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 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.

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 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).