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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.4L Engine - DTCS PO509 To P0850 >> Diagnosis And Testing >> P0581-Speed Control Switch #1 High >> Diagnostic Test

Diagnostic Test

  1. 1)  SPEED CONTROL SWITCH VOLTAGE HIGH 

    Ignition on, engine not running.

    With the scan tool in Sensors, read the S/C Switch Volts.

    Is the Speed Control voltage above 4.8 volt? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  SPEED CONTROL SWITCH 
    Fig 1: CHECKING SPEED CONTROL SWITCH NO. 1 SIGNAL CIRCUIT
    GC0041721Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Remove the Speed Control Switch per Service Information.

    With the scan tool in Sensors, monitor the S/C Switch Volts.

    With the S/C Switch disconnected, the S/C Switch Volts should equal 5.0 volts.

    Connect a jumper wire between the (V71) S/C Switch No. 1 signal circuit and the (V937/K914) S/C Switch Return circuit in the S/C Switch harness connector.

    Turn the ignition on.

    With the jumper wire in place, the S/C Switch Volts should equal 0 volts.

    Does the S/C Switch Volts display on the scan tool as described? 

    Yes 

    1. Go To  3).

    No 

    1. Replace the Speed Control Switch.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  3. 3)  (V71) S/C SWITCH NO. 1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 2: MEASURING FOR VOLTAGE AT THE S/C SWITCH NO. 1 SIGNAL CIRCUIT
    GC0041722Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Speed Control Switch harness connector.

    Disconnect the PCM harness connector.

    Measure the voltage of the (V71) S/C Switch No. 1 signal circuit in the Speed Control Switch harness connector.

    Is the is the voltage above 5.0 volts? 

    Yes 

    1. Repair the (V71) S/C Switch No. 1 signal circuit for a short to battery voltage.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)  (V937/K914) S/C SWITCH RETURN CIRCUIT OPEN 
    Fig 3: MEASURING RESISTANCE OF THE S/C SWITCH RETURN CIRCUIT
    GC0041723Courtesy of DAIMLERCHRYSLER CORP.
    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 (V937/K914) S/C Switch Return circuit from the Speed Control Switch harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Repair the open (V937/K914) S/C Switch Return circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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