P0481-COOLING FAN 2 CONTROL CIRCUIT

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
Set Condition:
The ECM is requesting the TIPM to turn on the Cooling Fan On and it is not operating.

Possible Causes

CAN C BUS FAILURE

ENGINE COOLANT TEMP SENSOR DTCS SET

COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM

ECM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Diagnostic Test

1. COOLING FAN RELAY OPERATION

Ignition on, engine not running.
With a scan tool, actuate the Cooling Fan High Speed Relay.

Is the Cooling Fan operating?

Yes

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

Go To 2

2. CAN C or ECT DTCS CURRENTLY ACTIVE

Are any CAN C or ECT DTCs Active at this time?

Yes

Refer to the appropriate diagnostics for the ECT Sensor or CAN C Bus DTC.

No

Go To 3

3. COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM

Are any Cooling Fan Control Circuit DTCs set in the TIPM?

Yes

Diagnose the appropriate Cooling Fan Control Circuit DTC in the TIPM

No

Go To 4

4. ECM

NOTE: Before continuing, check the ECM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

Repair as necessary.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)