GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0244 00: Pulse Width Modulated (PWM) Delivered Torque

DTC P1689: Traction Control Delivered Torque Output Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Pulse Width Modulated (PWM) Delivered Torque Signal Circuit

C0244 00

C0244 00

C0244 00

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Traction Control Delivered Torque Signal Circuit

P1689

P1689

P1689

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Circuit Description

Traction control is simultaneously controlled by the electronic brake control module (EBCM) and the powertrain control module (PCM) or engine control module (ECM). The PCM/ECM sends DELIVERED TORQUE message via a Pulse Width Modulated (PWM) signal to the PCM/ECM confirming the delivered torque level for proper Traction Control system operation. The EBCM supplies the pull up voltage.

Conditions for Running the DTC

    • The ignition is ON.
    • The DTC can be set after system initialization.

Conditions for Setting the DTC

A malfunction is detected if one of the following conditions exist:

DTC C0244 can be set anytime when ignition voltage is present. A malfunction exists if the PWM signal is out of range or no signal is received for a period of 2 seconds.

Action Taken When the DTC Sets

If equipped, the following actions occur:

    • The EBCM disables the TCS/VSES for the duration of the ignition cycle.
    • A malfunction DTC will set.
    • The Traction Control Off indicator is illuminated. The ABS remains functional.
    • The Stability Off indicator is illuminated.

Conditions for Clearing the DTC

    • The condition for the DTC is no longer present.
    • The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

    •  Inspect the grounds of both the PCM/ECM and the EBCM, ensuring each ground is clean and torqued to the proper specification.
    • It is 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 refer to Checking Aftermarket Accessories .
    •  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 PCM/ECM.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine ON, observe the scan tool delivered torque signal duty cycle from the PCM/ECM to the EBCM in the PCM or ECM scan tool data list. The displayed value should be 90 percent.

Circuit/System Testing

Ignition ON, with a DMM test for battery voltage of the delivered torque signal circuit between the EBCM and the PCM/ECM and ground.

If less than the specified range, test the delivered torque signal circuit for an open/high resistance, and short to ground. If the circuit tests normal, replace the EBCM.
If greater than the specified range, test the delivered torque signal circuit for a short to voltage. If the circuit tests normal, replace the PCM/ECM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM, PCM or ECM replacement, setup, and programming