Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Start the engine and test drive the vehicle in accordance with the monitoring conditions.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR DTCS PRESENT IN THE TRANSMISSION CONTROL MODULE (TCM)
NOTE:
If the scan tool is unable to communicate with the TCM, or if there are related communication DTCs present, perform the appropriate diagnostic procedure.
1. Turn the ignition on.
2. With the scan tool, read DTCs in the TCM.
  Are there any DTCs present in the TCM?
  
  Yes
  - Refer to DTC INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 3
POWERTRAIN CONTROL MODULE (PCM)
1. Inspect the P/N signal circuit for a short to ground, or a short to voltage with the shifter in Drive or Reverse. Perform the appropriate diagnostic procedures in the Transmission article.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Transmission Range Sensor, the TCM, and the PCM.
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
5. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .