C121C-TORQUE REQUEST SIGNAL DENIED

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

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

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

2. 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 in accordance with the Service Information.
Perform the POWERTRAIN VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Replace the Anti-Lock Brake Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).