C0244

DTC C0244





Circuit Description
The electronic brake and traction control module (EBTCM) and the engine control module (ECM) simultaneously control the traction control. The ECM reduces the amount of torque supplied to the drive wheels by retarding spark timing and selectively turning OFF the fuel injectors. The EBTCM actively applies the brakes to the front wheels in order to reduce torque.
The electronic brake control module (EBCM) supplies approximately 12 volts through an internal resistor to the ECM on the delivered torque signal circuit. The ECM toggles this voltage to ground in order to create the delivered torque signal at the EBCM. A signal with a frequency of 128 Hz +/-5 percent and a duty cycle of 25-95 percent is a valid delivered torque signal. The percentage of duty cycle is proportionate to the percentage of delivered engine torque.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0244 Pulse Width Modulated (PWM) Delivered Torque

Conditions for Running the DTC
^ The ignition is ON.
^ The engine is running.

Conditions for Setting the DTC
^ The EBTCM does not receive the delivered torque signal (open or shorted circuit).
^ An incorrect delivered torque signal is detected by the EBTCM.

Action Taken When the DTC Sets
Traction control will be disabled.

Diagnostic Aids
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ If an intermittent malfunction exists,
^ Possible causes for DTC C0244 to set:
^ Open in the torque delivered control circuit
^ Torque delivered control circuit shorted to ground or voltage
^ Communication frequency problem
^ Communication duty cycle problem
^ Torque delivered control circuit has a wiring problem, terminal corrosion, or poor connections
^ EBCM not receiving information from the ECM

Test Description





The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for voltage supplied to the ECM from the EBCM.
4. This step tests for a shorted resistor in the EBCM or a short to voltage within the circuit, by verifying that a large voltage drop occurs in the circuit when the test lamp is placed in parallel with the DMM. The ECM may be damaged if either of these conditions is present.