C121C-TORQUE REQUEST SIGNAL DENIED
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
When the Anti-Lock Brake Module indicates if engine management relevant for Automatic Yaw Control/Traction Control System control can 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.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
2. CHECK THE POWERTRAIN DTC'S
With the scan tool, read and record Powertrain DTCs.
Were any Powertrain ESP related DTCs found?
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).