P0864-TCM TORQUE REDUCTION SIGNAL ERROR
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the engine running.
- Set Condition:
The ECM detects a malfunction on the Torque Management Request Signal circuit.
| Possible Causes |
| ENGINE CONTROL MODULE |
| TORQUE MANAGEMENT REQUEST SIGNAL CIRCUIT OPEN |
| TORQUE MANAGEMENT REQUEST SIGNAL CIRCUIT SHORTED TO GROUND |
| TORQUE MANAGEMENT REQUEST SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| TRANSMISSION CONTROL MODULE |
| INTERMITTENT CONDITION |
Diagnostic Test
1.CHECKING THE TORQUE MANAGEMENT REQUEST SIGNAL
Is the voltage steady between 4.5 and 5.5 volts while wiggling the wiring and connectors?
Yes
- Go To 2
No
- Go To3
2.TRANSMISSION CONTROL MODULE
Did this DTC set again?
Yes
- Replace and program the Transmission Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Test Complete.
3.TORQUE MANAGEMENT REQUEST SIGNAL CIRCUIT OPEN
Is the resistance below 10.0 ohms?
Yes
- Go To4
No
- Repair the Torque Management Request Signal circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4.TORQUE MANAGEMENT REQUEST SIGNAL CIRCUIT SHORTED TO GROUND
Is the resistance above 1000 ohms?
Yes
- Go To5
No
- Repair the Torque Management Request Signal circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5.TORQUE MANAGEMENT REQUEST SIGNAL CIRCUIT SHORTED TO VOLTAGE
Is the voltage below 1.0 volt?
Yes
- Replace and program the Engine Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Repair the Torque Management Request Signal circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).