P128E

P128E-TCM POWER CONTROL CIRCUIT 2 OVERCURRENT

For a complete wiring diagram, refer to the Wiring Information.





- When Monitored:
With the ignition on. Battery voltage greater than 10 volts.

- Set Condition:
An overcurrent condition is detected in the TCM Power Control circuit. One Trip Fault. Three good trips to turn off the MIL.





Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview

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

Is the DTC active at this time?

Yes

- Go To 2

No

- Go To 4

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

Are there any Input or Output Speed Sensor or Transmission Range Sensor (TRS) DTCs present?

Yes

- Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Go To 3

3. CHECK THE TCM
1. Disconnect the amp meter from the TIPM C10 harness connector and battery positive.
2. Disconnect the TCM C1 harness connector.
3. Connect the positive probe of an ammeter to battery positive and connect the negative probe to the (T16) Transmission Control Output circuit in the TIPM C10 harness connector.
4. Read the amperage on the ammeter.

Does the amperage read below 2.0 amps?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Replace the Totally Integrated Power Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this 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.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the CVT TRANSMISSION VERIFICATION TEST. CVT Transmission Verification Test.

No

- Test Complete.