Diagnostic Test

CHECK FOR AN ACTIVE CONDITION
1. Turn the ignition on.
2. With the scan tool, read all DTCs and record on the repair order.
3. With the scan tool, erase DTCs.
4. Raise the vehicle on the hoist.
5. Start the Engine.
6. With the scan tool, monitor the Output Speed Sensor rpm.
7. Firmly apply the brakes and place the gear selector in Drive.
  WARNING:
  To avoid personal injury or death, keep hands and feet clear of rotating wheels.
8. Release the brakes and raise the engine speed to allow the Transmission to perform a 1-2 and a 2-3 upshift.
  Did the Output Speed Sensor display below 1, 000 rpm?
  
  Yes
  - Go To 2
  No
  - Go To 3
CHECK TRANSMISSION FOR INTERNAL FAILURE
1. Turn the ignition off.
2. 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. Refer to REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST - 948TE 9HP48 .
  No
  
  NOTE:
  If this Electronic Control Unit (ECU) is being replaced with a new unit, a diagnostic scan tool MUST be used to align the PROXI configuration data into the new ECU. Follow the routine outlined in the diagnostic scan tool for PROXI Configuration Alignment under Body Control Module (BCM) Miscellaneous Functions menu.
  - Using the schematics as a guide, check the Transmission Control Module (TCM) terminals and connectors for corrosion, damage or pushed out terminals. Pay particular attention to the power and ground circuits. If no problems are found, replace the TCM and perform programming and PROXI Configuration Alignment procedures. Refer to MODULE, TRANSMISSION CONTROL (TCM), REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST - 948TE 9HP48 .
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 - 948TE 9HP48 .
  No
  - Test complete.