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Home >> Jeep >> 2007 >> Compass Limited, AWD, Automatic CVT >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P127A To P2015 >> P127C-Fuel Pump Control Circuit 2 Low (TIPM) >> Diagnostic Test
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Diagnostic Test

  1. 1) DTC IS ACTIVE 
    NOTE: If P0627, P0628 or P0629 has set along with this DTC, diagnose those DTC(s) first before continuing.

    Ignition on, engine not running.

    With the scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the *CHECKING FOR AN INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) FUEL PUMP MODULE 
    Fig 1: Probing (N1) Fuel Pump Control Output Circuit In The Fuel Pump Harness Connector
    GC0053965Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Fuel Pump Module harness connector.

    Ignition on, engine not running.

    Using the scan tool under the TIPM Actuators, actuate the Fuel Pump.

    With a 12-volt test light connected to ground, probe the (N1) Fuel Pump Control Output circuit at the Fuel Pump Module harness connector.

    NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.

    Does the test light illuminate brightly and flash on and off? 

    Yes 

    1. Replace the Fuel Pump Module in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go To  3).
  3. 3) (N1) FUEL PUMP CONTROL OUTPUT CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground And (N1) Fuel Pump Control Output Circuit At The TIPM C7 Harness Connector
    GC0053966Courtesy of CHRYSLER LLC

    Turn the ignition off

    Disconnect the TIPM C7 harness connector.

    Measure the resistance between ground and the (N1) Fuel Pump Control Output circuit at the TIPM C7 harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (N1) Fuel Pump Control Output circuit.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go To  4).
  4. 4) TOTALLY INTEGRATED POWER MODULE 
    NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors.

    Pay particular attention to all Power and Ground circuits.

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Replace the Totally Integrated Power Module in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .
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