P128B-TCM POWER CONTROL CIRCUIT 2 LOW - TIPM
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
- Set Condition:
A shorted condition is detected in the Transmission Control Output circuit.
| Possible Causes |
| (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT SHORT TO GROUND |
| (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
Diagnostic Test
1. CHECK IF THE DTC IS ACTIVEIgnition on, engine not running.
With the scan tool, check Transmission DTCs.
Are there any Speed Sensor or Transmission Range Sensor DTCs present?
Yes
- Refer to the transmission category and perform the appropriate symptom(s).
No
- Go to 2
2. CHECK IF THE DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, check TIPM DTCs.
Is the status Active for this DTC?
Yes
- Go to 3
No
- Go to 6
3. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT SHORT TO GROUND
Turn the ignition off
Disconnect the TIPM C8 harness connector.
Disconnect the TCM C1 harness connector.
Measure the resistance between ground and the (T16) Transmission Control Output circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (T16) Transmission Control Output circuit for a short to ground.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Go to 4
4. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN
Turn the ignition off to the lock position.
Connect the TIPM C8 harness connector.
Ignition on, engine not running.
Using the scan tool under the TIPM Actuators, actuate the Transmission.
Using a 12-volt test light connected to ground, check the (T16) Transmission Control Output circuits.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly at all the (T16) Transmission Control Output circuits?
Yes
- Go To 5
No
- Repair the (T16) Transmission Control Output circuit for an open.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
5. TOTALLY INTEGRATED POWER MODULE
Using the schematics as a guide, inspect the wire harness and connectors.
Check the TIPM harness connector terminals for corrosion, damage, or terminal push out.
Pay particular attention to all power and ground circuits.
Were any problems found?
Yes
- Repair as necessary.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Replace and program the TIPM per Service Information.
- Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
6. 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 CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)
No
- Test complete.