Isuzu ABS Manual (EN)

Service Precaution

HOME ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-1 SECTION 5A4 ANTI-LOCK BRAKE SYSTEM (ABS) Service Precaution CAUTION: Always use the correct fastener in the proper location. When you replace a fastener, use ONLY the exact part number for that application. ISUZU will call out those fasteners that require a replacement after removal. ISUZU will also call out the fasteners that require thread lockers or thread sealant. UNLESS OTHERWISE SPECIFIED, do not use supplemental coatings (Paints, greases, or other corrosion inhibitors) on threaded fasteners or fastener joint interfaces. Generally, such coatings adversely affect the fastener torque and the joint clamping force, and may damage the fastener.

When you install fasteners, use the correct tightening sequence and specifications. Following these instructions can help you avoid damage to parts and systems.

CONTENTS PAGE Service Precaution ..........................................................................................................5A4 -1 General Description ........................................................................................................5A4 -5 System Components ..................................................................................................5A4 -6 Electronic Hydraulic Control Unit (EHCU) ................................................................5A4 -6 Hydraulic Unit (HU).....................................................................................................5A4 -6 ABS Warning Light .....................................................................................................5A4 -6 Wheel Speed Sensor ..................................................................................................5A4 -6 Normal and Anti-lock Braking....................................................................................5A4 -6 Brake Pedal Travel......................................................................................................5A4 -7 Acronyms and Abbreviations ....................................................................................5A4 -7 General Diagnosis...........................................................................................................5A4 -7 General Information....................................................................................................5A4 -7 ABS Service Precautions...........................................................................................5A4 -7 Computer System Service Precautions....................................................................5A4 -7 General Service Precautions .....................................................................................5A4 -8 Note on Intermittents..................................................................................................5A4 -8 Test Driving ABS Complaint Vehicles.......................................................................5A4 -8 “ABS” Warning Light..................................................................................................5A4 -8 Normal Operation .......................................................................................................5A4 -8 Basic Diagnostic Flow Chart .....................................................................................5A4 -9 Basic Inspection Procedure.......................................................................................5A4 -9

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Service Precaution

5A4-2 ANTI-LOCK BRAKE SYSTEM (ABS) Tech 2 Scan Tool ........................................................................................................5A4 -10 Tech 2 Features ..........................................................................................................5A4 -11 Getting Started............................................................................................................5A4 -11 Operating Procedure (For Example) .........................................................................5A4 -12 DTC Modes..................................................................................................................5A4 -13 DTC Information Mode ...............................................................................................5A4 -13 Plotting Snapshot Graph............................................................................................5A4 -14 Plotting Graph Flow Chart (Plotting graph after obtaining vehicle information) ..5A4 -15 Flow Chart for Snapshot Replay (Plotting Graph) ...................................................5A4 -16 Tech 2 Data Display....................................................................................................5A4 -17 Special Function .........................................................................................................5A4 -17 EHCU Connector Pin-out Checks..............................................................................5A4 -21 Circuit Diagram ...........................................................................................................5A4 -22 Connector List ............................................................................................................5A4 -26 Part Location...............................................................................................................5A4 -29 Symptom Diagnosis........................................................................................................5A4 -30 Chart A-1 ABS Works Frequently But Vehicle Does Not Decelerate......................5A4 -30 Chart TA-1 ABS Works Frequently But Vehicle Does Not Decelerate (Use TECH 2) ...........................................................................5A4 -30 Chart A-2 Uneven Braking Occurs While ABS Works .............................................5A4 -31 Chart A-3, TA-3 The Wheels Are Locked...................................................................5A4 -31 Chart A-4 Brake Pedal Feed Is Abnormal .................................................................5A4 -32 Chart A-5, TA-5 Braking Sound (From Hydraulic Unit) Is Heard While Not Braking........................................................................................5A4 -33 Diagnostic Trouble Codes..............................................................................................5A4 -34 Diagnosis By “ABS” Warning Light Illumination Pattern ............................................5A4 -35 Diagnostic Trouble Codes (DTCs).............................................................................5A4 -35 Chart B-1-1 With the key in the ON position (Before starting the engine).

