ANTI LOCK BRAKING SYSTEM (ABS) ANTI-LOCK BRAKING SYSTEM (ABS) TABLE OF CONTENTS 6.2.1 GENERAL INFORMATION............................................................................................1 6.2.1.1 NECESSITY OF ABS WITH EBD ................................................................................................... 1 6.2.1.2 TECHNICAL SPECIFICATIONS..................................................................................................... 2 6.2.1.3 TIGHTENING TORQUES ................................................................................................................ 3 6.2.1.4 SCHEMATIC OF HYDRAULIC CIRCUIT........................................................................................ 5 6.2.1.5 WORKING OF ANTI-LOCK BRAKING SYSTEM (ABS)................................................................ 6 6.2.1.6 COMPONENTS ............................................................................................................................. 10 A. ABS ELECTRONIC CONTROL UNIT / HYDRAULIC CONTROL UNIT (ECU / HCU).................. 11 B. WHEEL SPEED SENSOR (WSS) ................................................................................................. 14 C. ABS SYSTEM FAILURE WARNING LIGHT.................................................................................. 15 6.2.2 REPAIRS ........................................................................................................................16 A. ABS ECU / HCU............................................................................................................................. 16 B. FRONT WHEEL SPEED SENSOR ............................................................................................... 19 C. FRONT TONER RING ................................................................................................................... 20 D. REAR WHEEL SPEED SENSOR.................................................................................................. 20 E. REAR TONER RING...................................................................................................................... 22 6.2.3 TROUBLE SHOOTING AND DIAGNOSIS .....................................................................23 A. ROAD TEST................................................................................................................................... 23 B. TABLE OF ABS 8.1 - FALL-BACK LEVEL .................................................................................... 23 6.2.4 ABS DIAGNOSTIC USER MANUAL..............................................................................24 6.2.4.1 GENERAL ...................................................................................................................................... 24 6.2.4.2 OPERATING PROCEDURE.......................................................................................................... 25
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