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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 1.6L Engine - DTCS P127D To P2135 >> Diagnosis And Testing >> P127E-Fuel Pump Control Circuit 2 Open (TIPM) >> Diagnostic Test

Diagnostic Test

  1. 1)  FUEL PUMP OPERATION 

    Ignition on, engine not running.

    With a scan tool under the PCM Actuators, actuate the Fuel Pump.

    Is the Fuel Pump operating? 

    Yes 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  2).
  2. 2)  FUEL PUMP CONTROL OPERATION FROM THE PCM 

    Turn the ignition off.

    Disconnect the C2 TIPM harness connector.

    Ignition on, engine not running.

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

    With a 12-volt test light connected to ground, probe the (K31) Fuel Pump Control circuit in the TIPM C2 harness connector.

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

    Yes 

    1. Go To  3).

    No 

    1. Perform the Diagnostic Procedures for P0628 & P0629 - FUEL PUMP CONTROL CIRCUIT LOW/HIGH. (Refer to ENGINE - DIAGNOSIS AND TESTING - DIAGNOSTIC CODE INDEX) .
  3. 3)  (N1) FUEL PUMP CONTROL OUTPUT CIRCUIT OPEN 
    Fig 1: MEASURING RESISTANCE OF THE FUEL PUMP CONTROL OUTPUT CIRCUIT
    GC0041773Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off

    Disconnect the TIPM C7 harness connector.

    Disconnect the Fuel Pump Module harness connector.

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  4).

    No 

    1. Repair the short to ground in the (N1) Fuel Pump Control Output circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  4. 4)  FUEL PUMP MODULE 
    Fig 2: Checking Fuel Pump Control Output Circuit
    GC0041770Courtesy of DAIMLERCHRYSLER CORP.

    Connect the C2 and C7 TIPM harness connectors.

    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.

    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 the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  5).
  5. 5)  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 the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace the Totally Integrated Power Module in accordance with the Service Information.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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