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Home >> Chrysler >> 2007 >> PT Cruiser Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P050D To P0688 >> P0594-Speed Control Servo Power Circuit >> Diagnostic Test

Diagnostic Test

  1. 1) SPEED CONTROL VACUUM CONTROL 

    Ignition on, engine not running.

    With the scan tool read DTCs and record the related Freeze Frame data.

    With the scan tool actuate the Speed Control Vacuum Solenoid and note operation.

    Does the Speed Control Vacuum Solenoid actuate properly? 

    Yes 

    1. Perform INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  2).
  2. 2) (V397) S/C BRAKE SWITCH OUTPUT CIRCUIT 

    Turn the ignition off.

    Disconnect the S/C Servo harness connector.

    Turn the ignition on.

    Using the scan tool actuate the S/C Vacuum Solenoid.

    Using a test light connected to ground, probe the (V397) S/C Brake Switch Output circuit in the S/C Servo harness connector.

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

    Yes 

    1. Go to  6).

    No 

    1. Go to  3).
  3. 3) (V32) S/C SUPPLY CIRCUIT 

    Turn the ignition off.

    Disconnect the Stop Lamp Switch harness connector.

    Turn the ignition on.

    Using the scan tool actuate the S/C Vacuum Solenoid.

    Using a test light connected to ground, probe the (V32) S/C Supply circuit in the Brake Switch harness connector.

    Does the test light illuminate brightly? 

    Yes 

    1. Go to  4).

    No 

    1. Go to  7).
  4. 4) (V397) S/C BRAKE SWITCH OUTPUT CIRCUIT OPEN 
    Fig 1: Measuring Resistance Of S/C Brake Switch Output Circuit
    GC0041726Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance of the (V397) S/C Brake Switch Output circuit from the Speed Control Servo harness connector to the Stop Lamp Switch connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the open in the (V397) S/C Brake Switch Output circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5) (V397) S/C BRAKE SWITCH OUTPUT CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground & S/C Brake Switch Output Circuit
    GC0041727Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (V397) S/C Brake Switch Output circuit at the Speed Control Servo harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (V397) S/C Brake Switch Output circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace the Stop Lamp Switch.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6) (Z902) S/C GROUND CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of S/C Ground Circuit
    GC0041730Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance of the (Z902) S/C Ground circuit at the S/C Servo harness connector to ground.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the Speed Control Servo.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Repair the open in the (Z902) S/C Ground circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  7. 7) (V32) S/C SUPPLY OPEN 
    Fig 4: Measuring Resistance Of S/C Supply Circuit
    GC0041724Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the PCM harness connector.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (V32) S/C Supply circuit from the Brake Lamp Switch harness connector to the appropriate terminal of special tool # 8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  8).

    No 

    1. Repair the open/high resistance in the (V32) S/C Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  8. 8) (V32) S/C SUPPLY CIRCUIT SHORT TO GROUND 
    Fig 5: Measuring Resistance Between Ground & S/C Supply Circuit
    GC0041725Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (V32) S/C Supply circuit at the Speed Control Servo harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (V32) S/C Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  9).
  9. 9) PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    If the there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
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