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  • P0480 Fan Clutch

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    Mopar1973Man

    P0480 FAN CLUTCH

    When Monitored and Set Condition:

    When Monitored: When the ignition is on.
    Set Condition: The PWM signal to the fan clutch does not match the PWM signal from the fan clutch.

    POSSIBLE CAUSES

    • FAN CLUTCH
    • WIRE HARNESS DAMAGED
    • OPEN FAN CLUTCH (Y1) DRIVER CIRCUIT
    • (Y1) DRIVER CIRCUIT SHORTED TO (K4) RETURN CIRCUIT
    • (Y1) DRIVER CIRCUIT SHORTED TO BATTERY NEGATIVE
    • INTERMITTENT CONDITION
    • ECM

    DIAGNOSTIC PROCEDURE

    1. Disconnect the fan clutch harness connector. Check connectors - Clean/repair as necessary. Measure the resistance between the fan clutch (Y1) driver circuit and the fan speed (K4) sensor return circuit on the fan clutch assembly. Is the resistance less than 10 Ohms?
      Yes --> Replace the fan clutch. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Go To 2
    2. Disconnect the Fan Clutch harness connectors. Check connectors - Clean/repair as necessary. Measure the resistance between the fan clutch (Y1) driver circuit and the fan clutch battery supply circuit on the fan clutch assembly. Is the resistance less than 6 Ohms or greater than 10 Ohms?
      Yes --> Replace the fan clutch. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Go To 3
    3. Disconnect the ECM harness connectors. Check connectors - Clean/repair as necessary. Measure the resistance of the fan clutch (Y1) driver circuit between the ECM harness connector and the fan clutch harness connector. Is the resistance less than 10 Ohms?
      Yes --> Go To 4
      No --> Repair the open fan clutch (Y1) river circuit. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    4. Measure the resistance between the fan clutch (Y1) driver circuit and the fan speed sensor (K4) return circuit at the sensor harness connector. Is the resistance greater than 100K Ohms?
      Yes --> Go To 5
      No --> Repair the (Y1) Driver circuit shorted to (K4) Return circuit. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    5. Measure the resistance between the fan clutch (Y1) driver circuit and the battery negative. Is the resistance greater than 100k Ohms?
      Yes --> Go To 6
      No --> Repair the (Y1) Driver circuit shorted to battery negative. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    6. Reconnect the ECM harness connectors. Measure the resistance of the fan clutch (Y1) driver circuit between the fan clutch connector and battery negative. Is the resistance greater than 100k Ohms?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

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