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Home >> Jeep >> 2006 >> Commander Base, 3.7 K, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Nag1 Automatic Transmission - Electrical Diagnostics >> Electrical Diagnostics >> DTC Troubleshooting >> U140F-Implausible Engine Variant Data >> 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 ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) category and perform the appropriate symptom(s).
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .

    No 

    1. Go To step  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. DIAGNOSTIC CODE INDEX 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 the TCM per the Service Information. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE - REMOVAL)
    2. Perform NAG1 TRANSMISSION VERIFICATION TEST .
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