Abs Brake Control System (Diagnostics)

• Service Precaution
• General Description
  • Notes
  • Functional Description
    • Hydraulic Unit (H/U)
      • Solenoid Valve
    • Normal Braking
    • Pressure Isolation (Pressure Maintain)
    • Pressure Reduction
    • Pressure Increase (Re-apply)
    • Brake Release
  • System Components
  • Electronic Hydraulic Control Unit (EHCU)
  • ABS Warning Light
  • Wheel Speed Sensor
  • G-Sensor
  • Normal and Anti-lock Braking
  • Brake Pedal Travel
  • Acronyms and Abbreviations
• General Diagnosis
  • General Information
  • ABS Service Precautions
    • Notes
    • J-39200 High Impedance Multimeter
  • Computer System Service Precautions
  • General Service Precautions
    • Notes
    • If the battery has been discharged
  • Note on Intermittents
  • Test Driving ABS Complaint Vehicles
  • "ABS" Warning Light
  • Normal Operation
    • "ABS" Warning Light
  • Tech 2 Scan Tool
    • Notes
    • Getting Started
    • Operating Procedure
  • Data List
  • Actuator Test
  • Tech 2 Service Bleed
  • Basic Diagnostic Flow Chart
  • Basic Inspection Procedure
    • Basic Inspection of Service Brake
    • Ground Inspection
• EHCU Connector Pin-out Checks
  • Notes
  • Circuit Diagram
  • Connector List
  • Part Location
• 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)
  • Diagnostic Trouble Codes (DTC) List
  • Chart B-1 With The Key In The On Position (Before Starting The Engine). Warning Light (W/L) Is Not Activated.
  • Chart B-2 CPU Error (DTC 14 (Flash Out) / C0271, C0272, C0273, C0284 (Serial Communications))
  • Chart B-3 Low or High Ignition Voltage (DTC 15 (Flash Out) / C0277, 0278 (Serial Communications))
  • Chart B-4 Excessive Dump Time (DTC 17 (Flash Out) / C0269 (Serial Communications))
  • Chart B-5 Excessive Isolation Time (DTC 18 (Flash Out) / C0274 (Serial Communications))
  • Chart B-6 G-Sensor Output Failure (DTC 21 (Flash Out) / C0276 (Serial Communications))
  • Chart B-7 Brake Switch Failure (DTC 22 (Flash Out) / C0281 (Serial Communications))
  • 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))
  • Chart B-9 Pump Motor Failure (DTC 32 (Flash Out) / C0267, C0268 (Serial Communications))
  • Chart B-10 EHCU Valve Relay Failure (DTC 35 (Flash Out) / C0265, C0266 (Serial Communications))
  • Chart B-11 FL Isolation Solenoid Coil Failure (DTC 41 (Flash Out) / C0245, C0247 (Serial Communications))
  • Chart B-12 FL Dump Solenoid Coil Failure (DTC 42 (Flash Out) / C0246, C0248 (Serial Communications))
  • Chart B-13 FR Isolation Solenoid Coil Failure (DTC 43 (Flash Out) / C0241, C0243 (Serial Communications))
  • Chart B-14 FR Dump Solenoid Coil Failure (DTC 44 (Flash Out) / C0242, C0244 (Serial Communications))
  • Chart B-15 Rear Isolation Solenoid Coil Failure (DTC 45 (Flash Out) / C0251, C0253 (Serial Communications))
  • Chart B-16 Rear Dump Solenoid Coil Failure (DTC 46 (Flash Out) / C0252, C0254 (Serial Communications))
  • Chart B-17 FL Speed Sensor Open or Shorted (DTC 51 (Flash Out) / C0225 (Serial Communications))
  • Chart B-18 FR Speed Sensor Open or Shorted (DTC 52 (Flash Out) / C0221 (Serial Communications))
  • Chart B-19 Rear Speed Sensor Open or Shorted (DTC 53 (Flash Out) / C0235 (Serial Communications))
  • Chart B-20 FL Speed Sensor Missing Signal (DTC 61 (Flash Out) / C0226, C0227 (Serial Communications))
  • Chart B-21 FR Speed Sensor Missing Signal (DTC 62 (Flash Out) / C0222, C0223 (Serial Communications))
  • Chart B-22 Rear Speed Sensor Missing Signal (DTC 63 (Flash Out) / C0236, C0237 (Serial Communications))
  • Chart B-23 Simultaneous Drop-out of Front Speed Sensor Signal (DTC 64 (Flash Out) / C0229 (Serial Communications))
  • Chart B-24 Wheel Speed Input Abnormality (DTC 65 (Flash Out) / C0238 (Serial Communications))
    • Notes
    • Sensor Signal Abnormality Criteria using TECH 2
  • Chart B-25 Abnormal TOD Signal Input (DTC 71 (Flash out)/C0287(Serial Communications))
• Unit Inspection Procedure
  • Notes
  • Chart C-1-1 FL Sensor Output Inspection Procedure
  • Chart C-1-2 FR Sensor Output Inspection Procedure
  • Chart C-1-3 Rear Sensor Output Inspection Procedure
  • Chart TC-1 Sensor Output Inspection Procedure
• Special Tools