Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Chevrolet Optra5 Base, StandardFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake System
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Antilock Brake System
- Diagnostic System Check - ABS
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC C0035
- DTC C0040
- DTC C0045
- DTC C0050
- DTC C0060/C0065
- DTC C0070/C0075
- DTC C0080/C0085
- DTC C0090/C0095
- DTC C0110
- DTC C0121
- DTC C0141-C0156
- DTC C0161
- DTC C0245
- DTC C0550
- DTC C0800
- DTC C0931
- Symptoms - Antilock Brake System
- No Communication with Electronic Brake Control Module
- ABS Indicator Always On
- ABS Indicator Inoperative
- Traction Off Indicator Always On
- Traction Off Indicator Inoperative
- Repair Instructions
- Description and Operation
- ABS Description and Operation
- Basic Knowledge Required
- Antilock Brake System (ABS) Components
- Base Braking Mode
- Antilock Braking Mode-Apply
- Antilock Braking Mode-Hold
- Antilock Braking Mode-Release
- Electronic Brake Force Distribution (EBD) System
- The Benefits of Electronic Brake Force Distribution (EBD)
- Electronic Brake-Force Distribution (EBD) Failure Matrix
- Tires and ABS/EBD
- Front Wheel Speed Sensor
- Front Wheel Speed Sensor Rings
- Rear Wheel Speed Sensor and Rings
- Value Relay and Pump Motor Relay
- Wiring Harness
- Indicators
- Computer System Service Precautions
- General Service Precautions
- ABS Description and Operation
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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