P0482 - Fan 3 Control Circuit
P0482 - FAN 3 CONTROL CIRCUIT
| Description: | Monitors the MFC primary circuit output from the powertrain control module (PCM). The test fails, when the MFC output is commanded on (grounded) and excessive current draw is detected on the MFC circuit; or when the MFC circuit is commanded off and voltage is not detected on the MFC circuit (the PCM expects to detect IGN START/RUN voltage through the medium speed FC relay coil to the MFC circuit). | |||
| Possible Causes: |
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| Diagnostic Aids: | When the MFCF PID reads YES, a concern is currently present. An open circuit or short to ground can only be detected when the PCM is not grounding the MFC circuit. A short to voltage can only be detected when the PCM is grounding the MFC circuit. During the key on engine off (KOEO) and key on engine running (KOER) self-test, the MFC circuit is cycled on and off. Use output test mode to command the low speed/high speed fan on. The PCM also activates the medium speed fan output. | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory | |
| All | refer to PINPOINT TEST KF . | |||