C121C–TORQUE REQUEST SIGNAL DENIEDFor 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 Test1. CHECK FOR A DTC C121C-TORQUE REQUEST SIGNAL DENIEDThis 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. ESP TORQUE REQUEST SIGNALEngine 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).