Antilock Brake System Chevrolet Corvette C6

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Begin the system diagnosis with Diagnostic System Check - Vehicle . The diagnostic system check - vehicle will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the diagnostic system check - vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The wheel speed sensor (WSS) receives ignition voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.

C0035 00-C0050 00

1. Ignition ON.
2. Ignition voltage is greater than 9.5 volts.

C0035 5A-C0050 5A

1. Ignition ON.
2. Ignition voltage is greater than 9.5 volts.
3. The brake pedal is not pressed.
4. A DTC is not set for the other wheel speed sensor on the same axle.

1. A short to ground, or an open/high resistance is detected on the wheel speed sensor ignition voltage circuit.
2. A short to voltage, short to ground or an open/high resistance is detected on the signal circuit.
3. Wheel speed sensor power supply is less than 7.6 volts.
4. A missing wheel speed sensor signal

An erratic signal output of the wheel speed sensor is detected.

Actions Taken when the DTC Sets

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.
3. The EBCM disables the voltage to the wheel speed sensor the fault is detected on.

Conditions for Clearing the DTC

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

Diagnostic Aids

If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.

If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure

1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water).
2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds.
3. Rinse the area thoroughly when completed.

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

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 volt between the ignition voltage circuit terminal of the appropriate sensor listed below and ground. LF Sensor circuit terminal 21 RF Sensor circuit terminal 18 LR Sensor circuit terminal 33 RR Sensor circuit terminal 19 If greater than the specified range, test the ignition voltage circuit for a short to voltage.
3. Test for less than 1 volt between the signal circuit terminal of the appropriate sensor listed below and ground. LF Sensor circuit terminal 34 RF Sensor circuit terminal 6 LR Sensor circuit terminal 20 RR Sensor circuit terminal 31 If greater than the specified range, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the ignition voltage terminal of the appropriate sensor circuit listed below and ground. LF Sensor circuit terminal 21 RF Sensor circuit terminal 18 LR Sensor circuit terminal 33 RR Sensor circuit terminal 19 If less than the specified value, test the ignition voltage circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground. LF Sensor circuit terminal 34 RF Sensor circuit terminal 6 LR Sensor circuit terminal 20 RR Sensor circuit terminal 31 If less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate WSS.
7. Test for less than 2 ohms between the appropriate ignition voltage circuit terminals listed below. LF Sensor circuit terminal 21 at the EBCM harness connector, and terminal B at the WSS harness connector RF Sensor circuit terminal 18 at the EBCM harness connector, and terminal B at the WSS harness connector LR Sensor circuit terminal 33 at the EBCM harness connector, and terminal B at the WSS harness connector RR Sensor circuit terminal 19 at the EBCM harness connector, and terminal B at the WSS harness connector If greater than the specified range, test the ignition voltage circuit for an open or high resistance.
8. Test for less than 2 ohms between the appropriate signal circuit terminals listed below. LF Sensor circuit terminal 34 at the EBCM harness connector, and terminal A at the WSS harness connector RF Sensor circuit terminal 6 at the EBCM harness connector, and terminal A at the WSS harness connector LR Sensor circuit terminal 20 at the EBCM harness connector, and terminal A at the WSS harness connector RR Sensor circuit terminal 31 at the EBCM harness connector, and terminal A at the WSS harness connector If greater than the specified range, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Front Wheel Bearing and Hub Replacement»(/chevrolet/corvette/c6-2004-2014/remont/suspension-front/#front-suspension-system)
2. «Rear Wheel Bearing and Hub Replacement»(/chevrolet/corvette/c6-2004-2014/remont/suspension-rear/#rear-suspension-system)
3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pump motor is an integral part of the brake pressure modulator valve (BPMV), while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When the antilock brake system (ABS) or traction control system (TCS) operation is required the EBCM activates the pump motor relay and turns the pump motor ON.

Conditions for Running the DTC

1. Ignition is ON.
2. Initialization is complete.

Conditions for Setting the DTC

1. The EBCM detects a short to ground or an open/high resistance on the B+ circuit.
2. The EBCM detects an open/high resistance on the ground circuit.
3. The EBCM detects the pump motor runs continuously.
4. The EBCM detects the pump motor is binding or stalled.

Action Taken When the DTC Sets

1. The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

1. The condition for the DTC is no longer present and the ECE 13 response is completed by driving the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM will turn off the ABS indicator.
2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit Verification

Ignition ON, perform the Pump Motor Test with a scan tool and listen/feel the Pump Motor turn ON and OFF.

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 1 ohm between the ground circuits listed below and ground. Terminal 38 Terminal 13 If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground. Terminal 25 Terminal 1 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the BPMV.
4. If all circuits test normal, replace the BPMV/EBCM assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system)
2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) uses input from the brake pressure sensor for vehicle stability enhancement system (VSES) functions. The brake pressure sensor is internal to the brake pressure modulator valve (BPMV).

1. Ignition ON.
2. Ignition voltage is greater than 10 volts.

1. Sensor supply voltage is less than 4.5 volts or greater than 5.3 volts for more than 1 sec.
2. Sensor signal voltage is less than 0.12 volts or greater than 3.2 volts for more than 1 sec.

1. The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

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

A C0131 can get set if the ECU is loosely attached to the hydraulic unit. The mountings should be checked for the proper torque.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, perform the Brake Pressure Sensor Calibration using Tech 2. Cycle ignition and verify that DTC C0131 is set
2. Verify that DTC C0277 or C0278 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
3. Ignition ON, observe the scan tool EBCM BPP signal parameter while applying and releasing the brake pedal. The reading should change between Applied and Released. If the parameter does not change between applied and released, replace the BPMV/EBCM assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system)
2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) detects inputs from the brake pressure sensor, vehicle speed, and a serial data message from the BCM that the brake pedal is applied. When the vehicle is stopping the EBCM monitors for the brake pedal is pressed, with the brake pressure increasing and the vehicle is slowing down, or when the vehicle is accelerating, the brake pedal is not pressed and brake pressure is not increasing.

1. The vehicle speed is greater than 16 km/h (10 mph).
2. The ignition voltage is greater than 9.5 volts.

1. The EBCM detects the vehicle speed greater than 21 km/h (13 mph), the brake pedal is Applied for 1 minute, and brake pressure is not increasing.
2. The EBCM detects brake pedal is Released and the vehicle speed is decreasing with the brake pressure is increasing.

1. The EBCM disables the antilock brake system (ABS), traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

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

The DTC C0161 00 can be set if the brake pedal is applied while accelerating.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC C0277, or C0278 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
2. Brake pedal unapplied, verify that the brake lamps are not illuminated If brake lamps are illuminated, refer to «SYMPTOMS - LIGHTING»(/chevrolet/corvette/c6-2004-2014/remont/exterior-lights/#lighting-systems__symptoms-lighting) .
3. Replace the EBCM/BPMV assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system)
2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) monitors how often the traction control system (TCS) activates in order to calculate an estimate of the EBCM solenoid valve temperatures. In most cases high solenoid valve temperatures are caused by extended TCS activation. If the EBCM calculates that the solenoid valve temperatures are too high, the EBCM will temporarily suspend the TCS function until the solenoid valves cool.

1. The ignition is ON.
2. Ignition voltage is greater than 8 volts.

The estimated solenoid coil temperature reaches 220°C (428°F).

1. The EBCM disables the TCS for the duration of the ignition cycle.
2. A DIC message and/or a warning message may be displayed

1. After the solenoid valves have cooled the EBCM automatically re-enables TCS function.
2. The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Most occurrences of this DTC are caused by excessive TCS activation or braking.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References Scan Tool Information

1. With scan tool clear the DTC.
2. Refer to «Diagnostic Aids»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system) .
3. With scan tool connected test drive the vehicle under normal braking conditions and without causing TCS or ABS activation. Verify DTC C0179 does not reset. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The yaw rate and the lateral accelerometer sensors are combined into one sensor, external to the electronic brake control module (EBCM). The vehicle stability enhancement system (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The yaw rate/lat sensor communicates with the EBCM via discrete CAN Bus High and CAN Bus Low serial data circuits.

The engine is running.

1. Short to ground on the CAN High serial data circuit.
2. The yaw/lateral combination sensor fails an internal self test.
3. Communication is lost between the EBCM and the yaw/lateral combination sensor.
4. The correlation error between the yaw/lateral combination sensor and steering angle sensor.

One or more of the following actions may occur

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning message may be displayed

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

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC C0710, U2100, or U2142 and not set. If C0710, U2100, or U2142 are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
2. Ignition OFF, disconnect the harness connector at the yaw rate/lat sensor.
3. Ignition OFF for 60 seconds, test for less than 5 ohms between the low reference circuit terminal 1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance.
4. Ignition ON, test for B+ between the ignition voltage circuit terminal 4 and ground. If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance.
5. If all circuits test normal, replace the yaw rate/lat sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The EBCM controls it's internal valve relay to command the valve solenoids ON or OFF.

1. Ignition voltage is greater than 10 volts.
2. The solenoid relay is commanded ON.

1. The EBCM detects no change when commanding the valve relay ON or OFF.
2. The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS).
2. A DIC message and/or a warning indicator may be displayed.

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

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be battery voltage.

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 2 ohm of resistance between the ground terminals 38 and 12 to ground. If greater than the specified range, test the ground circuits for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ terminals 25 and 13 and ground. If the test lamp does not illuminate, test the B+ circuits for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) and the engine control module (ECM) simultaneously control the traction control. The EBCM sends a high speed GMLAN serial data message to the ECM requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.

1. The ignition is ON.
2. Ignition voltage is greater than 8 volts.

The ECM 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 ECM will typically set other DTCs and the EBCM will set DTC C0242.

1. The EBCM disables the traction control system (TCS) for the duration of the ignition cycle.
2. A DIC message and/or a warning message may be displayed.
3. The antilock brake system (ABS) remains functional.

1. The condition for the DTC is no longer present.
2. The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
2. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)

Scan Tool Reference

Control Module References

1. Verify that no DTCs are set in the ECM. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal, and uses the frequency of the square wave signal to calculate the wheel speed.

1. Ignition voltage is greater than 10 volts.
2. No wheel speed sensor faults exist.
3. Brake is not applied.
4. Vehicle is not cornering.

Wheel speed differences between one wheel and the others is greater than 5 percent.

1. The EBCM disables the traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

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

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Inspect for one tire that has improper air pressure or improper size.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) controls the vehicle stability enhancement system (VSES) by monitoring the inputs of the yaw rate/lateral accelerometer sensor, and steering wheel angle sensor. The readings are compared to an internal calibrated value so it knows if the vehicle is having an instability condition to activate the VSES. When the readings indicate a VSES event is occurring longer than 10 seconds is not possible under normal conditions. The yaw/lateral sensor is a combination sensor in one component.

1. The steering angle has been centered.
2. VSES is active.

One of the following conditions exist

1. VSES is engaged for 10 seconds with the yaw rate error always in either understeer or oversteer.
2. The yaw rate error is greater then 10 degrees/second for 5 seconds, and the yaw has not changed and the lateral acceleration is less than 0.5 g.

One or more of the following actions may occur

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning message may be displayed

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

The following conditions can cause this concern

1. Improper steering alignment or tire pull
2. An improperly mounted or loose combination yaw rate/lateral accelerometer sensor
3. An internal yaw rate/lateral accelerometer failure

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC C0186, C0196, C0253, or C0710 is not set.

1. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) receives serial data messages from the steering wheel position sensor identifying the position and direction of the steering wheel rotation.

Ignition ON.

The calculated steering angle from the steering wheel position sensor does not correlate with the steering angle calculated from the yaw rate.

One or more of the following actions may occur

1. The EBCM disables the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning message may be displayed

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

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC C0186, C0196, C0252, or C0710 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list)
2. With the scan tool perform the Steering Angle Sensor Centering.
3. Operate the vehicle within the conditions for setting, and verify the DTC does not reset. If the DTC sets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) monitors the brake pad wear indicators. When the electronic brake control module (EBCM) detects the brake pad to be worn down to an unacceptable level a warning message will be displayed on the DIC warning the owner to service the brake pad and rotors

The engine is running.

Worn brake pads, or a short to ground on the sensor return circuit.

A DIC message and/or a warning message may be displayed

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

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify brake wear sensors are not contacting rotor surface. If wear indicator has made rotor contact, service brake pads on the affected axle.
2. Verify that DTC C0288 02 is not set. If DTC C0288 02 is set, test and repair brake wear sensor signal circuit for a short to ground condition.
3. If DTC C0288 still sets, measure for open between PIN 30 and 23 at EBCM connector side. If sensors and circuits test OK and DTC is still set replace EBCM.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) detects an internal malfunction.

The ignition switch is in the ON position.

An internal EBCM malfunction exists.

One or more of the following actions may occur

1. The EBCM disables the antilock brake system (ABS).
2. The EBCM disables or degrades the dynamic rear proportioning (DRP) function.
3. A DIC message and/or a warning message may be displayed

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

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Verify DTC C0550 is not a current DTC.

1. If DTC C0550 is current, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) receives serial data messages from the body control module (BCM), engine control module (ECM), instrument panel cluster (IPC), and the transmission control module (TCM) which are needed to perform antilock brake system (ABS), vehicle stability enhancement system (VSES), or traction control system (TCS) functions.

Ignition voltage is greater than 10 volts.

The EBCM receives an invalid serial data message from another module.

1. The EBCM disables the traction control system (TCS)/vehicle stability enhancement system (VSES).
2. A DIC message and/or a warning indicator may be displayed.

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

This DTC indicates that there are no problems in the EBCM. The BCM, ECM, IPC and the TCM should be checked for a possible fault.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. With a scan tool, view the Invalid Signal Data Display.
2. If no invalid signal are present, view Signal Fault Data in the Enhanced DTC Data.
3. Refer to appropriate module for diagnosing the invalid message data.
4. Do not replace the EBCM due to this DTC fault.

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake module (EBCM) receives a serial data message from each of the network modules. Each module contains its own unique identification (ID) code that must be programmed into a new the EBCM.

Ignition ON.

The EBCM has not undergone the programming procedure.

1. The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning message may be displayed.

A current DTC will clear when the EBCM is programmed.

A newly replaced EBCM will set DTC C0569 on its initial ignition ON cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that C0569 is not set.

1. If the DTC is set, program the EBCM. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) receives CAN message inputs from the steering wheel position sensor identifying the position and direction of the steering wheel rotation.

The engine is running.

C0710 00

1. Open or short to ground on the ignition voltage circuit
2. Open, short to ground, or short to voltage on the low reference circuit

C0710 5A

1. The calculated steering angle does not correlate between the steering angle sensor and the yaw rate sensor.
2. The steering wheel is off-center.

1. The EBCM disables the VSES for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
3. Run vehicle faster than 9.3mph xxx to clear DTC

The car should not pull in either direction causing the steering wheel to be off-center while driving straight on a level surface.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. With the scan tool perform the Steering Angle Sensor Centering.
2. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not reset.

1. Verify that DTC U2100, or U2142 are not set. If the DTC U2100, or U2142 are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list)
2. 2. Verify the Yaw rate sensor and steering angle sensor mounting position is correct.
3. Ignition OFF, disconnect the harness connector at the steering angle sensor.
4. Ignition OFF for 60 seconds, test for less than 5 ohms between the low reference circuit terminal 6 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance.
5. Ignition ON, test for ignition voltage between the ignition voltage circuit terminal 5 and ground. If not within the specified range, test the ignition voltage circuit for a short to ground or open/high resistance.
6. Ignition OFF, disconnect the harness connector at the EBCM.
7. Ignition ON, test for less than 1 volt between the following terminal listed below and ground. CAN Bus High serial data circuit terminal 37 CAN Bus Low serial data circuit terminal 24 If greater than the specified value, test the appropriate serial data circuit for a short to voltage.
8. Ignition OFF, test for infinite resistance between the following terminal listed below and ground. CAN Bus High serial data circuit terminal 37 CAN Bus Low serial data circuit terminal 24 If not the specified value, test the appropriate serial data circuit for a short to ground.
9. Test for less than 2 ohms between the appropriate serial data circuit terminals listed below. CAN Bus High serial data circuit terminal 37 at the EBCM harness connector and terminal 3 at the steering angle sensor harness connector. CAN Bus Low serial data circuit terminal 24 at the EBCM harness connector and terminal 1 at the steering angle sensor harness connector. If greater than the specified range, test the appropriate serial data circuit for an open/high resistance.
10. Test for infinite resistance between the CAN Bus High serial data circuit terminal 37 and the CAN Bus Low serial data circuit terminal 24. If not the specified value, repair the serial data circuits for a short together.
11. If all circuits test normal, test or replace the steering angle sensor. If DTC resets, replace the EBCM

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Wheel Position Sensor Replacement»(/chevrolet/corvette/c6-2004-2014/remont/steering-column-switches/#steering-wheel-and-steering-column)
2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit Description

The EBCM receives a serial data message from the tire pressure monitor (TPM) system when low tire pressure is detected. The EBCM will adjust the responses of vehicle stability enhancement system (VSES) to have optimal vehicle control when active.

The EBCM received a serial data message that low tire pressure is detected.

VSES is active.

A DIC message and/or a warning message may be displayed.

1. A current DTC will go to history after the VSES event is over.
2. A history DTC will clear after 100 consecutive malfunction-free ignition cycles.

1. This DTC is only current for the duration of the VSES event, and then it will go to history.
2. This DTC is not an indication of an ABS/VSES malfunction.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that the TPM system is functioning properly. Refer to Diagnostic Starting Point - Tire Pressure Monitoring .

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) , before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «ABS Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system__abs-description-and-operation) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the antilock brake system (ABS). Refer to «Checking Aftermarket Accessories»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. Inspect the master cylinder reservoir for the proper brake fluid level.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «ABS Indicator Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system)
2. «Traction Off Indicator Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system)

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument panel cluster (IPC) illuminates the antilock brake system (ABS) indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a high speed GMLAN serial data message to the body control module (BCM), to request the indicator to turn ON or OFF. The BCM sends the request to the IPC on the class 2 serial data bus.

Schematic Reference

1. «Antilock Brake System Schematics»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system)
2. «Data Communication Schematics»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#data-communication-system)
3. «Instrument Cluster Schematics»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)

Connector End View Reference

Component Connector End Views

Description and Operation

1. «ABS Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system__abs-description-and-operation)
2. «Indicator/Warning Message Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges__indicatorwarning-message-description-and-operation)

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for Scan Tool Information

Ignition ON. Observe the ABS indicator turn ON then OFF during the IPC bulb test.

1. Ignition ON. With a scan tool command the IPC display test ON and OFF. The ABS indicator should turn ON and OFF. If the ABS indicator does not turn ON and OFF when commanded, replace the IPC.
2. Replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Low Traction indicator is controlled by the instrument cluster via serial data messages from the electronic brake control module (EBCM). When the traction control system (TCS) is active for 0.5 seconds, the EBCM commands the instrument cluster to flash the Low Traction indicator.

The electronic brake control module (EBCM) sends a serial data message to the instrument panel cluster (IPC) to illuminate the Traction Control indicator when the EBCM has disabled the traction control system (TCS) due to a DTC. The Traction Control indicator will also turn ON during the instrument cluster bulb check. When the ignition switch is turned to ON, the Traction Control indicator will turn ON for approximately 3 seconds and then turn OFF.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for EBCM and IPC

1. Turn OFF the ignition for 5 seconds.
2. Turn ON the ignition, with a scan tool, select instrument panel special functions Display Test. Command the instrument panel lamps ON. Verify the traction control off lamp illuminates for at least 2 seconds and then turns off.

1. Ignition OFF for 5 seconds, Ignition ON, observe that the traction off indicator functions by illuminating for 2 seconds then turns OFF. If the traction OFF indicator does not illuminate, with the scan tool, select instrument panel special functions Display Test. Command the instrument panel lamps ON and OFF. Verify the TC lamp turns ON and OFF.

1. If the TC warning lamp does not turn OFF, replace the IPC.

1. If the TC warning lamp does turn OFF, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, setup, and programming

Repair Validation

Ignition OFF for 5 seconds, Ignition ON, observe that the traction control off indicator functions by illuminating for 2 seconds then turns OFF. This is the bulb self test that operates upon every ignition key start cycle.

Bleeding the ABS System

Perform a manual or pressure bleeding procedure. Refer to Hydraulic Brake System Bleeding (Pressure) or Hydraulic Brake System Bleeding (Manual) . If the desired brake pedal height results are not achieved, perform the automated bleed procedure below.

The procedure cycles the system valves and runs the pump in order to purge the air from the secondary circuits normally closed off during normal base brake operation and bleeding. The automated bleed procedure is recommended when air ingestion is suspected in the secondary circuits, or when the BPMV has been replaced.

Automated Bleed Procedure

1. Inspect the battery state of charge. Refer to «Battery Inspection/Test»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Remove the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/chevrolet/corvette/c6-2004-2014/remont/wheel-tire-system/#tires-and-wheels) .
4. Inspect the brake system for leaks and visual damage. Refer to «Brake Fluid Loss»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system__brake-fluid-loss) or «Symptoms - Hydraulic Brakes»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system__symptoms-hydraulic-brakes) . Repair or replace as needed.
5. Install a scan tool.
6. Turn ON the ignition, with the engine OFF.
7. With the scan tool, establish communications with the electronic brake control module (EBCM). Select Special Functions. Select Automated Bleed from the Special Functions menu.
8. Bleed the base brake system. Refer to «Hydraulic Brake System Bleeding (Pressure)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Manual)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system) .
9. Follow the scan tool directions until the desired brake pedal height is achieved.
10. If the bleed procedure is aborted, a malfunction exists. Perform the following steps before resuming the bleed procedure: If a DTC is detected, refer to «Diagnostic Starting Point - Antilock Brake System»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system) . If the brake pedal feels spongy, perform the conventional brake bleed procedure again. Refer to «Hydraulic Brake System Bleeding (Pressure)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Manual)»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system) .
11. When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.
12. Remove the scan tool.
13. Install the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/chevrolet/corvette/c6-2004-2014/remont/wheel-tire-system/#tires-and-wheels) .
14. Inspect the brake fluid level. Refer to «Master Cylinder Reservoir Filling»(/chevrolet/corvette/c6-2004-2014/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
15. Road test the vehicle while inspecting that the pedal remains high and firm.

Removal Procedure

1. Turn the ignition switch to the OFF position.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Negative Cable Disconnection and Connection (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
3. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
4. Clean the area surrounding the electronic brake control module (EBCM) and the brake pressure modulator valve (BPMV) of and dirt and debris.
5. Disconnect the EBCM electrical connector.
6. Remove the EBCM bolts (1).
7. Remove the EBCM (1) by carefully pulling straight away from the BPMV. Do not force the components apart.
8. Clean the sealing surfaces of the EBCM and the BPMV with denatured alcohol and allow to dry.

Installation Procedure

1. Install the EBCM (1) by carefully pressing straight onto the BPMV. Do not force the components together.
2. Install the EBCM bolts (1) and tighten in a cross pattern to 3 N.m (27 lb in).
3. Connect the EBCM electrical connector.
4. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Negative Cable Disconnection and Connection (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
5. If installing a new EBCM, program the EBCM. Refer to «Service Programming System (SPS)»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__service-programming-system-sps) .
6. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) .

1. Turn the ignition switch to the OFF position.
2. Disconnect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Negative Cable Disconnection and Connection (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
3. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (6.2L)»(/chevrolet/corvette/c6-2004-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-or-70l-introduction) or «Air Cleaner Assembly Replacement (7.0L)»(/chevrolet/corvette/c6-2004-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-or-70l-introduction) or «Air Cleaner Assembly Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-or-70l-introduction) .
4. Clean the area surrounding the electronic brake control module (EBCM) and the brake pressure modulator valve (BPMV) of and dirt and debris.
5. Disconnect the EBCM electrical connector.
6. Disconnect the left rear brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid leaks and contamination.
7. Disconnect the right rear brake pipe fitting (2). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid leaks and contamination.
8. Disconnect the right front brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid leaks and contamination. Do not force the components apart.
9. Disconnect the left front brake pipe fitting (2). Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid leaks and contamination.
10. Disconnect the master cylinder secondary brake pipe fitting (1). Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid leaks and contamination.
11. Disconnect the master cylinder primary brake pipe fitting (2). Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid leaks and contamination.
12. Remove the BPMV nuts (1).
13. Remove the EBCM/BPMV module assembly (1) from the bracket.
14. Remove the BPMV insulators (1). Inspect the insulators for damage and replace, if necessary.
15. Remove the EBCM bolts (1).
16. Carefully remove the EBCM (1) from the BPMV. Do not force the components apart.
17. Clean the sealing surfaces of the EBCM and the BPMV with denatured alcohol and allow to dry.

1. Carefully install the EBCM (1) to the BPMV. Do not force the components together.
2. Install the EBCM bolts (1) and tighten in a cross pattern to 3 N.m (27 lb in).
3. Install the BPMV insulators (1).
4. Install the EBCM/BPMV module assembly to the bracket.
5. Install the BPMV nuts (1) and tighten to 12 N.m (106 lb in).
6. Connect the master cylinder secondary brake pipe fitting (1) and tighten to 18 N.m (13 lb ft).
7. Connect the master cylinder primary brake pipe fitting (2) and tighten to 18 N.m (13 lb ft).
8. Connect the right front brake pipe fitting (1) and tighten to 18 N.m (13 lb ft).
9. Connect the left front brake pipe fitting (2) and tighten to 18 N.m (13 lb ft).
10. Connect the left rear brake pipe fitting (1) and tighten to 18 N.m (13 lb ft).
11. Connect the right rear brake pipe fitting (2) and tighten to 18 N.m (13 lb ft).
12. Connect the EBCM electrical connector.
13. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement (6.2L)»(/chevrolet/corvette/c6-2004-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-or-70l-introduction) or «Air Cleaner Assembly Replacement (7.0L)»(/chevrolet/corvette/c6-2004-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-or-70l-introduction) or «Air Cleaner Assembly Replacement (LS9)»(/chevrolet/corvette/c6-2004-2014/remont/testing-diagnostics/#engine-controls-and-fuel-62l-or-70l-introduction) .
14. Connect the negative battery cable. Refer to «Battery Negative Cable Disconnection and Connection (LS7 or LS9)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) or «Battery Negative Cable Disconnection and Connection (LS3)»(/chevrolet/corvette/c6-2004-2014/remont/charging-system/#battery-charging-system-starting-system) .
15. If installing a new EBCM, program the EBCM. Refer to «Service Programming System (SPS)»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__service-programming-system-sps) .
16. Perform the «Antilock Brake System Automated Bleed Procedure»(/chevrolet/corvette/c6-2004-2014/remont/anti-locktraction-control/#antilock-brake-system) .

1. Turn the ignition to the OFF position.
2. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/hoistjack/#general-information__lifting-and-jacking-the-vehicle) .
3. Remove the brake pressure modulator valve (BPMV) nuts (1).
4. Lift the BPMV assembly (1) upward to disengage the BPMV insulators from the brake pressure modulator valve bracket. Support the BPMV assembly with heavy mechanics wire or equivalent.
5. Remove the BPMV bracket bolts (1).
6. Remove the BPMV bracket (1).

1. Install the BPMV bracket (1).
2. Install the BPMV bracket bolts (1) and tighten to 27 N.m (20 lb ft).
3. Position the BPMV assembly (1) to the brake pressure modulator valve bracket.
4. Install the BPMV nuts (1) and tighten to 12 N.m (106 lb in).

Front Wheel Speed Sensor Replacement

The front wheel speed sensors are integral with the hub and bearing assemblies. If a speed sensor needs replacement, you must replace the entire hub and bearing assembly. Do not try to service the harness pigtail individually because the harness pigtail is part of the sensor. Refer to Front Wheel Bearing and Hub Replacement .

Rear Wheel Speed Sensor Replacement

The rear wheel speed sensors are integral with the hub and bearing assemblies. If a speed sensor needs replacement, you must replace the entire hub and bearing assembly. Do not try to service the harness pigtail individually because the harness pigtail is part of the sensor. Refer to Rear Wheel Bearing and Hub Replacement .

Scheme 4

1. Turn the ignition switch to the OFF position.
2. Remove the IP accessory trim plate. Refer to «Instrument Panel Accessory Trim Plate Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
3. Remove the HVAC Control Module. Refer to «HVAC Control Module Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#hvac-system-automatic) .
4. Disconnect the yaw rate sensor electrical connector.
5. Remove the two yaw rate sensor nuts (2).
6. Remove the yaw rate sensor (1).

1. Position the yaw rate sensor in the vehicle (1).
2. Install the yaw rate sensor bolts (2). Tighten: Tighten the bolts to 7 N.m (62 lb in).
3. Connect the yaw rate sensor electrical connector.
4. Install the HVAC Control Module. Refer to «HVAC Control Module Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#hvac-system-automatic) .
5. Install the IP accessory trim plate. Refer to «Instrument Panel Accessory Trim Plate Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
6. Turn the ignition switch to the ON position, engine off.
7. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) .

ABS Description and Operation

This vehicle is equipped with a Bosch ABS/EBD/TCS/VSES brake system. The electronic brake control module (EBCM) and the brake pressure modulator valve (BPMV) is serviced separately. The BPMV uses a 4 circuit configuration to control hydraulic pressure to each wheel independently.

The following vehicle performance enhancement systems are provided.

1. Antilock Brake System (ABS)
2. Bi-State Engine Mount (BSM)
3. Electronic Brake Distribution (EBD)
4. Traction Control System (TCS)
5. Variable Effort Steering (VES)
6. Vehicle Stability Enhancement System (VSES)

The following components are involved in the operation of the above systems.

1. ABS pump motor-The ABS pump motor is part of the brake pressure modulator valve. The ABS pump motor is active during ABS, VSES and base brake power assist functions. System relays-There are two system relays internal to the EBCM. The solenoid relay is energized when the ignition is ON. The ABS pump motor relay supplies a ground path to the ABS pump motor when the EBCM commands the ABS pump motor on. The system relays are non serviceable. Solenoids-The solenoids are commanded ON and OFF by the EBCM to operate the appropriate valves in the brake pressure modulator valve (BPMV).
2. Bi-State Engine Mounts solenoid commanded by the EBCM controls vacuum to engine mounts to dampen engine vibration at idle.
3. Brake booster vacuum sensor-The Brake Booster Vacuum Sensor is a input to EBCM, and operates the ABS pump motor to precharge the brake system.
4. Variable Effort Steering solenoid commanded by the EBCM to control steering effort based on speed of vehicle.
5. The BPMV contains the following components: ABS pump motor and pump Four inlet valves Four outlet valves Two TC isolation valves Two TC supply valves A master cylinder pressure sensor A front low-pressure accumulator A rear low-pressure accumulator
6. Lateral accelerometer-The EBCM uses the lateral accelerometer to determine the sideways acceleration of the vehicle. The lateral accelerometer is packaged with the yaw rate sensor as a single component.
7. Master cylinder pressure sensor-The master cylinder pressure sensor is located within the BPMV. The master cylinder pressure sensor uses a 5-volt reference and generates an output signal proportionate to the hydraulic fluid pressure which is present in the front brake circuit at the master cylinder.
8. Steering wheel position sensor--The EBCM receives CAN message inputs from the steering wheel position sensor.
9. Traction control switch-VSES and the engine torque reduction function of TCS are manually disabled or enabled by pressing the traction control switch.
10. Wheel speed sensors (WSS)-EBCM sends a 12-volt reference voltage signal to each wheel speed sensor. As the wheel spins, the wheel speed sensor produces a square wave DC signal voltage. The wheel speed sensor increases the signal frequency as the wheel speed increases, but does not increase the signal amplitude.
11. Yaw rate sensor-The EBCM uses the yaw rate sensor to determine the rate of rotation along the vehicle's vertical axis. The yaw rate sensor is packaged with the lateral accelerometer as a single component.
12. Brake wear sensors-The EBCM monitors the brake pad wear indicators. When the EBCM detects the brake pad to be worn down to an unacceptable level, a warning message will be displayed on the DIC, warning the owner to service the brake pad and rotors

When wheel slip is detected during a brake application, an ABS event occurs. During antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel. The ABS does not, however, increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.

During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are caused by the rapid changes in position of the individual solenoid valves as the electronic brake control module (EBCM) responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during antilock operation.

Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking is no different than that of previous non-ABS systems. Maintaining a constant force on the brake pedal provides the shortest stopping distance while maintaining vehicle stability. The typical ABS activation sequence is as follows.

Pressure Hold

The EBCM closes the isolation valve and keeps the dump valve closed in order to isolate the slipping wheel when wheel slip occurs. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.

Pressure Decrease

If a pressure hold does not correct the wheel slip condition, a pressure decrease occurs. The EBCM decreases the pressure to individual wheels during deceleration when wheel slip occurs. The isolation valve is closed and the dump valve is opened. The excess fluid is stored in the accumulator until the pump can return the fluid to the master cylinder or fluid reservoir.

Pressure Increase

After the wheel slip is corrected, a pressure increase occurs. The EBCM increases the pressure to individual wheels during deceleration in order to reduce the speed of the wheel. The isolation valve is opened and the dump valve is closed. The increased pressure is delivered from the master cylinder.

Electronic Brake Distribution (EBD)

The electronic brake distribution (EBD) is a control system that enhances the hydraulic proportioning function of the mechanical proportioning valve in the base brake system. The EBD control system is part of the operation software in the electronic brake control module (EBCM). The EBD uses active control with existing ABS in order to regulate the vehicle's rear brake pressure.

Brake Pressure Application

The EBCM uses brake pressure application to control traction by transferring torque through the driveline to wheels which are not slipping. The ABS pump motor, and appropriate valve solenoids are commanded ON and OFF to apply brake pressure to the slipping wheels. Brake pressure application is used in an attempt to maintain equal wheel speed sensor (WSS) signals at the driven wheels.

The EBCM does not allow excessive brake pressure application due to the fact that the solenoid coils or the brakes may become overheated, damaging the EBCM or reducing the drivers ability to stop the vehicle. Estimated coil and brake temperatures are determined by a calculation in the EBCM software. Overheated solenoid coils cause all brake pressure application to become disabled and the stability system disabled message to be displayed. Overheated brakes cause brake pressure application during TCS events to disable, yet the VSES remains functional and as long as the engine torque reduction is enabled, there is no indication to the driver when this occurs and no DTC sets.

Vehicle Stability Enhancement System (VSES)

Vehicle stability enhancement system (VSES) provides added stability during aggressive maneuvers. Yaw rate is the rate of rotation about the vehicle's vertical axis. The VSES is activated when the electronic brake control module (EBCM) determines that the desired yaw rate does not match the actual yaw rate as measured by the yaw rate sensor.

The desired yaw rate is calculated by the EBCM using, primarily, the following inputs.

1. The position of the steering wheel
2. The speed of the vehicle
3. The lateral, or sideways acceleration of the vehicle

The difference between the desired yaw rate and the actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. When a yaw rate error is detected, the EBCM attempts to correct the vehicle's yaw motion by applying brake pressure to one or more of the wheels. The amount of brake pressure which is applied varies, depending on the correction required. The engine torque may be reduced also, if it is necessary to slow the vehicle while maintaining stability.

VSES activations generally occur in turns during aggressive driving. When braking during VSES activation, the pedal may pulsate. The brake pedal pulsates at a higher frequency during VSES activation than during ABS activation.

Power-Up Self-Test

The electronic brake control module (EBCM) is able to detect many malfunctions whenever the ignition is ON. However, certain failures cannot be detected unless active diagnostic tests are performed on the components. Shorted solenoid coil or motor windings, for example, cannot be detected until the components are commanded ON by the EBCM. Therefore, a power-up self-test is required at the beginning of each ignition cycle to verify correct operation of components before the various control systems can be enabled. The EBCM performs the first phase of the power-up self-test when the ignition is first turned ON. The system relay, solenoids and the ABS pump motor are commanded ON and OFF to verify proper operation and the EBCM verifies the ability to return the system to base braking in the event of a failure. The master cylinder pressure sensor performs a self-test by sending a series of specific voltage signals to the EBCM, each for a predetermined amount of time. This phase of the power-up self-test may be heard by the driver, depending on how soon the engine is cranked and started after turning ON the ignition. The second phase of the power-up self-test begins when the vehicle is driven at a speed greater than 12 km/h (7.5 mph) and the EBCM has not detected any traction control module (TCS)/vehicle stability enhancement system (VSES) related malfunctions thus far. When the brake switch indicates that the brake is not applied and the master cylinder pressure is detected as being low, the EBCM proceeds with the test. The EBCM isolates all of the wheels by closing the 4 isolation valves. Due to the fact that all of the wheels are isolated during the second phase of the test, the test must be aborted if the brake is applied while the test is being performed. Occasionally, the driver may detect this by experiencing a momentary hard pedal.

VSES Sensors Initialization

The vehicle stability enhancement system (VSES) sensors values may vary slightly due to differences in temperature, sensor mounting, connector resistances, manufacturing, etc. Since VSES is a very sensitive and precise control system, it is imperative that the electronic brake control module (EBCM) be able to accurately equate a given sensor voltage with an actual unit of measurement. For example, the yaw rate signal of one vehicle may be 2.64 volts at +18.0 deg/sec yaw rate while the yaw rate signal of another vehicle may be 2.64 volts at +17.5 deg/sec yaw rate. Therefore, at the beginning of each ignition cycle, the EBCM must perform an initialization procedure to observe how the VSES sensors are correlated with each other and also to determine what each sensor value is when the applicable unit of measurement equals 0. This voltage is referred to as the sensor bias voltage. Although some activation of the VSES system may occur if required to prior to full initialization, the system does not give optimum performance until the sensors are fully initialized.

The following VSES sensors require initialization

1. The yaw rate sensor
2. The lateral accelerometer
3. The master cylinder pressure sensor
4. The steering wheel position sensor

When the vehicle speed is greater than 25 km/h (15 mph), full sensor initialization must occur during 3 km (1.8 mi) of driving or 1 km (0.6 mi) of straight and stable driving, whichever occurs first. Although an attempt at initialization may fail due to driving conditions, such as driving on a very winding road, failed initialization is usually caused by a sensor bias voltage which is not within an acceptable range. Often, a DTC sets soon after a failed initialization attempt. The message center displays the stability system disabled message when sensor initialization fails.

The steering angle sensor calibration. The Steering Angle Sensor is calibrated at the assembly plant. If the sensor is replaced, follow the calibration procedure.

ECE 13 Response

The electronic brake control module (EBCM) illuminates the ABS indicator when a malfunction which disables ABS is detected. Usually, the ABS indicator is turned OFF during the following ignition cycle unless the fault is detected during that ignition cycle. However, the setting of a wheel speed sensor related DTC causes the ABS indicator to remain illuminated during the following ignition cycle until the vehicle is operated at a speed greater than 13 km/h (8 mph). This allows the EBCM to verify that no malfunction exists, before turning OFF the ABS indicator. This reaction occurs even if the ABS indicator turns OFF when the scan tool is used to clear the DTCs. When repairing these vehicles, it is important to ensure that the ECE 13 response has occurred and that the ABS indicator does not illuminate after returning the vehicle to the customer. It is also important to verify that ECE 13 is not the cause of an ABS indicator which is illuminated when no DTCs are set, before attempting to diagnose other possible causes.

Driver Information Indicators and Messages

The following indicators are used to inform the driver of several different factors.

Brake Warning Indicator

The instrument panel cluster (IPC) illuminates the brake warning indicator when the following occurs.

1. The body control module (BCM) detects that the park brake is engaged. The IPC receives a serial data message from the BCM requesting illumination. The brake warning indicator flashes at a rate of approximately twice per second when the park brake is engaged.
2. The electronic brake control module (EBCM) detects a low brake fluid condition or a base brake pressure differential and sends a serial data message to the IPC requesting illumination.
3. The IPC performs the bulb check.
4. The EBCM detects an ABS-disabling malfunction which also disables electronic brake distribution (EBD) and sends a serial data message to the IPC requesting illumination.

ABS Indicator

The IPC illuminates the ABS indicator when the following occurs.

1. The EBCM detects an ABS-disabling malfunction and sends a serial data message to the IPC requesting illumination.
2. The IPC performs the bulb check.
3. The IPC detects a loss of serial data communication with the EBCM.
4. A DTC is set during the previous ignition cycle which requires an ECE 13 response at the beginning of the current ignition cycle. The EBCM sends a serial data message to the IPC requesting illumination.

Traction Control Off Indicator

The IPC illuminates the traction off indicator when the following occurs.

1. The EBCM disables engine torque reduction due to a malfunction and sends a serial data message to the IPC requesting illumination.
2. The driver manually disables VSES and engine torque reduction by pressing the traction control switch. The EBCM sends a serial data message to the IPC requesting illumination.

Stabilitrak Off Message

The message center displays the Stabilitrak off message when one or more of the following conditions exists.

1. The estimated temperature of any solenoid coil exceeds an acceptable limit. The EBCM sends a serial data message to the IPC requesting this display.
2. The EBCM detects a failed brake switch. The EBCM sends a serial data message to the IPC requesting this display. A DTC sets when this condition exists.
3. VSES sensor initialization time is excessive. The EBCM sends a serial data message to the IPC requesting this display.
4. Serial data communication between the EBCM and any of several other control modules is interrupted. The EBCM sends a serial data message to the IPC requesting this display or the IPC displays the message when communication with the EBCM is interrupted.
5. The PCM is not able to perform engine torque reduction. The EBCM sends a GMLAN message to the IPC requesting this display. DTCs set when this condition exists.
6. The EBCM detects an excessively low or excessively high ignition voltage. The EBCM sends a GMLAN message to the IPC requesting this display.

Service Stabilitrak Message

The message center displays the service stability system message when any one of many VSES-disabling DTCs is set. The EBCM sends a serial data message to the IPC requesting this display.

Service Traction Control Message

The message center displays the service traction control system message when any one of many traction control - disabling DTCs is set. The EBCM sends a serial data message to the IPC requesting this display.

Special Tools

Illustration Tool Number/Description J 35616 GM-Approved Terminal Test Kit J 39700 100-Pin Breakout Box J 39700-530

Scheme 5

Scheme 6

Scheme 7

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Front Wheel Bearing and Hub Replacement
• Rear Wheel Bearing and Hub Replacement
• Diagnostic Trouble Code (DTC) List - Vehicle
• SYMPTOMS - LIGHTING
• Steering Wheel Position Sensor Replacement
• Diagnostic Starting Point - Tire Pressure Monitoring
• Checking Aftermarket Accessories
• Data Communication Schematics
• Instrument Cluster Schematics
• Indicator/Warning Message Description and Operation
• Hydraulic Brake System Bleeding (Pressure)
• Battery Inspection/Test
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation
• Brake Fluid Loss
• Symptoms - Hydraulic Brakes
• Master Cylinder Reservoir Filling
• Fastener Caution
• Service Programming System (SPS)
• Air Cleaner Assembly Replacement (6.2L)
• Instrument Panel Accessory Trim Plate Replacement
• HVAC Control Module Replacement
• DTC C0035-C0050
• ABS Description and Operation