Engine-Codes
 
OBDII Code List
 
P1477 MERCURY

P1477 MERCURY - Medium Cooling Fan Control Primary Circuit Failure

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

P1477 MERCURY Possible Causes

  • Faulty Cooling Fan Relay
  • Cooling Fan Relay harness is open or shorted
  • Cooling Fan Relay circuit poor electrical connection
  • Faulty Powertrain Control Module (PCM)

First diagnose P1477 MERCURY code

    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 terminals.

Cost of diagnosing the P1477 MERCURY code

    Labor: 1.0

    The cost of diagnosing the P1477 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

P1477 MERCURY Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1477 MERCURY Meaning

Monitors the medium fan control (MFC) primary circuit output from the Powertrain Control Module (PCM). The test fails if: With the MFC output commanded on (grounded), excessive current draw is detected on the MFC circuit; or with the MFC circuit commanded off, voltage is not detected on the MFC circuit (the PCM expects to detect IGN START/RUN voltage coming through the medium speed FC relay coil to the MFC circuit).
OBDII Code P1477 MERCURY - Medium Cooling Fan Control Primary Circuit Failure - Engine-Codes.com

P1477 MERCURY More Information

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