Hummer H3. Manual — part 639

DTC P1689

Traction Control Delivered Torque Output Circuit

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System Connector End Views

Powertrain Control Module Connector End Views

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

1. 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.

2. 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.

3. 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 volts.

If the voltage does not drop to below 0.5 volts, 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 Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

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

DTC C0245

DTC Descriptor

DTC C0245

Wheel Speed Sensor Frequency Error

Diagnostic Fault Information

Circuit/System Description

The wheel speed sensor receives a 12-volt reference voltage from the electronic brake control
module (EBCM). As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave
signal via the wheel speed sensor output circuit. The EBCM uses the frequency of the square
wave signal to calculate the wheel speed.

Conditions for Running the DTC

Ignition voltage is greater than 8 volts.

Vehicle must be moving at a speed greater than 30 km/h.

Conditions for Setting the DTC

The difference between 2 wheel speeds exceeds 20 percent.

The fault must be present for greater than 60 seconds.

Action Taken When the DTC Sets

The EBCM disables the Antilock Brake System (ABS)/Traction Control System
(TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle.

The ABS indicator turns ON.

The driver information center (DIC) displays the ABS FAULT message.

The Stability Caution indicator turns on.

The DIC displays the SERVICE STAB SYS message.

The DIC displays the TRACTION FAILED message.

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to

using this diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

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

Inspect tires for improper air pressure or improper size.

DTC C0268

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 Descriptor

DTC C0268

Class 2 Data Error Reported

Circuit/System Description

The electronic brake control module (EBCM) disables the traction control when other electronic
control modules set DTCs for components that affect the operation of the traction control system.

Conditions for Running the DTC

The ignition switch is in the ON position.

Conditions for Setting the DTC

The PCM or BCM diagnoses a condition preventing the engine control portion of the traction
control function and sends a serial data message to the EBCM indicating that torque reduction is
not allowed. The PCM or BCM will typically set a DTC and the EBCM will set this DTC.

Action Taken When the DTC Sets

One or more of the following actions may occur:

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3