P1689

DTC C0244 or P1689

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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 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 (Component Tests and General Diagnostics).
* 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 ([1][2]Antilock Brakes / Traction Control Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) 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 (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for EBCM, PCM or ECM replacement, setup, and programming