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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 1.6L Engine - DTCS P0303 To P0629 >> Diagnosis And Testing >> P0629-Fuel Pump Relay Control Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1)  FUEL PUMP OPERATION 

    Ignition on, engine not running.

    With a scan tool in the Powertrain 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 TIPM 
    Fig 1: CHECKING FUEL PUMP CONTROL
    GC0041940Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the TIPM C2 harness connector.

    Turn the ignition on.

    Using the scan tool in the Powertrain Actuators, actuate the Fuel Pump.

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

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

    Yes 

      NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
    1. If OK, replace the TIPM in accordance with the Service Information.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  (K31) FUEL PUMP CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 2: MEASURING VOLTAGE AT THE FUEL PUMP CONTROL CIRCUIT
    GC0041734Courtesy of DAIMLERCHRYSLER CORP.

    Stop the Fuel Pump actuation.

    Measure the voltage of the (K31) Fuel Pump Control circuit at the TIPM C2 harness connector.

    Does the voltmeter indicate voltage present? 

    Yes 

    1. Repair the short to voltage in the (K31) Fuel Pump Relay Control circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)  (K31) FUEL PUMP CONTROL CIRCUIT OPEN 
    Fig 3: MEASURING RESISTANCE OF THE FUEL PUMP CONTROL CIRCUIT
    GC0041942Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connector.

    Measure the resistance of the (K31) Fuel Pump Control circuit from the TIPM C2 harness connector to the PCM harness connector

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open in the (K31) Fuel Pump Control circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  PCM 
    NOTE: Before continuing, check the PCM 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 there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information. (Refer to STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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