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Home >> Jeep >> 2018 >> Wrangler Unlimited Moab >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Transmission Control Module (TCM) - DTCS P0219-00 To P1D90-00 >> DTC Troubleshooting >> P1D8F-00-Incorrect Gear Ratio Clutch 1 Defective >> Diagnostic Test

Diagnostic Test

  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN 
    NOTE:

    With the scan tool, read Transmission Control Module (TCM) DTCs and record the Event and Environmental Data on the repair order as it may be needed to determine the root cause of this DTC. It may be very difficult to reset this DTC so this step is very important.

    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

      • Go To  3
  2. CHECK TRANSMISSION FLUID CONDITION 
    1. Check the Transmission fluid condition.

      Is the Transmission fluid burnt?

      Yes 

      No 

  3. CHECK WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
    3. Wiggle the wires while checking for shorted and open circuits.
    4. Check for any Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

      • Test complete.