Do you have a ABS light on? What about the traction control light? You will need a scanner to diagnose the problem especially if the lights are on,
When checking potential ABS/TCS faults, check following before performing diagnostic trouble code testing:
Check brake master cylinder fluid reservoir for proper brake fluid level and possible contamination.
Check brake modulator for leaks or wiring damage.
Check brake components at all wheels for brake drag and proper brake operation.
Check wheel bearings for wear or damage causing wheels to wobble.
Check all ABS/TCS wiring harness connectors for proper engagement, loose wires or terminals and/or corrosion. Check harness routing; pay particular attention to wheel speed sensor wiring harness routing.
Check for proper outer CV joint alignment and operation.
Check for proper tire wear (tread depth).
Always perform diagnostic system check before diagnosing DTCs. See DIAGNOSTIC SYSTEM CHECK.
Using scan tool, display all current and history codes. Codes are stored in order of occurrence. Note which codes are current and which codes are history. Review code history. Review trouble codes stored and frequency of failure. Review enhanced diagnostics information in scan tool operation manual. DO NOT clear codes until ABS/TCS repairs are complete. After reviewing enhanced diagnostics information, perform DIAGNOSTIC SYSTEM CHECK. See DIAGNOSTIC TROUBLE CODE (DTC) table as necessary.
If no diagnostic trouble codes are present and no mechanical component malfunctions are present, or if failure is intermittent and not reproducible, test drive vehicle using snapshot feature of scan tool. Drive vehicle in a normal manner, with normal acceleration, stopping and turning.
If vehicle test drive does not reproduce any failures, perform another test drive with an ABS stop from about 30-50 MPH on surface such as gravel. Trigger snapshot feature of scan tool to determine if any faults were present.
If trouble codes were set, perform DIAGNOSTIC SYSTEM CHECK. See DIAGNOSTIC TROUBLE CODE (DTC) table. DO NOT clear codes until ABS/TCS repairs are complete. If no trouble codes were set and ABS warning indicator and/or BRAKE warning indicator illuminates, see SYMPTOM DIAGNOSIS.
Wednesday, December 8th, 2010 AT 5:55 AM