer to GROUP 13A - Trouble shooting )<Vehicles except for Hong Kong and Singapore>, (Refer to GROUP 13B - Trouble shooting )<Vehicles for Hong Kong and Singapore>.

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T> (Refer to GROUP 13A, Engine-ECU and Engine-A/T-ECU<Vehicles except for Hong Kong and Singapore> ), (Refer to GROUP 13B, Engine-A/T-ECU <Vehicles for Hong Kong and Singapore> ). Then go to Step 24 .

STEP 24. Check the symptoms.

Q. Does the radiator fan motor and the condenser fan motor operate correctly?

	This symptoms is complete.

	Return to Step 1.