C121C

C121C-TORQUE REQUEST SIGNAL DENIED

For a complete wiring diagram, refer to the Wiring Information.

- 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.





1. CHECK FOR A DTC C121C-TORQUE REQUEST SIGNAL DENIED

NOTE: 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.

1. Turn the ignition on.
2. With the scan tool, read and record DTCs.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase DTCs.
5. Cycle the ignition switch from off to on.
6. Start Engine.
7. With the scan tool, read and record DTCs and monitor ESP Torque Request status.

Does the scan tool display: C121C-TORQUE REQUEST SIGNAL DENIED?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION diagnostic procedure.ABS Intermittent Condition Test.

2. CHECK THE POWERTRAIN DTCS
1. With the scan tool, read and record Powertrain DTCs.

Were any Powertrain related DTCs found?

Yes

- Repair the Powertrain diagnostics Testing and Inspection.

No

- Go To 3

3. ESP TORQUE REQUEST SIGNAL
1. Engine started.
2. 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.
- Perform POWERTRAIN VERIFICATION TEST Powertrain Verification Test.

No

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST ABS Verification Test.