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.
2003 Ford Explorer 4.0 E, AWDFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake Control System
- Component Location
- Specifications
- Description And Operation
- Anti-Lock Control
- Anti-Lock Brake System (ABS)
- Anti-Lock Brake System (ABS) With Traction Control and Stability Assist
- Principles of Operation
- Traction Control and Stability Assist
- Yaw Rate Sensor
- Lateral Accelerometer
- Longitudinal Accelerometer (4x4 Vehicles)
- Steering Wheel Rotation Sensor
- Active Brake Booster
- Electronic Brake Distribution
- Panic Assist Braking
- DTC C1963
- Stability Assist Module Configuration and Calibration
- Anti-Lock Control
- Diagnosis And Testing
- Anti-Lock Control
- Notes
- Special Tool(s)
- Inspection and Verification
- ABS (With or Without Advance Trac and Stability Assist) Module Diagnostic Trouble Code (DTC) Index
- ABS with Advance Trac Calibration List
- Symptom Chart
- Connector Reference and Terminal Readings
- Anti-Lock Brake System (ABS) Connector C155
- Instrument Cluster Connector C220A
- Accelerometer/Yaw Rate Sensor C3179
- Steering Wheel Rotation Sensor C226
- Active Brake Booster C149
- Brake Pressure Transducer C147
- Advance Trac Switch C280
- LF Wheel Speed Sensor C150
- RF Wheel Speed Sensor C160
- LR Wheel Speed Sensor C440 (4-Channel ABS)
- RR Wheel Speed Sensor C426 (4-Channel ABS)
- Rear Differential Wheel Speed Sensor C455 (3-Channel ABS)
- Brake Pressure Switch C1025 (ABS Only)
- Pinpoint Tests
- Pinpoint Test A: No Communication With the ABS Module
- Pinpoint Test B: DTC B1483 - Brake Pedal Input Circuit Failure
- Pinpoint Test C: DTC B1676 - Battery Pack Voltage Out Of Range
- Pinpoint Test D: DTC C1095 - ABS Hydraulic Pump Motor Circuit Failure
- Pinpoint Test E: DTC C1145 (RF), DTC C1155 (LF), DTC C1165 (RR), DTC C1175 (LR) - Wheel Speed Sensor Input Circuit Failure
- Pinpoint Test F: DTC C1233 (LF), DTC C1234 (RF), DTC C1235 (RR), DTC 1236 (LR) - Wheel Speed Sensor input Signal Missing
- Pinpoint Test G: DTC C1277/C1278 - Steering Wheel Angle 1 and 2 Circuit Failure/Faulted
- Pinpoint Test H: DTC C1279, C1280, C1281, C1282, C2769, C2770 - Sensor Cluster Fault
- Pinpoint Test I: DTC C1285 - Booster Solenoid Circuit Failure
- Pinpoint Test J: DTC C1287 - Brake Booster Pedal Force Switch Circuit Failure
- Pinpoint Test K: DTC C1288/C1440 - Brake Pressure Transducer Input Circuit Failure
- Pinpoint Test L: DTC C1730 - Reference Voltage Out Of Range (+5 V)
- Pinpoint Test M: DTC C1960 - Driver Brake Apply Circuit Fault
- Pinpoint Test N: The Advance Trac Is Inoperative
- Pinpoint Test O: Advance Trac Switch Indicator Is Always On/Cannot Be Disabled
- Pinpoint Test P: DTC C1440 - Pressure Transducer Signal Fault
- Pinpoint Test Q: DTC C1998 - Module Calibration Not Complete
- Pinpoint Test R: DTC C2777 and DTC C2778 - Sensor Cluster Bus Failure
- Anti-Lock Control
- Removal And Installation
Factory Service Tools
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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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