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Home >> Jeep >> 2022 >> Gladiator Mojave, Part Time T/Case Control, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (8HP75 Automatic Transmission - DTCS P0219-00 To P0776-00) >> DTC Troubleshooting >> P0721-00-Output Shaft Speed Sensor Circuit Performance >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN 
    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  3

    No 

    • Go To  2
  2. CHECK IF THE DTC SET DURING A 4L TO 4H SHIFT 
    NOTE:

    The P0721-00 can set during a 4L to 4H transfer case shift if the vehicle transmission is shifted from N to D before the transfer case completes its shift to 4H. If the transmission is shifted to D before the transfer case completes the shift to 4H, the transfer case will default back to 4L, causing the TCM to set this DTC.

    1. Determine if the P0721-00 set following a failed 4L to 4H transfer case shift.

      Did the P0721-00 set during a 4L to 4H transfer case shift?

      Yes 

      No 

      • Go To  3
  3. CHECK TRANSMISSION FOR INTERNAL FAILURE 
    NOTE:

    This DTC is an indication of a internal Transmission failure.

    1. Remove the Transmission Oil Pan and inspect for excessive debris such as clutch friction material or metal contamination.

      Is there any indication of an internal Transmission failure?

      Yes 

      • Repair internal Transmission as necessary in accordance with the Service Information.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .

      No 

      • Using the schematics as a guide, check the Transmission Control Module (TCM) connector and all related in-line connector terminals for corrosion, damage, or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace and program the TCM in accordance with the Service Information. Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL AND INSTALLATION .
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
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