Diagnostic Instructions
DTC Descriptors
DTC C0244: Pulse Width Modulated (PWM) Delivered Torque
DTC P1689: Traction Control Delivered Torque Output Circuit
Circuit/System Description
The electronic brake control module (EBCM) and the powertrain control module (PCM) simultaneously control the Traction Control System (TCS). The PCM sends a Delivered Torque message via a pulse width modulated (PWM) signal to the EBCM. The duty cycle of
the signal is used to determine how much engine torque the PCM is delivering.
Conditions for Running the DTC
The ignition is ON and the engine is running.
Conditions for Setting the DTC
| • | Pulse signals from the Delivered Torque signal are not detected or are abnormal. |
| • | The Duty Cycle is less than 5 percent or more than 95 percent. |
Action Taken When the DTC Sets
| • | The EBCM disables TCS and vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | The Stability Caution indicator turns ON. |
| • | The driver information center (DIC) displays the TRACTION FAILED message. |
| • | The DIC displays the SERVICE STAB SYS message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Testing
- Use a scan tool in order to clear the DTCs. Cycle the ignition to OFF and then start the engine. A current failure will set a DTC.
| ⇒ | If the DTC does not reset, go to Diagnostic Aids. |
- Turn OFF the ignition and disconnect the PCM harness connector. At the PCM harness connector, use a DMM to measure for 12 volts on the delivered torque circuit. Turn ON the ignition.
| ⇒ | If the voltage is below 10 volts, test for an open or short to ground on the requested torque circuit or replace the EBCM/brake pressure modulator valve (BPMV) assembly. |
- Connect one end of a test lamp to ground. With the DMM still connected to the PCM harness connector, touch the other end of the test lamp to the DMM lead connected to the PCM harness connector. The DMM voltage reading should drop below 0.5 volt.
| ⇒ | If the voltage does not drop to below 0.5 volt, check for a short to voltage on the requested torque circuit. If a short to voltage cannot be found, replace the EBCM/brake pressure modulator valve (BPMV) assembly. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for EBCM/BPMV or PCM replacement, setup, and programming
