P1474 - Fan Control Primary Circuit
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P1474 - FAN CONTROL PRIMARY CIRCUIT
| Description: The PCM monitors the low fan control (LFC) primary circuit output. This DTC sets if the PCM grounds the LFC circuit, excessive current draw is detected on the LFC circuit, or with the LFC circuit not grounded by the PCM, voltage is not detected on the LFC circuit (the PCM expects to detect VPWR voltage coming through the low speed fan control (FC) relay coil to the LFC circuit). | |||
Possible Causes:
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| Diagnostic Aids:
When the LFCF 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 LFC circuit. A short to voltage can only be detected when the PCM is grounding the LFC circuit. During the key ON engine OFF (KOEO) and key ON engine running (KOER) self-test, the LFC circuit is cycled ON and OFF. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST KF: FAN CONTROL RELAYS . | ||