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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) CHECK POWERTRAIN CONTROL MODULE POWER AND GROUND 

    Refer to the Engine Electrical Diagnostics 1.6L and perform the symptom Checking PCM Power and Ground Circuits.

    Did the vehicle pass this test? 

    Yes 

    1. Go to step  2).

    No 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.
  2. 2) SCI CIRCUITS SHORTED TO GROUND 
    Fig 1: Measuring Resistance Between Ground & SCI Circuits
    GC0043447Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the scan tool from the DLC.

    Disconnect the Powertrain Control Module harness connector.

    Measure the resistance between ground and the (D223) SCI Transmit (PCM) circuit.

    Measure the resistance between ground and the (D123) SCI Receive (PCM) circuit.

    Is the resistance below 10.0 ohms for either circuit? 

    Yes 

    1. Repair the SCI Circuit that measured below 10.0 ohms for a short to ground.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.

    No 

    1. Go to step  3).
  3. 3) SCI CIRCUITS SHORTED TO VOLTAGE 
    Fig 2: Measuring Voltage Of SCI Transmit Circuits
    GC0043448Courtesy of CHRYSLER LLC

    Turn the ignition on.

    Measure the voltage of the (D223) SCI Transmit (PCM) circuit.

    Measure the voltage of the (D123) SCI Receive (PCM) circuit.

    Is the voltage above 1.0 volt for either circuit? 

    Yes 

    1. Repair the SCI Circuit that measured above 1.0 volt for a short to voltage.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.

    No 

    1. Go to step  4).
  4. 4) (D223) SCI TRANSMIT (PCM) CIRCUIT OPEN 
    Fig 3: Checking SCI Transmit (PCM) Circuit For An Open
    GC0043449Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance of the (D223) SCI Transmit (PCM) circuit between the DLC and the PCM connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to step  5).

    No 

    1. Repair the (D223) SCI Transmit (PCM) circuit for an open.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.
  5. 5) (D123) SCI RECEIVE (PCM) CIRCUIT OPEN 
    Fig 4: Measuring Resistance of SCI Receive (PCM) Circuit Between The DLC & PCM Connector
    GC0043450Courtesy of CHRYSLER LLC

    Measure the resistance of the (D123) SCI Receive (PCM) circuit between the DLC and the PCM connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to step  6).

    No 

    1. Repair the (D123) SCI Receive (PCM) circuit for an open.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.
  6. 6) (D223) SCI TRANSMIT (PCM) CIRCUIT SHORTED TO THE (D123) SCI RECEIVE (PCM) CIRCUIT 
    Fig 5: Measuring Resistance Between SCI Transmit & SCI Receive Circuits
    GC0043451Courtesy of CHRYSLER LLC

    Measure the resistance between the (D223) SCI Transmit (PCM) and the (D123) SCI Receive (PCM) circuits.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (D223) SCI Transmit (PCM) circuit for a short to the (D123) SCI Receive (PCM) circuit.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.

    No 

    1. Replace the Powertrain Control Module in accordance with the service information.
    2. Perform POWERTRAIN VERIFICATION TEST VER 1.
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