Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
NOTE:
Diagnose Powertrain Control Module (PCM) and communication DTCs before proceeding. If no PCM or communication DTCs are set, diagnose Anti-Lock Brake System (ABS) DTCs before proceeding.
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
- Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
VEHICLE SPEED RELATED DTCS
1. Using the DTC data recorded earlier, check for vehicle speed related DTCs in other modules.
2. Perform any Service Bulletins that may apply.
  Were any vehicle speed related DTCs in other modules present?
  
  Yes
  - Perform the appropriate diagnostic procedure in accordance with the Service Information.
  No
  - Go To 3
INSPECT THE OUTPUT SPEED SENSOR
1. Remove the Transmission Oil Pan in accordance with the Service Information.
  NOTE:
  If excessive debris is found in the Transmission Oil Pan, correct the cause of the debris before proceeding with this Diagnostic Test.
2. If equipped, remove the Hydraulic Impulse Solenoid (HIS).
3. Inspect the Output Speed Senor for proper installation.
  Is the Output Speed Sensor properly installed?
  
  Yes
  - 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 8HP50/850RE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
CHECK OUTPUT SPEED SENSOR FOR DAMAGE
1. Carefully remove the Output Speed Sensor from the transmission case.
2. Inspect the Output Speed Sensor for any visible damage.
  Is there any damage to the Output Speed Sensor?
  
  Yes
  - 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 8HP50/850RE TRANSMISSION VERIFICATION TEST .
  No
  - Properly install the Output Speed Sensor in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 8HP50/850RE TRANSMISSION VERIFICATION TEST .