C0241

C0241-PWM DELIVERED TORQUE REDUCTION MALFUNCTION









The EBTCM and the PCM/ECM simultaneously control the traction control. The PCM/ECM reduces the amount of torque supplied to the drive wheels by retarding spark timing and selectively turning off fuel injectors. The EBTCM actively applies the brakes to the front wheels in order to reduce torque.
The EBTCM sends a requested torque message via Pulse Width Modulated (PWM) signal to the PCM/ECM. The duty cycle of the signal is used to determine how much engine torque the EBTCM is requesting to the PCM/ECM to deliver. Normal values are between 10 and 90 percent duty cycle. The signal should be at 90 percent when traction control is not active and at lower values during traction control activations. The PCM/ECM supplies a pull up voltage of 5 volts that the EBTCM switches to ground to create the signal.

DTC PARAMETERS
DTC C0241 will set if the following conditions exist:
^ The PCM/ECM does not receive the requested torque signal (open or shorted circuit).
^ An incorrect requested torque signal is detected by the PCM/ECM. A PWM signal is sent back to the EBTCM via the delivered torque circuit.

When DTC C0241 sets:
^ Traction control will be disabled.
^ The traction Off indicator turns ON.
^ The ABS remains functional.

DIAGNOSTIC AIDS
Possible causes for DTC C0241 to set:
^ Open in the requested torque circuit.
^ Requested torque circuit shorted to ground or voltage.
^ Requested torque circuit has a wiring problem, terminal corrosion, or poor connection.
^ PCM/ECM not receiving information from EBTCM.