1999-2001 Isuzu Elf Truck N Series, NKR, NPR, NQR Anti-Lock Brake System (ABS) workshop manual

Table of Contents

Anti-Lock Brake System (ABS) Workshop Manual

Service Precaution

General Description

System Components

• Electronic Hydraulic Control Unit (EHCU)
• Hydraulic Unit (HU)
• ABS Warning Light
• Wheel Speed Sensor
• Normal and Anti-lock Braking
• Brake Pedal Travel
• Acronyms and Abbreviations

General Diagnosis

• General Information
• ABS Brake Functions
• Computer System Service Precautions
• General Service Precautions
• Note on Intermittents
• Test Driving ABS Complaint Vehicles
• ABS Warning Light
• Normal Operation
• Basic Diagnostic Flow Chart
• Basic Inspection Procedure

Tech 2 Scan Tool

• Tech 2 Scan Tool
• Tech 2 Features
• Getting Started
• Operating Procedure (For Example)
• DTC Modes
• DTC Information Mode
• Plotting Snapshot Graph
• Plotting Graph Flow Chart (Plotting graph after obtaining vehicle information)
• Tech 2 Chart for Snapshot Replay (Plotting Graph)
• Tech 2 Data Display

Special Function

• Special Function
• EHCU During Pin-out Checks
• Circuit Diagram
• Connector Location

Symptom Diagnosis

• Chart A-1 ABS Works Frequently But Vehicle Does Not Decelerate
• Chart TA-1 ABS Works Frequently But Vehicle Does Not Decelerate Using TCCS
• Chart A-2 Brake Dragging Occurs While ABS Works
• Chart A-3 ABS Travels Are Locked
• Chart A-4 Brake Pedal Feels Abnormal
• Chart A-5 Abnormal Sound from Hydraulic Unit

Diagnostic Trouble Codes

• How to Trouble Codes
• Chart B-1 ABS Warning Light Illumination Pattern
• Diagnostic Trouble Codes
  • Chart 1-1 With Key on No DTCs Displayed (Before starting the engine)
  • Chart 2 (DTC 11) Solenoid Valve Circuit Abnormality
  • Chart 3 (DTC 12) Solenoid Valve Circuit Abnormality
  • Chart 4 (DTC 13) Coil Power Voltage Circuit Abnormality
  • Chart 5 (DTC 32) Motor Drive Circuit Abnormality
  • Chart 6 (DTC 34/C0234) Abnormal Motor Rotation
  • Chart 7 (DTC 41/C0234) Solenoid Valve Power Supply Abnormality
  • Chart 8 (DTC 43, 44/C0234, C0245) Solenoid Valve Circuit Abnormality
  • Chart 9 (DTC 51/C0235) FR Speed Sensor Circuit Abnormality
  • Chart 10 (DTC 52/C0235) FL Speed Sensor Circuit Abnormality
  • Chart 11 (DTC 53/C0235) RR Speed Sensor Circuit Abnormality
  • Chart 12 (DTC 54/C0235) RL Speed Sensor Circuit Abnormality
  • Chart 13 (DTC 61) Abnormal FR Speed Sensor Signal
  • Chart 14 (DTC 62) Abnormal FL Speed Sensor Signal
  • Chart 15 (DTC 63) Abnormal RR Speed Sensor Signal
  • Chart 16 (DTC 64) Abnormal RL Speed Sensor Signal

Unit Inspection Procedures

• C-1 FR Speed Sensor Output Inspection Procedure
• C-2 FL Speed Sensor Output Inspection Procedure
• C-3 RR Speed Sensor Output Inspection Procedure
• C-4 RL Speed Sensor Output Inspection Procedure
• Chart C-1 Sensor Output Inspection Procedure (Use TECH 2)

Electronic Hydraulic Control Unit (EHCU)

• Removal
• Installation

Front Speed Sensor

• General Information
• Removal
• Inspection and Associated Parts
• Installation

Front Speed Sensor Rotor

• General Information
• Removal
• Inspection and Repair
• Installation

Rear Speed Sensor

• General Information
• Removal
• Inspection and Associated Parts
• Installation

Rear Speed Sensor Rotor

• General Information
• Removal
• Inspection and Repair
• Installation

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