High Fan Control Primary Circuit
Table of contents
P1479 MERCURY Possible Causes
- Faulty Cooling Fan
- Cooling Fan harness is open or shorted
- Cooling Fan circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How do I fix code P1479 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1479 MERCURY code
The cost of diagnosing the P1479 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
The Powertrain Control Module (PCM) enables high cooling fan and detects an open or shorted circuit
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1479 MERCURY Description
Monitors the High Fan Control (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).