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Home >> Jeep >> 2018 >> Grand Cherokee Trackhawk >> Repair and Diagnosis >> Engine Performance >> System >> 6.2L - DTCS P0141 To P0441 >> DTC Troubleshooting >> P025C-Fuel Pump Module Control Circuit Low >> Diagnostic Test
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Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    NOTE:

    If DTC P0627 is present, repair that DTC before proceeding with this test.

    1. Turn the ignition on.
    2. With the scan tool, read DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (N15) FUEL PUMP CONTROL OUTPUT CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the FPCM harness connector.
    3. Remove the Fuel Pump Relay.
    4. Check for continuity between ground and the (N15) Fuel Pump Control Output circuit at the FPCM harness connector.

      Is there continuity between ground and the (N15) Fuel Pump Control circuit?

      Yes 

      • Repair the (N15) Fuel Pump Control Output circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (N15) FUEL PUMP CONTROL OUTPUT CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Check for continuity of the (N15) Fuel Pump Control Output circuit between the FPCM harness connector and the terminal 87 of the Fuel Pump Relay connector in the PDC.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (N15) Fuel Pump Control Output circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. FUEL PUMP CONTROL MODULE 
    1. Reconnect the Fuel Pump relay.
    2. Turn the ignition on, engine not running.
    3. With the scan tool, begin the Variable Speed Fuel Pump Relay Actuation Test.
    4. Measure the voltage between ground and the (N15) Fuel Pump Control Output circuit at the FPCM harness connector.

      Is the voltage equal to battery voltage?

      Yes 

      • Replace the Fuel Pump Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replace the Fuel Pump Relay in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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