Warning light (W/L) is not activated..........................................................................5A4 -39 Chart 1 (DTC 13/C0213) Vehicle Type Error..............................................................5A4 -40 Chart 2 (DTC 14/C0214) Low Power Voltage of Rear Sensor or EHCU Abnormality ...........................................................................5A4 -40 Chart 3 (DTC 15/C0215) Low Power Voltage OUT of Range ...................................5A4 -41 Chart 4 (DTC 25/C0225) Exhaust Brake Cut Circuit Abnormality ...........................5A4 -42 Chart 5 (DTC 33/C0233) Motor Drive Circuit Abnormality .......................................5A4 -42

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Service Precaution

ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-3 Chart 6 (DTC 34/C0234) Abnormal Motor Rotation ..................................................5A4 -42 Chart 7 (DTC 41/C0241) Solenoid Valve Power Supply Abnormality .....................5A4 -43 Chart 8 (DTC 43, 45/C0243, C0245) Solenoid Valve Circuit Abnormality ...............5A4 -43 Chart 9 (DTC 51/C0251) FL Speed Sensor Circuit Abnormality..............................5A4 -43 Chart 10 (DTC 52/C0252) FR Speed Sensor Circuit Abnormality............................5A4 -43 Chart 11 (DTC 53/C0253) RL Speed Sensor Circuit Abnormality............................5A4 -44 Chart 12 (DTC 54/C0254) RR Speed Sensor Circuit Abnormality ...........................5A4 -45 Chart 13 (DTC 61/C0261) Abnormal FL Speed Sensor Signal.................................5A4 -46 Chart 14 (DTC 62/C0262) Abnormal FR Speed Sensor Signal ................................5A4 -48 Chart 15 (DTC 63/C0263) Abnormal RL Speed Sensor Signal ................................5A4- 50 Chart 16 (DTC 64/C0264) Abnormal RR Speed Sensor Signal................................5A4- 51 Chart 17 (DTC 65/C0265) Tire Size Error...................................................................5A4- 52 Unit Inspection Procedure..............................................................................................5A4- 53 Chart C-1-1 FL Speed Sensor Output Inspection Procedure..................................5A4- 53 Chart C-1-2 FR Speed Sensor Output Inspection Procedure..................................5A4- 54 Chart C-1-3 RL Speed Sensor Output Inspection Procedure..................................5A4- 55 Chart C-1-4 RR Speed Sensor Output Inspection Procedure .................................5A4- 57 Chart TC-1 Sensor Output Inspection Procedure (Use TECH 2) ............................5A4- 58 Electronic Hydraulic Control Unit (EHCU).....................................................................5A4- 59 Removal.......................................................................................................................5A4- 59 Installation...................................................................................................................5A4- 59 Front Speed Sensor ........................................................................................................5A4- 60 Front Speed Sensor and Associated Parts ..............................................................5A4- 60 Removal.......................................................................................................................5A4- 60 Inspection and Repair ................................................................................................5A4- 60 Installation...................................................................................................................5A4- 60 Front Speed Sensor Rotor..............................................................................................5A4- 61 Front Speed Sensor Rotor and Associated Parts....................................................5A4- 61 Removal.......................................................................................................................5A4- 61 Inspection and Repair ................................................................................................5A4- 62 Installation...................................................................................................................5A4- 62 Rear Speed Sensor .........................................................................................................5A4- 63 Rear Speed Sensor and Associated Parts................................................................5A4- 63 Removal.......................................................................................................................5A4- 64 Inspection and Repair ................................................................................................5A4- 64

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Service Precaution

5A4-4 ANTI-LOCK BRAKE SYSTEM (ABS) Installation...................................................................................................................5A4- 64 Rear Speed Sensor Rotor...............................................................................................5A4- 65 Rear Speed Sensor Rotor and Associated Parts.....................................................5A4- 65 Removal.......................................................................................................................5A4- 65 Inspection and Repair ................................................................................................5A4- 65 Installation...................................................................................................................5A4- 65 Special Tools ...................................................................................................................5A4- 67

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