C121C-TORQUE REQUEST SIGNAL DENIED
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the engine running.
- Set Condition:
When the Powertrain Control Module indicates, for an extended period of time, that engine management relevant for Automatic Yaw Control/Traction Control System control can not be accomplished.
| Possible Causes |
| ANTI-LOCK BRAKE MODULE |
| POWERTRAIN CONTROL MODULE |
Diagnostic Test
1. CHECK FOR A DTC C121C-TORQUE REQUEST SIGNAL DENIEDNOTE: This DTC must be active for the results of this test to be valid and this DTC may set while driving under severe load conditions.
Turn the ignition on.
With the scan tool, read and record DTCs.
With the scan tool, read and record Freeze Frame information.
With the scan tool, erase DTCs.
Cycle the ignition switch from off to on.
Start Engine.
With the scan tool, read and record DTCs.
Does the scan tool display: C121C-TORQUE REQUEST SIGNAL DENIED?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION diagnostic procedure.
- Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)
2. CHECK THE POWERTRAIN DTCS
With the scan tool, read and record Powertrain DTCs.
Were any Powertrain related DTCs found?
Yes
- Repair the Powertrain System in accordance with the Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 3
3. ESP TORQUE REQUEST SIGNAL
Engine started.
With the scan tool, read the Allow ESP Torque Request status bit.
Was the Allow ESP Torque Request showing NOT set?
Yes
- Replace the Powertrain Module in accordance with the Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace the Anti-Lock Brake Module in accordance with the Service Information.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).