5A–1
BRAKE CONTROL SYSTEM
RODEO
BRAKES
CONTENTS
Brake Control System 5A–1. . . . . . . . . . . . . . . . . . . .
Anti–lock Brake System 5B–1. . . . . . . . . . . . . . . . . .
Power–assisted Brake System 5C–1. . . . . . . . . . . .
Parking Brakes (4x4 Model) 5D1–1. . . . . . . . . . . . . .
Parking Brakes (4x2 Model) 5D2–1. . . . . . . . . . . . . .
Brake Control System
CONTENTS
Service Precaution 5A–2. . . . . . . . . . . . . . . . . . . . . .
General Description 5A–3. . . . . . . . . . . . . . . . . . . . .
Functional Description 5A–4. . . . . . . . . . . . . . . . .
System Components 5A–10. . . . . . . . . . . . . . . . . . .
Electronic Hydraulic Control Unit (EHCU) 5A–10.
ABS Warning Light 5A–10. . . . . . . . . . . . . . . . . . . .
Wheel Speed Sensor 5A–10. . . . . . . . . . . . . . . . . .
G-Sensor 5A–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal and Anti-lock Braking 5A–10. . . . . . . . . . .
Brake Pedal Travel 5A–10. . . . . . . . . . . . . . . . . . . .
Acronyms and Abbreviations 5A–10. . . . . . . . . . . .
General Diagnosis 5A–11. . . . . . . . . . . . . . . . . . . . . . .
General Information 5A–11. . . . . . . . . . . . . . . . . . . .
ABS Service Precautions 5A–11. . . . . . . . . . . . . . .
Computer System Service Precautions 5A–11. . .
General Service Precautions 5A–11. . . . . . . . . . . .
Note on Intermittents 5A–11. . . . . . . . . . . . . . . . . . .
Test Driving ABS Complaint Vehicles 5A–12. . . . .
“ABS” Warning Light 5A–12. . . . . . . . . . . . . . . . . . .
Normal Operation 5A–12. . . . . . . . . . . . . . . . . . . . .
Tech 2 Scan Tool 5A–13. . . . . . . . . . . . . . . . . . . . . .
DATA LIST 5A–16. . . . . . . . . . . . . . . . . . . . . . . . . . .
ACTUATOR TEST 5A–17. . . . . . . . . . . . . . . . . . . . .
Tech 2 Service Bleed 5A–21. . . . . . . . . . . . . . . . . .
Basic Diagnostic Flow Chart 5A–22. . . . . . . . . . . .
Basic Inspection Procedure 5A–23. . . . . . . . . . . . .
EHCU Connector Pin-out Checks 5A–24. . . . . . . . .
Circuit Diagram 5A–25. . . . . . . . . . . . . . . . . . . . . . .
Connector List 5A–28. . . . . . . . . . . . . . . . . . . . . . . .
Part Location 5A–29. . . . . . . . . . . . . . . . . . . . . . . . .
Symptom Diagnosis 5A–30. . . . . . . . . . . . . . . . . . . . .
Chart A-1 ABS Works Frequently But
Vehicle Does Not Decelerate 5A–30. . . . . . . . . . .
Chart TA-1 ABS Works Frequently But
Vehicle Does Not Decelerate
(Use TECH 2) 5A–31. . . . . . . . . . . . . . . . . . . . . . . .
Chart A-2 Uneven Braking Occurs While
ABS Works 5A–31. . . . . . . . . . . . . . . . . . . . . . . . . . .
Chart TA-2 Uneven Braking Occurs While
ABS Works (Use TECH 2) 5A–31. . . . . . . . . . . . .
Chart A-3, TA-3 The Wheels Are Locked 5A–32.
Chart A-4 Brake Pedal Feed Is Abnormal 5A–33.
Chart A-5, TA-5 Braking Sound
(From EHCU) Is Heard While Not Braking 5A–34
Diagnostic Trouble Codes 5A–35. . . . . . . . . . . . . . . .
Diagnosis By “ABS” Warning Light
Illumination Pattern 5A–37. . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Codes (DTCs) 5A–38. . . . . . .
Chart B-1 With the key in the ON position
(Before starting the engine). Warning
light (W/L) is not activated. 5A–40. . . . . . . . . . . . .
Chart B-2 CPU Error (DTC 14 (Flash out) /
C0271, C0272, C0273, C0284 (Serial
communications)) 5A–41. . . . . . . . . . . . . . . . . . . . .
Chart B-3 Low or High Ignition Voltage
(DTC 15 (Flash out) / C0277, 0278
(Serial communications)) 5A–41. . . . . . . . . . . . . . .
Chart B-4 Excessive Dump Time
(DTC 17 (Flash out) / C0269
(Serial communications)) 5A–41. . . . . . . . . . . . . . .
Chart B-5 Excessive Isolation Time
(DTC 18 (Flash out) / C0274
(Serial communications)) 5A–42. . . . . . . . . . . . . . .
Chart B-6 G-Sensor Output Failure
(DTC 21 (Flash out) / C0276
(Serial communications)) 5A–42. . . . . . . . . . . . . . .
Chart B-7 Brake Switch Failure
(DTC 22 (Flash out) / C0281
(Serial communications)) 5A–42. . . . . . . . . . . . . . .
Chart B-8 2WD Controller in 4WD Vehicle
Controller (DTC 13 (Flash out) / C0285
(Serial communications)), 4WD State Input
Signal Failure (DTC 24 (Flash out) / C0282
(Serial communications)) 5A–43. . . . . . . . . . . . . . .
Chart B-9 Pump Motor Failure (DTC 32
(Flash out) / C0267, C0268
(Serial communications)) 5A–43. . . . . . . . . . . . . . .
Chart B-10 EHCU Valve Relay Failure
(DTC 35 (Flash out) / C0265, C0266
(Serial communications)) 5A–44. . . . . . . . . . . . . . .
Chart B-11 FL Isolation Solenoid Coil Failure
(DTC 41 (Flash out) / C0245, C0247
(Serial communications)) 5A–44. . . . . . . . . . . . . . .
Chart B-12 FL Dump Solenoid Coil Failure
(DTC 42 (Flash out) / C0246, C0248
(Serial communications)) 5A–44. . . . . . . . . . . . . . .
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