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.
2002 Isuzu Axiom Base, 4WDFACTORY OEM SERVICE PROCEDURE
Brake Control System
- Service Precaution
- General Description
- Acronyms And Abbreviations
- General Diagnosis
- EHCU Connector Pin-Out Checks
- Symptom Diagnosis
- Notes
- Chart A-1: Abs Works Frequently But Vehicle Does Not Decelerate
- Chart Ta-1: Abs Works Frequently But Vehicle Does Not Decelerate (Use Tech 2)
- Chart A-2: Uneven Braking Occurs While Abs Works
- Chart Ta-2: Uneven Braking Occurs While Abs Works (Use Tech 2)
- Chart A-3, Ta-3: The Wheels Are Locked
- Chart A-4: Brake Pedal Feed Is Abnormal
- Chart A-5, Ta-5: Braking Sound (From EHCU) Is Heard While Not Braking
- Diagnostic Trouble Codes
- Diagnosis By Abs Warning Light Illumination Pattern
- Notes
- Diagnostic Trouble Codes (DTCS)
- With The Key In The On Position (Before Starting The Engine). Warning Light
- DTC 14: CPU Error (Flash Out) C0271, C0272, C0273, C0284 (Serial Communications)
- DTC 15: Low Or High Ignition Voltage (Flash Out) C0277, C0278 (Serial Communications)
- DTC 17: Excessive Dump Time (Flash Out) C0269 (Serial Communications)
- DTC 18: Excessive Isolation Time (Flash Out) C0274 (Serial Communications)
- DTC 21: G-Sensor Output Failure (Flash Out) C0276 (Serial Communications)
- DTC 22: Brake Switch Failure (Flash Out) C0281 (Serial Communications)
- DTC 13: 2WD Controller In 4WD Vehicle Controller (Flash Out) C0285 (Serial Communications), DTC 24: 4WD State Input Signal Failure (Flash Out) C0282 (Serial Communications)
- DTC 32: Pump Motor Failure (Flash Out) C0267, C0268 (Serial Communications)
- DTC 35: EHCU Valve Relay Failure (Flash Out) C0265, C0266 (Serial Communications)
- DTC 41: Fl Isolation Solenoid Coil Failure (Flash Out) C0245, C0247 (Serial Communications)
- DTC 42: Fl Dump Solenoid Coil Failure (Flash Out) C0246, C0248 (Serial Communications)
- DTC 43: Fr Isolation Solenoid Coil Failure (Flash Out) C0241, C0243 (Serial Communications)
- DTC 44: Fr Dump Solenoid Coil Failure (Flash Out) C0242, C0244 (Serial Communications)
- DTC 45: Rear Isolation Solenoid Coil Failure (Flash Out) C0251, C0253 (Serial Communications)
- DTC 46: Rear Dump Solenoid Coil Failure (Flash Out) C0252, C0254 (Serial Communications)
- DTC 51: Fl Speed Sensor Open Or Shorted (Flash Out) C0225 (Serial Communications)
- DTC 52: Fr Speed Sensor Open Or Shorted (Flash Out) C0221 (Serial Communications)
- DTC 53: Rear Speed Sensor Open Or Shorted (Flash Out) C0235 (Serial Communications)
- DTC 61: Fl Speed Sensor Missing Signal (Flash Out) C0226, C0227 (Serial Communications)
- DTC 62: Fr Speed Sensor Missing Signal (Flash Out) C0222, C0223 (Serial Communications)
- DTC 63: Rear Speed Sensor Missing Signal (Flash Out) C0236, C0237 (Serial Communications)
- DTC 64: Simultaneous Drop-Out Of Front Speed Sensor Signal (Flash Out) C0229 (Serial Communications)
- DTC 65: Wheel Speed Input Abnormality (Flash Out) C0238 (Serial Communications)
- Sensor Signal Abnormality Criteria (Using Tech 2)
- Unit Inspection Procedure
- Special Tools
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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