Antilock Brake System for GMC Truck GMC P42 Commercial Chassis 1999

All Component Locator

• ABS Components
• Antilock Brake System Component Views

All Description and Operation

• Abbreviations and Definitions
• ABS Description
• ABS Operation
• Basic Knowledge Required
• General System Description
• Service Precautions

All Special Tools and Equipment

• Special Tools

All Visual Identification

• Antilock Brake System Connector End Views

Cleaning, Inspection, and Adjustment

• Antilock Brake System Automated Bleed Procedure

Diagnostic Procedures

• ABS Indicator Always On
• ABS Indicator Inoperative
• Diagnostic System Check - ABS

Diagnostic Trouble Codes

• DTC C0221 or C021 RF Wheel Speed Sensor Circuit Open
• DTC C0222 or C022 RF Wheel Speed Signal Missing
• DTC C0223 or C023 RF Wheel Speed Signal Erratic
• DTC C0225 or C025 LF Wheel Speed Sensor Circuit Open
• DTC C0226 or C026 LF Wheel Speed Signal Missing
• DTC C0227 or C027 LF Wheel Speed Signal Erratic
• DTC C0229 or C029 Drop Out of Front Wheel Speed Signals
• DTC C0235 or C035 Rear Wheel Speed Signal Circuit Open
• DTC C0236 or C036 Rear Wheel Speed Signal Circuit Missing
• DTC C0237 or C037 Rear Wheel Speed Signal Erratic
• DTC C0238 or C038 Wheel Speed Mismatch
• DTC C0241-C0254 or C041-C054 EBCM Control Valve Circuit
• DTC C0265 or C0266 and C065 C066 EBCM Relay Circuit
• DTC C0267 or C0268 and C067 or C068 Pump Motor Circuit Open/Shorted
• DTC C0269 or C0274 and C069 or C074 Excessive Dump/Isolation Time
• DTC C0271-C0273 or C071 or C073 EBCM Malfunction
• DTC C0281 or C081 Brake Switch Circuit
• DTC C0286 or C086 ABS Indicator Lamp Circuit Shorted to B+
• DTC C0288 or C088 Brake Warning Lamp Circuit Shorted to B+

Electrical/Electronic Schematic Diagrams

• ABS Schematic References
• Antilock Brake System Schematic Icons
• Antilock Brake System Schematics

Gas, Vacuum and Fluids Schematics and Diagrams

• Brake Pressure Modulator Valve Hydraulic Flow Chart

General Diagnostic Information

• Clearing DTCs
• Diagnostic Trouble Code (DTC) List
• Displaying Diagnostic Trouble Codes (DTC)
• Intermittents and Poor Connections
• Scan Tool Diagnostics
• Self-Diagnostics

Mechanical Specifications

• Fastener Tightening Specifications

Other Specifications

• GM SPO Group Numbers

Removal, Installation, and Replacement

• Brake Pressure Modulator Valve Replacement
• Electronic Brake Control Module Replacement
• Tube Adapter Replacement
• Wheel Speed Sensor Replacement