INSPECTION PROCEDURE 2: Radiator Fan and Condenser Fan do not Change Speed or Stop

Radiator Fan and Condenser Fan Drive Circuit

Refer to

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
Malfunction of fan controller
Malfunction of engine-ECU <M/T> or engine-A/T-ECU <A/T>
Damaged wiring harness or connector

DIAGNOSIS

STEP 1. Check the fan control relay.

Refer to

Q. Is the fan control relay in good condition?

	Go to Step 2.

	Replace the fan control relay. Then go to Step 8.

STEP 2. Check the fan control relay connector A-13X.

Q. Is the connector in good condition?

Go to Step 3.

Repair the connector or replace the relay box. Then go to Step 8.

STEP 3. 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 4.

Repair the damaged harness wire. Then go to Step 8.

STEP 4. 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 5.

Repair or replace the connector. Then go to Step 8.

STEP 5. Check the harness wire between fan controller connector A-26 terminal 2 and engine-ECU connector or engine-A/T-ECU connector C-110 terminal 17.

Q. Are these harness wires in good condition?

Go to Step 6.

Repair the damaged harness wire. Then go to Step 8.

STEP 6. 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 7.

Replace the fan motor and fan controller (Refer to

). Then go to Step 8.

STEP 7. 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 8 .

STEP 8. Check the symptoms.

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

	This symptoms is complete.

	Return to Step 1.