P128C

P128C-TCM POWER CONTROL CIRCUIT 2 HIGH - 41TE NGC







- When Monitored:
With the ignition on with the battery voltage greater than 10.0 volts.

- Set Condition:
The Totally Integrated Power Module (TIPM) has detected voltage on the Transmission Control Output circuit when none should be present.





1. CHECK IF THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- Go to 2

No

- Go to 3

2. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the TIPM C10 harness connector.
3. Disconnect the PCM C4 harness connector and install Miller tool #8815.

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 PCM Pinout Box 8815 to perform diagnosis.

4. Measure the voltage of the (T16) Transmission Control Output circuit.

Is the voltage above 0.5 volts?

Yes

- Repair the (T16) Transmission Control Output circuit for a short to voltage.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test.

No

- Using the schematics as a guide, check the Totally Integrated Power Module (TIPM) terminals for corrosion, damage, water intrusion, or terminal push out. Check for any Service Bulletins that may apply. If no problems are found, replace and program the TIPM.
- Perform the BODY VERIFICATION TEST Body Verification Test.

3. INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
3. Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes

- Repair as necessary.
- Perform the 40/41TE TRANSMISSION VERIFICATION TEST 40/41TE Transmission Verification Test.

No

- Test complete.