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Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. TEST FOR INTERMITTENT CONDITION 

    Turn the ignition on.

    NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

    With the scan tool, select ECU View.

    NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.
    NOTE: Check the TIPM for any active CAN C hardware and any ignition related DTCs, perform appropriate DTCs before proceeding.

    Does the scan tool display a red X next to the module? 

    Yes 

    1. Go To step  2.

    No 

    1. The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  2. CHECK THE (Z910) GROUND CIRCUIT FOR AN OPEN 
    Fig 1: Checking Transmission Control Module Ground Circuit - NAG1
    GC0015841Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Transmission Control Module C1 harness connector.

    Using a 12-volt test light connected to 12-volts, check the (Z910) ground circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  3.

    No 

    1. Repair the (Z910) ground circuit for an open.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
  3. (F942) FUSED TRANSMISSION RELAY OUTPUT CIRCUIT OPEN OR SHORTED 
    Fig 2: Checking Transmission Control Module Fused Run Relay Output Circuit - NAG1
    GC0015842Courtesy of CHRYSLER LLC

    Turn the ignition on.

    Using a 12-volt test light connected to ground, check the (F942) Fused Transmission Relay Output circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  4.

    No 

    1. Repair the (F942) Fused Transmission Relay Output circuit for an open or short.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
  4. (D65) CAN C BUS (+) CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of (D65) CAN C Bus (+) Circuit Between TIPM C6 Harness Connector & TCM Harness Connector
    GC0070139Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the TIPM C6 harness connector.

    Disconnect the TCM C2 harness connector.

    Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM C6 harness connector and the TCM harness connector.

    Is resistance below 5.0 ohms? 

    Yes 

    1. Go To step  5.

    No 

    1. Repair the (D65) CAN C Bus (+) circuit for an open.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
  5. (D64) CAN C BUS (-) CIRCUIT OPEN 
    Fig 4: Measuring Resistance Of (D64) CAN C Bus (-) Circuit Between TIPM C6 Harness Connector & TCM Harness Connector
    GC0070140Courtesy of CHRYSLER LLC

    Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM C6 harness connector and the TCM harness connector.

    Is resistance below 5.0 ohms? 

    Yes 

    1. Replace the Transmission Control Module in accordance with the service information.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .

    No 

    1. Repair the (D64) CAN C Bus (-) circuit for an open.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
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