Diagnostic Test

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

CHECK FOR INCORRECT GEAR RATIO DIAGNOSTIC TROUBLE CODES (DTCS)
1. With the scan tool, read Transmission Control Module (TCM) DTCs and record on the repair order.
  Are any Incorrect Gear Ratio DTCs set?
  
  Yes
  - Repair Incorrect Gear Ratio DTCs. Refer to 8HP70 AUTOMATIC TRANSMISSION - DIAGNOSTIC CODE INDEX .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. With the scan tool, read TCM DTCs.
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 3
  No
  - Go To 4
CHECK TRANSMISSION FLUID LEVEL
1. Check the Transmission fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE .
  Was the Transmission fluid level at the correct level?
  
  Yes
  - Using the schematics as a guide, check the 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 PROGRAMMING
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Check transmission for leaks and repair in accordance with the Service Information.
  - Fill Transmission to the proper fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
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
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Test complete.