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P1285 Fuel Injection Pump Controller Always On

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Mopar1973Man

By Mopar1973Man

DTC P1285: FUEL INJECTION PUMP CONTROLLER ALWAYS ON

Monitor & Set Conditions

Fuel Pump Control Module (FPCM) is monitored with ignition off and less than 600 RPM. DTC may set when more than 4 CAN BUS messages are received from FPCM while key is off and RPM is less than 600.

Possible Causes

  • Fuel Injection Pump Relay Stuck On

Testing

Turn ignition off. Remove fuel pump relay from Power Distribution Center (PDC). PDC is located at driver's side front corner of engine compartment. Fuel injection pump relay may also be referred to as fuel relay. Note which terminals on fuel pump relay correspond with cavities in PDC. Using DVOM, measure resistance between terminals on fuel pump relay that correspond with cavities No. 30 and 87 in PDC. If resistance is 5 ohms or greater, test is complete. If resistance is less than 5 ohms, replace fuel pump relay.

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