DIAGNOSIS AND TESTING
P129C-INVERTER CONTROL CIRCUIT 2 HIGH (TIPM)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on. Battery voltage greater than 10 volts. Once the inverter switch has been turned on, the CCN sends a request to the TIPM to turn on the Inverter.
- Set Condition:
An open or shorted high condition has been detected in the Inverter Control output circuit by the TIPM. One Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
| (P805) INVERTER CONTROL OUTPUT CIRCUIT OPEN |
| (P805) INVERTER CONTROL OUTPUT CIRCUIT SHORTED TO VOLTAGE |
| INVERTER MODULE |
| TIPM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1. ACTIVE DTCIgnition on, engine not running.
With a scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
2. (P805) INVERTER CONTROL OUTPUT CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Inverter Module harness connector.
Disconnect the TIPM C7 harness connector.
Turn the ignition on.
Measure the voltage of the (P805) Inverter Control Output circuit at the Inverter Module harness connector.
Is voltage present?
Yes
- Repair the short to voltage in the (P805) Inverter Control Output circuit. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Go To 3
3. INVERTER MODULE
Turn the ignition off.
Reconnect the TIPM harness connector.
Using a test light connected to ground, probe the Inverter Enable Switch Signal circuit at the Inverter Module harness connector.
Using the scan tool, actuate the Inverter Enable control.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Replace the Inverter Module per Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 4
4. (P805) INVERTER CONTROL OUTPUT CIRCUIT OPEN
Turn the ignition off.
Disconnect the TIPM harness connector.
Disconnect the Inverter Module harness connector.
Measure the resistance of the (P805) Inverter Control Output circuit between the TIPM and Inverter Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Replace the Totally Integrated Power Module per Service Information.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Repair the open in the (P805) Inverter Control Output circuit. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
P129E-INVERTER CONTROL CIRCUIT OVERCURRENT (TIPM)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts.
- Set Condition:
An overcurrent condition is detected in the Inverter Control Output circuit. One Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
| TERMINAL DAMAGE OR CORROSION |
| (P805) INVERTER CONTROL OUTPUT CIRCUIT SHORTED TO GROUND |
| INVERTER MODULE |
| TIPM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1. ACTIVE DTCIgnition on, engine not running.
NOTE: Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a load test before continuing.
With a scan tool, select View DTCs.
Look closely at the temperatures at which this DTC set.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
2. (P805) INVERTER CONTROL OUTPUT CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the TIPM harness connector.
Disconnect the Inverter Module harness connector.
Inspect the wiring connections for corrosion and repair as necessary.
Measure the resistance between ground and the (P805) Inverter Control Output circuit at the Inverter Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Go To 3
No
- Repair the short to ground in the (P805) Inverter Control Output circuit. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
3. INVERTER MODULE
Turn the ignition off.
Reconnect the TIPM harness connector.
Using a test light connected to ground, probe the Inverter Enable Switch Signal circuit at the Inverter Module harness connector.
Using the scan tool, actuate the Inverter Enable control.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes
- Replace the Inverter Module per Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace the Totally Integrated Power Module per Service Information.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)