DTC P0481: Fan 2 Control Circuit
P0481 - FAN 2 CONTROL CIRCUIT
| Description: This DTC sets when the HFC output is commanded on (grounded) and excessive current draw is detected on the HFC circuit; or when the HFC circuit is commanded off and voltage is not detected on the HFC circuit (the PCM expects to detect VPWR voltage through the high speed FC relay coil to the HFC circuit). | |||
Possible Causes:
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| Diagnostic Aids: When the high fan control fault (HFCF) PID reads YES, a concern is present. An open circuit or short to ground can only be detected when the PCM is not grounding the HFC circuit. A short to voltage can only be detected when the PCM is grounding the HFC circuit. During the key ON engine OFF (KOEO) and key ON engine running (KOER) self-test, the HFC circuit is cycled ON and OFF. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST KF . | ||