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Home >> Jeep >> 2007 >> Liberty Limited, RWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0503 To P060B - Gas >> P0580-Speed Control Switch 1 Circuit Low >> Diagnostic Test

Diagnostic Test

  1. 1) ACTIVE DTC 
    NOTE: Do not press any of the Speed Control Switch buttons.

    Ignition on, engine not running.

    With a scan tool, select View DTCs.

    Is the DTC Active at this time? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) SPEED CONTROL SWITCHES 

    Turn the ignition off.

    Remove and disconnect the Speed Control Switches from the steering wheel per Service Information.

    Measure the resistance across each Speed Control Switch.

    Monitor the ohmmeter while pressing each function button on each switch.

    The following resistance specs are taken between terminals (V37) S/C Switch No.1 Signal and (K914) S/C Switch Return circuits of the Switch when holding the switch button in the following positions.

    Not pressing any switch - 20.5 kohms

    On/Off - 0.47 kohms

    Set - 5.49 kohms

    Coast - 2.94 kohms

    Cancel - 1.24 kohms

    Resume/Accel - 15.4 kohms

    Does the function on the Speed Control Switches have the correct resistance value? 

    Yes 

    1. Go to  3).

    No 

    1. Replace the Speed Control Switch that had the incorrect resistance value.
    2. Perform POWERTRAIN VERIFICATION TEST .
  3. 3) SPEED CONTROL ON/OFF SWITCH 

    Connect the Resume/Accel Switch.

    Ignition on, engine not running.

    With the scan tool, monitor the Speed Control Switch voltage.

    Disconnect the Speed Control On/Off Switch harness connector.

    Did the voltage change to above 4.8 volts? 

    Yes 

    1. Replace the Speed Control On/Off Switch.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) SPEED CONTROL RESUME/ACCEL SWITCH 

    With the scan tool, monitor the Speed Control Switch voltage.

    Disconnect the Speed Control Resume/Accel Switch harness connector per Service Information.

    Did the voltage change to above 4.8 volts? 

    Yes 

    1. Replace the Speed Control Resume/Accel Switch.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  5).
  5. 5) CLOCKSPRING 

    Turn the ignition off.

    Disconnect the C1 Clockspring harness connector per Service Information.

    Ignition on, engine not running.

    With the scan tool, read the S/C Switch voltage.

    Did the S/C Switch volts change to 5.0 volts? 

    Yes 

    1. Replace the Clockspring.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  6).
  6. 6) (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (K914) S/C SWITCH RETURN CIRCUIT 
    Fig 1: Checking Switch No. 1 Signal Circuit Shorted To Switch Return Circuit
    GC0056814Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C3 Clockspring harness connector.

    Disconnect the C3 PCM harness connector.

    Measure the resistance between the (K914) S/C Switch Return circuit and the (V37) S/C Switch No.1 Signal circuit at the S/C Switch harness connectors.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (V37) S/C Switch No.1 Signal circuit and the (K914) S/C Switch Return circuit between the Switch and Clockspring.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  7).
  7. 7) (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (K914) S/C SWITCH RETURN CIRCUIT 
    Fig 2: Measuring Resistance Between Speed Control Switch No. 1 Signal Circuit & Switch Return Circuit In C1 Clockspring Harness Connector
    GC0056828Courtesy of CHRYSLER LLC

    Measure the resistance between the (V37) S/C Switch No.1 Signal circuit and the (K914) S/C Switch Return circuit in the C1 Clockspring harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (V37) S/C Switch No.1 Signal circuit and the (K914) Switch Return circuit between the Clockspring and the PCM.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  8).
  8. 8) (V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 3: Testing Speed Control Switch No. 1 Signal Circuit For Short To Ground
    GC0056829Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (V37) S/C Switch No.1 Signal circuit in the S/C Switch harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (V37) S/C Switch No.1 Signal circuit between the Switch and Clockspring.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  9).
  9. 9) (V37) S/C NO.1 SWITCH SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 4: Checking Speed Control Switch No. 1 Signal Circuit For Short To Ground
    GC0056816Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (V37) S/C Switch No.1 Signal circuit in the C1 Clockspring harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (V37) S/C Switch No.1 Signal circuit between the Clockspring and PCM.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  10).
  10. 10) SPEED CONTROL SWITCH VOLTAGE VALUES 

    Allow the engine to idle.

    With a scan tool, monitor the S/C Switch voltage readings.

    SWITCH POSITION  SWITCH No.1 VOLTAGE VALUE  SWITCH No.2 VOLTAGE VALUE 
    NO SWITCHES PRESSED 4.31 to 4.78 volts 4.31 to 4.78 volts
    ON/OFF PRESSED 0.59 to 1.13 volts 3.53 to 3.92 volts
    RES/ACCEL PRESSED 3.88 to 4.17 volts 2.04 to 2.47 volts
    SET PRESSED 3.16 to 3.56 volts 1.17 to 1.56 volts
    COAST PRESSED 2.57 to 2.94 volts 0.77 to 1.09 volts
    CANCEL PRESSED 1.59 to 1.99 volts 2.84 to 3.25 volts

    Take these same voltage measurements with a voltmeter by back probing the (V37) S/C Switch No.1 Signal circuit at the switches.

    Compare the voltage readings on the voltmeter to what the scan tool displayed.

    Are the voltage readings out of the listed specification and is there less than a 0.2 of a volt difference between the voltmeter switch values and the scan tool switch value? 

    Yes 

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

    No 

    1. Go to  11).
  11. 11) 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 POWERTRAIN VERIFICATION TEST .

    No 

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