P0481 DODGE Cooling Fan 2 Control Circuit

P0481 DODGE Cooling Fan 2 Control Circuit - The Powertrain Control Module (PCM) controls the cooling fan 2 (high speed) relay by grounding the (N112) high rad fan relay control circuit when it is determined that high speed fan operation is required.

An open or shorted circuit is detected in the high speed rad fan control circuit. One trip fault. Three good trips to turn off the MIL.

Possible causes P0481 Cooling Fan 2 Control Circuit

• (N112) Rad fan relay control circuit open.
• (N112) Rad fan relay control circuit shorted to ground.
• High rad fan relay.
• Powertrain Control Module (PCM).

Diagnose P0481 Cooling Fan 2 Control Circuit

Step 1. Radiator cooling fan module operation

Ignition on, engine not running. With the scan tool, actuate both the radiator cooling fan relays no.1 and no.2

Are both cooling fan operating at medium speed?

YES, perform the ABS Intermittent condition.
NO, go to step 2.

Step 2. (N112) Rad fan relay control circuit open

Measure the resistance of the (N112) Rad fan relay control circuit from the high rad fan relay harness connector to the PCM C1 harness connector.

Is the resistance below 5.0 Ohms?

YES, go to step 3.
NO, repair the open in the rad fan relay control circuit.

Step 3. (N112) Rad fan relay control circuit shorted to ground

Measure the resistance between ground and the (N112) Rad fan relay control circuit in the PCM C1 harness connector.

Is the resistance below 100 Ohms?

YES, repair the short to ground in the (N112) rad fan relay control circuit.
NO, replace the Powertrain Control Module (PCM). Perform the Powertrain Verification Test.

Test complete for code P0481 DODGE Cooling Fan 2 Control Circuit.

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