P0481-COOLING FAN 2 CONTROL CIRCUIT

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the ignition on.
Set Condition:
The Powertrain Control Module (PCM) is requesting the Totally Integrated Power Module (TIPM) to turn on the High Speed Cooling Fan Relay and it is not operating. The High Speed Cooling Fan Relay is mounted to the front core support near the left headlamp.

Possible Causes
CAN C BUS FAILURE
ENGINE COOLANT TEMPERATURE (ECT) SENSOR DTCS SET
COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM
POWERTRAIN CONTROL MODULE (PCM)

1. COOLING FAN RELAY OPERATION

1.	Ignition on, engine not running.

2.	With a scan tool, actuate the Cooling Fan High Speed Relay.

Is the Cooling Fan operating?

Yes

2. CAN C or ENGINE COOLANT TEMPERATURE (ECT) SENSOR DTCs CURRENTLY ACTIVE

Are any CAN C or Engine Coolant Temperature (ECT) Sensor DTCs Active at this time?

Yes

3. COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM

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

Yes

4. POWERTRAIN CONTROL MODULE

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

1.	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

Replace and program the Powertrain Control Module in accordance with the service information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).