P128C

P128C-TCM POWER CONTROL CIRCUIT 2 HIGH - TIPM





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Ignition on with battery voltage greater than 10.0 volts.

- Set Condition:
The TIPM detects voltage present on the Transmission Control Output circuit when voltage is not supposed to be present.





Diagnostic Test

1. CHECK IF THE DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, read DTCs.
Is the status Active for this DTC?

Yes

- Go to 2

No

- Go to 4

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




Turn the ignition off
Disconnect the TIPM C10 harness connector.
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 Miller tool #8815 to perform diagnosis.

Measure the voltage of the (T16) Transmission Control Output circuit.
Is the voltage above 10.0 v?

Yes

- Repair the (T16) Transmission Control Output circuit for a short to voltage.
- Perform 62TE VERIFICATION TEST Transmission Verification Test

No

- Go to 3


3. TOTALLY INTEGRATED POWER MODULE
Using the schematics as a guide, check the TIPM harness connector terminals for corrosion, damage, or terminal push out and repair as necessary. Pay particular attention to all power and ground circuits.
Were any problems found?

Yes

- Repair as necessary.
- Perform 62TE VERIFICATION TEST Transmission Verification Test

No

- Replace the Totally Integrated Power Module.
- Perform 62TE VERIFICATION TEST Transmission Verification Test

4. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
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 62TE VERIFICATION TEST Transmission Verification Test

No

- Test complete.