P0480

P0480-COOLING FAN 1 CONTROL CIRCUIT





For complete wiring diagrams refer to Diagrams/Electrical.


- When Monitored:

With the ignition on. Battery voltage greater than 10 volts.

- Set Condition:

The PCM receives a CAN Bus message from the FCM indicating an open or shorted circuit on the Radiator Fan Relay Control circuit.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Diagnostic Test

1. RADIATOR FAN CONTROL RELAY OPERATION

NOTE: When actuating the radiator fan relays, the Radiator Fan(s) may have a delay in operation and ramp up slowly.

Turn the ignition on.
With a scan tool, select Radiator Cooling Fan Relay #1 Control State to actuate the Radiator Fan Control Relay.

Is the Cooling Fan Relay operating?

Yes

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC
- Perform the PCM Verification Test Ver. 1. PCM Verification Test

No

- Go to 2


2. FUSED B+ CIRCUITS





Turn the ignition off.
Remove the Radiator Fan Control Relay.
Using a 12 volt test light connected to ground, check the Fused B+ circuits.

Is the test light illuminated and bright?

Yes

- Go to 3

No

- Repair the open or short to ground in the Fused B+ circuits. Inspect the related fuse and repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT





Turn the ignition on, engine not running.
With a scan tool, actuate the Radiator Cooling Fan Relay #1 Control State.
Using a 12-volt test light connected to battery voltage, check the Radiator Control Relay Control circuit.

Does the test light illuminate with the actuation?

Yes

- Replace the Radiator Fan Control Relay.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go to 4

4. (N201) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT OPEN





Turn the ignition off.
Remove the FCM from the PDM.
Measure the resistance of the (N201) Radiator Fan Control Relay Control circuit from the Relay to the FCM PDM - 49 way connector.

Is the resistance below 5.0 ohms?

Yes

- Go to 5

No

- Replace the PDM.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

5. (N201) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT SHORTED TO GROUND





Measure the resistance between ground and the (N201) Radiator Fan Control Relay Control circuit at the Relay connection.

Is the resistance below 100 ohms?

Yes

- Replace the PDM.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace Front Control Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test