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Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  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 (N1) 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. Measure the resistance between ground and the (N1) Fuel Pump Control Output circuit at the FPCM harness connector.

      Is the resistance above 10k Ohms?

      Yes 

      • Go To  3

      No 

      • Repair the (N1) Fuel Pump Control Output circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. CHECK THE (N1) FUEL PUMP CONTROL OUTPUT CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (N1) 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 (N1) 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 (N1) 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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