P0481

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DTC P0481 Cooling Fan 2 Control Circuit Malfunction




Circuit Description
The Powertrain Control Module (PCM) controls the engagement of the cooling fan Low speed through the use of a relay and a control circuit. If the PCM commands the fan to Low speed and then senses that the fan did not turn ON, or if the PCM commands the fan OFF from Low speed and then senses that the fan did not turn OFF, the PCM will set a DTC P0481. DTC P0481 is a type D code.

Conditions for Setting the DTC
- Ignition voltage is greater than 10 volts.
- Engine run time is greater than 32 seconds.

The above conditions are met and one of the following conditions are met for 25 seconds within a 50 second test sample:
- PCM sensed voltage is High with the High Speed Fan OFF.

OR

- PCM sensed voltage is High with the High Speed Fan ON.

Action Taken When the DTC Sets
- The PCM will not turn on the Malfunction Indicator Lamp.
- The PCM will store the conditions that were present when the DTC was set as Freeze Frame and in Failure Records.

Conditions for Clearing the DTC
- A history DTC will clear after 40 consecutive trips without a reported failure.
- The DTC can be cleared using the Scan Tool's "Clear Info" function.

Diagnostic Aids
Poor connections or a damaged harness - Inspect the harness connectors for: backed out terminals, improper mating or damaged terminals. Also check for open circuits, shorts to ground, and shorts to voltage.