Hummer H3. Manual — part 633

Repair Procedures

Front Wheel Hub, Bearing and Seal Replacement

Control Module References for EBCM and BPMV replacement, setup and programming

DTC C0110

DTC Descriptor

DTC C0110

Pump Motor Circuit

Diagnostic Fault Information

Circuit/System Description

The ABS pump motor recharges the brake fluid accumulator during antilock braking and normal
power brake assist. The ABS pump motor is part of the hydraulic brake booster assembly.

Conditions for Running the DTC

Ignition voltage is greater than 9.5 volts.

Conditions for Setting the DTC

The ABS pump runs continuously for 178 seconds.

The EBCM detects an open in the pump motor circuit when the pump motor is activated.

Action Taken When the DTC Sets

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

ABS indicator turns ON.

Brake warning indicator turns ON.

Driver information center (DIC) displays the SERVICE ABS/TRACTION System message.

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

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

using this diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

DIC displays the SERVICE STAB SYS message.

An ECE 13 response may occur.

ABS pump motor runs intermittently, 2 seconds on and 8 seconds off.

Conditions for Clearing the DTC

The condition for setting 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.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System 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 Verification

With the scan tool, access the ABS special functions menu and perform the ABS Motor test. The
pump motor should function and no DTCs should be set.

Circuit/System Testing

1. With the ignition OFF, disconnect the main EBCM harness connector (C2) an the small 4-

way EBCM harness connector (C1). At both EBCM harness connectors, test for 12 volts on
the battery positive voltage circuits.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

If the voltage is below 10 volts, repair open or short to ground on the battery positive
voltage circuit.

2. Connect one end of a test lamp to battery positive voltage. At the EBCM connector, touch

the other end of the test lamp to each of the three ground circuits. The test lamp should
illuminate.

If the test lamp does not illuminate when touched to each ground circuit, repair open in
the suspected ground circuit.

3. Remove the two small rubber caps that cover the ABS pump motor connections to the

EBCM. Connect a test lamp between the two terminals located under the rubber plugs. Turn
the ignition ON. Use the scan tool to command the ABS pump motor ON.

If the test lamp illuminates, replace the hydraulic brake booster.

If the test lamp does not illuminate, replace the EBCM/BPMV assembly.

Repair Procedures

Control Module References for EBCM replacement, setup and programming

Power Brake Booster Replacement

DTC C0131

DTC Descriptor

DTC C0131

Antilock Brake System (ABS) Pressure Circuit

Diagnostic Fault Information

Circuit/System Description

The ABS pump motor and accumulator operates the ABS and base brake power assist systems.
Pressurized brake fluid is stored in the accumulator and used for ABS and base brake power
assist functions. An accumulator pressure sensor located internally in the electronic brake control

IMPORTANT: Always perform the Diagnostic Repair Verification after

completing the diagnostic procedure.

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

using this diagnostic procedure.

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3

module (EBCM) monitors the accumulator pressure. If accumulator pressure becomes too low,
the ABS pump motor is commanded ON.

Conditions for Running the DTC

The ignition is ON

Conditions for Setting the DTC

The accumulator internal power supply is out of range.

The accumulator pressure sensor value changes more than 15 MPa in 0.08 seconds.

The accumulator pressure signal fails to change at least 0.12 MPa during the accumulator
pressure test.

The EBCM detects that the accumulator pressure signal is too low when the vehicle is
driven.

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.

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

The accumulator pressure sensor is located internally in the BPMV and is not serviceable.

Reference Information

Schematic Reference

Antilock Brake System Schematics

2007 Hummer H3

2007 BRAKES Antilock Brake System - H3