Diagnostic Test

1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
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 When Monitored and Set Conditions above and recorded data, 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 INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .

1. Turn the ignition OFF.
2. Disconnect the PCM C2 harness connector.
   CAUTION:

   Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.

3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
4. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
5. Connect a fused jumper wire or a 12 volt test light connected to 12 volts to the (T15) Transmission Control circuit on the appropriate terminal GPEC Diagnostic Adapter to actuate the internal TCM relay in the PDC.
6. Ignition ON, Engine Not Running.
7. Measure the voltage of the (T147) 2C, (T48) 4C, (T50) L/R, (T9) OD and (T29) UD Pressure Signal circuits in the PCM Pinout Box.

   Is the voltage above 0.5 volts on any of the measured circuits?

   Yes 

   • Repair the (T147) 2C, (T48) 4C, (T50) L/R, (T9) OD and/or (T29) UD Pressure Signal circuit(s) for a short to voltage.
   • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .

   No 

   • Go To  3

1. Turn the ignition OFF.
2. Remove the jumper wire or 12-volt test light from the (T15) Transmission Control circuit at the GPEC Diagnostic Adapter.
3. Reconnect the Transmission Solenoid/TRS Assembly harness connector.
4. Ignition ON, Engine Not Running.
5. Measure the voltage of the (T147) 2C, (T48) 4C, (T50) L/R, (T9) OD and (T29) UD Pressure Signal circuits in the PCM Pinout Box.

   Is the voltage above 0.5 volts on any of the sense circuits?

   Yes 

   • Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Refer to ASSEMBLY, TRANSMISSION SOLENOID AND TRS, REMOVAL AND INSTALLATION .
   • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .

   No 

   NOTE:

   This transmission is equipped with a solenoid for the Torque Converter Clutch (TCC) that is a Variable Force Solenoid (VFS) with close tolerance Pressure/Inductance (PI) curve. If replacing the PCM, it is necessary to transfer the PI data from the old PCM to the new PCM using the scan tool. If the PCM being replaced is non-responsive, the PI data can be retrieved from a 2-D bar code on the exterior of the transmission case. This is done with the scan tool using the "Program Torque Converter Solenoid PI Curve" routine.

   Early build transmissions will have the 2-D barcode label on the right side of the transmission case. Late build transmissions will have the label attached to a machined pad at the top of the case, near the rear of the transmission. The data must be entered into the scan tool in order to upload the information to the PCM. In the event that the exterior BAR code is missing, or it is suspected that the valve body or TCC solenoid has been replaced without uploading the correct PI data into an existing PCM, the transmission oil pan must be removed to retrieve the information from the 2-D bar code on the body of the TCC solenoid.

   • Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM in accordance with the Service Information. Refer to REMOVAL AND INSTALLATION .
   • With the scan tool, perform Quick Learn.
   • Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .