Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Transmission Control Module (TCM) DTCs and record on the repair order.
2. Record the Event Data and Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read TCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK MANUAL PARK RELEASE CABLE
1. Disconnect the Manual Park Release (MPR) cable at the transmission. Refer to CABLE, MANUAL PARK RELEASE, REMOVAL AND INSTALLATION .
2. With the scan tool, erase DTCs.
3. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
4. With the scan tool, read TCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 3
  No
  - Inspect the MPR cable for damage and proper routing. Restore the proper routing or replace the MPR cable in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
CHECK INTERNAL PARK LOCK HARDWARE
1. Remove the Valve Body and inspect the Park Lock hardware and solenoids for binding and damage. Refer to VALVE BODY, REMOVAL AND INSTALLATION .
  Were any problems found?
  
  Yes
  - Repair the Park Lock Hardware or Solenoid in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  No
  - Replace the Valve Body in accordance with the Service Information.
    Refer to VALVE BODY, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .