Diagnostics of ABS system malfunctions (Chevrolet Captiva 1)

Diagnostic Trouble Codes

DTC	Description
C0035	Front Left Wheel Speed Sensor Circuit
C0040	Front Right Wheel Speed Sensor Circuit
C0045	Rear Left Wheel Speed Sensor Circuit
C0050	Rear Right Wheel Speed Sensor Circuit
C0110	electric fuel pump circuit
C0131	Anti-lock braking system (ABS) / traction control system (TCS) operating circuit
C0161	Anti-lock Brake System (ABS)/Traction Control System (TCS) Brake Switch/Sensor Circuit
C0186	Lateral acceleration accelerometer circuit
C0196	Yaw rate sensor circuit
C0252	Vehicle Stability Enhancement System (VSES) Sensors are uncorrelated
C0280	The stability enhancement system is running for too long
C0287	Longitudinal acceleration accelerometer circuit
C0292	VSES Instrument Cluster Sensor Circuits
C0460	Steering wheel position sensor
C0550	Controller (ECU) performance
C0551	Option configuration error
C0561	Saving information on system shutdown
C0569	System configuration error
C0899	Device {single or 1} Low Voltage
C0900	Device {single or 1} High Voltage
U0102	Lost connection with RDM (Transfer case module)
U1500	Communication fault on CAN bus 2 (sensor group) (The bus is disconnected)
U2100	CAN bus communication fault (The bus is disconnected)
U2105	Lost connection with ECM
U2106	Lost connection with gearbox controller
U2107	Lost connection with BCM
U2139	Connection to the gateway unit has been lost
U2142	Lost connection with sensor group
U2143	Lost connection with steering wheel angle sensor

Checking the diagnostic circuit

Description of the system

The diagnostic circuit test is a systematic method for finding the cause of malfunctions in the ABS/DDRP system.

A service technician troubleshooting any ABS/DDRP system malfunction should begin by checking the diagnostic circuits. The diagnostic circuits are organized in a logical sequence that the technician should follow when troubleshooting the cause of the malfunction.

For serial transmission/reception of data from the EBCM brake controller, contacts 11 and 14 are used. The constant supply voltage from the battery is supplied to the EBCM via contacts 1 and 32, and the voltage when the ignition is turned on is supplied to contact 4. The EBCM is connected to ground via contact 16.

Diagnostic procedure

When servicing the ABS/DDRP system, follow the steps below.

1. Check the condition of the mechanical elements of the vehicle structure related to the braking system.

• The brake fluid level in the reservoir is normal.
• Check visually whether the fluid in the master cylinder is contaminated
• Check the master cylinder and modulator for leaks.
• Check the master cylinder and modulator for leaks.
• Check the brake components on all wheels.
• Make sure that the brakes do not grab (adjusting the brake warning light switch).
• Check the equality of braking force on all wheels (no lateral drift)
• Check the brake pads for wear and damage.
• Check wheel bearings for wear and damage.
• Check the wheel speed sensors and their wires.
• Check the speed sensor toothed rings for damage.
• Check the tire for wear and determine the tread thickness.
• To verify that there is a malfunction, perform a test drive.

2. Perform a diagnostic circuit check and proceed to the appropriate troubleshooting table.

3. After all faults in the ABS system have been eliminated, the messages with the system fault codes should be erased.

Checking the diagnostic circuit

Step	Operation	Values	Yes	No
1	Connect or install all previously disconnected or removed elements. The ignition switch is in the "ON" position. Connect the appropriate scan tool to the DLC connector and attempt to communicate with the EBCM. Does the scan tool communicate with the EBCM?	-	Jump to operations 2	Jump to operations 4
2	Are there any diagnostic trouble codes, current or historical?	-	Jump to operations 3	Jump to operations 7
3	Record current fault codes. Record archived fault codes. Record additional archive data such as number of entries for each diagnostic code number of entries for each diagnostic code after the first entry number of entries for each diagnostic code speed at the time of each diagnostic code entry other additional data that may assist in diagnosis. Do not clear diagnostic trouble codes until all information displayed on the scan tool has been read and written. See the appropriate diagnostic trouble code. See. "Diagnostic Trouble Codes and Their Descriptions" in this section.	-	-	-
4	Check the DLC connector wiring harness, battery and cable. Are all positions ok?	-	Jump to operations 5	Jump to operations 6
5	Replace the electronic brake control module (EBCM) with a new one. Test the new Electronic Brake Control Module (EBCM) with a scan tool. Are any DTCs found?	-	Jump to operations 1	The system is normal
6	Repair the fault in the DLC connector wiring harness or battery cable. If necessary, replace the faulty DLC connector wiring harness, battery cable, or battery itself. Check the Electronic Brake Control Module (EBCM) with a scan tool. Are any DTCs found?	-	Jump to operations 1	The system is normal
7	The ignition switch is in the "OFF" position. Wait 10 seconds. The ignition switch is in the "ON" position. Watch for the yellow ABS indicator light when turning the key. Did the ABS warning light and brake warning light come on for 3 seconds? (checking lamps)?	-	Jump to operations 8	Jump to operations 9
8	The system is functioning normally.	-	The system is normal	-
9	Did the lamp continue to burn?	-	Jump to operations 10	The system is normal
10	Refer to the appropriate table for DTC troubleshooting instructions.	-	-	-

Diagnostic test drive

When servicing vehicles, the Anti-lock Braking System (ABS) and Traction Control System (TCS) require test drives to perform all tests and run all system functions. A test drive may also be required to reset individual trouble codes described in this section. Diagnostic System Check (including test drive) should be carried out after completion of vehicle repairs in order to check the effectiveness of the repair work performed.

The diagnostic test drive mode depends on the nature of the ABS/TCS problems.

1. Read the Diagnostic Instructions and Conditions for Setting the DTC.

2. Reconnect all previously disconnected components.

3. Start the engine.

4. Drive the vehicle for at least 10 minutes, observing the following conditions. No illegal or unsafe maneuvers are allowed while driving.

• Driving on the motorway
• Uneven roads
• Review customer complaints and re-create required driving conditions.
• Without disconnecting the engine, connect the scanning device and check for any DTCs. If any DTCs are installed, follow the instructions for removing these diagnostic trouble codes from the corresponding table.

Initialization sequence

The Electronic Brake Module (ECBM) performs an initialization routine at the beginning of each ignition cycle until the vehicle speed reaches 15 km/h (9 miles/hour). The initialization program sets the sequence of operation of each solenoid valve and pump motor, as well as the necessary relays, in order to check the operation of the components. If any DTC is detected, the Brake System Controller (EBCM) will set a specific fault code. The initialization sequence can be felt and heard, and this is a common part of the job.