DTC P1479: High Fan Control (HFC)/Fan Control 3 (FC3) Primary Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P1479 - HIGH FAN CONTROL (HFC)/FAN CONTROL 3 (FC3) PRIMARY CIRCUIT MALFUNCTION
| Description: | Monitors the HFC primary circuit output from the powertrain control module (PCM). The test fails if the HFC output commanded on (grounded), excessive current draw is detected on the HFC circuit or, with the HFC circuit commanded off, 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 HFCF PID reads YES, a fault 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. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Taurus, Sable, Escape 3.0L, Mariner 3.0L, Ford GT | GO to KF: Fan Control (FC) Relays STEP KF34. | GO to KF: Fan Control (FC) Relays STEP KF34. | GO to KF: Fan Control (FC) Relays STEP KF53. |
| All others | GO to KF: Fan Control (FC) Relays STEP KF11. | GO to KF: Fan Control (FC) Relays STEP KF11. | GO to KF: Fan Control (FC) Relays STEP KF45. |