Radiator Cooling Fan: Testing and Inspection

Cooling Fan 1, 2 Control Circuit Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Test lamp

• Wiring diagram.

• Cooling Fan Module 1 is identified as J293 and Cooling Fan Module 2 is identified as J671.

Test requirements

• The Cooling Fan Module fuse S1 for J293 or S2 for J671 and S10 (for both modules) are OK.

• Battery voltage at least 12.5 V.

• All electrical consumers switched off.

• A/C switched off.

• The ignition switched OFF.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Start diagnosis

- Disconnect the Cooling Fan Control Module (J293 or J671) electrical harness connector.

Checking voltage supply

Switch the ignition ON.

- Using a multimeter, check the Cooling Fan Control Module (J293 or J671) harness connector terminal 1 to ground for voltage.

- Using a multimeter, check the Cooling Fan Control Module (J293 or J671) harness connector terminal 2 to ground for voltage.

Specified value for both terminals: Battery voltage.

Switch the ignition OFF.

If the specified value was Not obtained at Terminal 1 of the Cooling Fan Control Module:

- Check the wiring from the Cooling Fan Control Module (J293 or J671) harness connector terminal 1 to fuse S1 (for J293) or S2 (for J671) for high resistance, open or short to ground. Refer to the Wiring Diagram.

- Check the harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection and replace any blown fuse.

If the specified value was Not obtained at Terminal 2 of the Cooling Fan Control Module:

- Check the wiring from the Cooling Fan Control Module (J293 or J671) harness connector terminal 2 to fuse S10 for high resistance, open or short to ground. Refer to the Wiring Diagram.

- Check the harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the wiring connection and replace any blown fuse.

If the specified value was obtained:

- Connect a test lamp to Battery positive. Connect the other end to terminal 4 of the Cooling Fan Control Module (J293 or J671) harness connector.

Switch the ignition ON.

Specified value: Test lamp is ON.

Switch the ignition OFF.

If the specified value was Not obtained:

- Check the ground circuit for an open or high resistance.

- Check the harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Switch the ignition ON.

- Using a multimeter, check the Cooling Fan Control Module (J293 or J671) harness connector terminal 3 to ground for voltage.

Specified value: 0.330 to 0.360 V.

Switch the ignition OFF.

If the specified value was obtained:

- Replace the Cooling Fan Control Module (J293 or J671). Refer to the Repair Manual.

If the specified value was Not obtained:

Checking wiring

If the manufacturers test box is being used, perform the following step.

- Install the test box.

If the manufacturers test box is not being used, perform the following step.

- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Manual.

- Using a multimeter, check the Cooling Fan Control Module (-N112-) harness connector terminal 3 to the Engine Control Module (ECM) (J623) electrical harness connector T121 for high resistance, short to ground or voltage, or an open circuit.





OR





Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

- Check the wiring for an open, high resistance or short to ground or voltage.

- Check the harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring:

- Replace the Engine Control Module (ECM) (J623). Refer to the Repair Manual.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Scan Tool Testing and Procedures.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Scan Tool Testing and Procedures.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.