Chevrolet Captiva Service & Repair Manual: Antilock Brake System Diagnosis & Testing
| 1. |
Verify that following areas function
as designed: |
| |
a. |
Battery is fully charged and cables
are clean and tight. |
| |
c. |
Ground circuits for area of customer
concern are clean, tight, and in correct location. |
| |
d. |
All connections/connectors for area
of concern are fully seated. |
| |
e. |
There are no aftermarket devices that
affect operation of system. |
| |
f. |
A suitably programmed scan tool powers
up. |
| 2. |
Understand and validate customer concern.
Inspect visible system components for obvious damage or conditions
that may cause concern. |
| 3. |
Verify symptom is not exclusively a
mechanical concern. If symptom is exclusively a mechanical concern,
diagnose and repair as required. |
| 4. |
Verify vehicle powers up with ignition
"ON". If vehicle does not power up, diagnose and repair as required. |
| 5. |
Perform vehicle DTC Information function
using a suitably programmed scan tool. Verify at least one control
module communicates with scan tool. Record any control module that
is not communicating, any DTC, including symptom byte, and control
module that has set DTC. |
| 6. |
Verify there are no current control
module Internal Hardware Performance DTCs set. If any DTC of this
type is set, diagnose and repair as required. |
| 7. |
Verify vehicle is built with any control
module listed as not communicating. |
| 8. |
Verify there are no current control
module Power Mode or Communication DTCs set If any DTC of this type
is set, diagnose and repair as required. |
| 9. |
With driver door open, observe scan
tool Power Mode parameter while cycling ignition switch through
all power modes. Verify current Power Mode parameter matches actual
ignition switch positions. |
| 10. |
Verify that engine cranks and runs. |
| 11. |
Verify there are no other DTCs set.
If other DTCs are set, diagnose them in order as follows: |
| |
b. |
Programming, Setup, Configuration or
Software Performance DTCs. |
| |
c. |
Component related DTCs. |
| 12. |
Verify customer concern is not related
to inspection/maintenance testing if inspection and maintenance
testing has been performed. |
| 13. |
Diagnose any remaining customer concern. |
|
Chevrolet Captiva's Antilock Brake System (ABS) is essential for maintaining control during braking, especially on slippery surfaces. Proper diagnosis and testing of the ABS ensure it functions correctly and enhances vehicle safety.
To diagnose the ABS, start by checking the ABS warning light on the dashboard. If it stays illuminated, there is a system issue. Use an OBD-II scanner compatible with ABS to retrieve error codes from the vehicle's diagnostic port. These codes help identify specific problems within the ABS system.
Common issues include faulty wheel speed sensors, damaged wiring, or a malfunctioning ABS module. Inspect each wheel speed sensor for damage or dirt buildup and clean or replace them as necessary. Check the wiring harness for signs of wear, corrosion, or disconnection.
Test the ABS by driving at a low speed in a safe area and applying the brakes firmly. You should feel pulsations in the brake pedal, indicating the ABS is working. If the ABS does not activate or if the brakes lock up, further investigation is needed.
Ensure the brake fluid level is adequate and inspect brake pads and rotors for wear. After repairs, clear error codes with the OBD-II scanner and test drive the vehicle to confirm the ABS warning light stays off and the system functions properly.
Caution: Always connect or disconnect the wiring harness connector from the EBCM/EBTCM with the ignition switch in the OFF position. Failure to observe this precaut ...
Brakes
ABS Control Module R&R