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Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1) ACTIVE DTC 

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2) (F856) 5 VOLT SUPPLY CIRCUIT OPEN 

    Turn the ignition off.

    Disconnect the Vehicle Speed Sensor harness connector.

    Turn the ignition on.

    Measure the voltage of the (F856) 5 Volt Supply circuit in the VSS harness connector.

    Is the voltage above 4.6 volts? 

    Yes 

    1. Go to  3).

    No 

    1. Repair the (F856) 5 Volt Supply circuit for an open.
    2. Perform POWERTRAIN VERIFICATION TEST .
  3. 3) VSS SIGNAL 
    Fig 1: Measuring For Voltage On VSS Signal Circuit
    GC0041689Courtesy of CHRYSLER LLC

    Measure the voltage of the (K75) VSS Signal circuit in the VSS harness connector.

    Is the voltage between 4.5 to 5.0 volts? 

    Yes 

    1. Go to  4).

    No 

    1. Go to  5).
  4. 4) (K914) SENSOR GROUND CIRCUIT OPEN 
    Fig 2: Measuring Resistance Of The VSS Sensor Ground Circuit
    GC0041690Courtesy of CHRYSLER LLC
    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 (K914) VSS Sensor Ground circuit between the VSS harness connector and to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Remove and inspect the Pinion Gear. If OK, replace the Vehicle Speed Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST VER - 5.

    No 

    1. Repair the (K914) Sensor ground circuit for an open.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5) (K75) VSS SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 3: Measuring Resistance Of Vehicle Speed Sensor Signal Circuit
    GC0041691Courtesy of CHRYSLER LLC

    Disconnect the PCM harness connector.

    Measure the resistance of the (K75) Vehicle Speed Sensor Signal circuit in the VSS harness connector to ground.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the (K75) VSS Signal circuit for a short to ground.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  6).
  6. 6) (K75) VSS SIGNAL CIRCUIT OPEN 
    Fig 4: Measuring Resistance Of VSS Signal Circuit
    GC0041692Courtesy of CHRYSLER LLC
    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 (K75) VSS Signal circuit between the VSS harness connector and to the appropriate terminal of special tool #8815.

    Is the resistance below 5 ohms? 

    Yes 

    1. Go to  7).

    No 

    1. Repair the (K75) VSS Signal circuit for an open.
    2. Perform POWERTRAIN VERIFICATION TEST .
  7. 7) PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage or terminal push out. Repair as necessary.

    If 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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