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Home >> Jeep >> 2007 >> Commander Base, 3.7 K, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Nag1 Automatic Transmission - Electrical Diagnostics >> Nag1 - Electrical Diagnostics >> DTC Troubleshooting >> U1509-Implausible Engine Variant Message Data Length Received >> Diagnostic Test

Diagnostic Test

  1. 1) CHECK FOR FCM CAN BUS DTCS 

    With the scan tool, read FCM DTCs.

    Are there any FCM CAN BUS DTCs present? 

    Yes 

    1. Refer to DIAGNOSIS AND TESTING and perform the appropriate symptom(s).
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .

    No 

    1. Go to  2).
  2. 2) CHECK IF ECM/PCM DTCS ARE PRESENT 

    With the scan tool, read ECM/PCM DTCs.

    Are there any ECM/PCM DTCs present? 

    Yes 

    1. Refer to appropriate Engine ELECTRICAL DIAGNOSTICS article and perform the appropriate symptom.
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .

    No 

    1. Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM per the Service Information. Refer to MODULE-TRANSMISSION CONTROL .
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
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