ROLLS-ROYCE Silver Spirit and Bentley Mulsanne 1987-1989 Model Years 20,000-Series Supplement ABS Braking System

Introduction

The anti-lock braking system electronic control unit (ABS ECU) has a self-check programme, activated whenever the car is operating. If a fault is detected, the system switches off and the ABS warning panel on the driver’s information panel (DIP) illuminates.

Check Procedure

Connect test box RH 9882 and proceed as stated in the Workshop Manual. When checking that wheel speed sensors are operating correctly, and connections are correct; switch position 6 should be selected.

Steps to follow:

1. Jack up the vehicle
2. Turn on the ignition
3. Ensure the wheel to be tested is free to rotate by hand, and when testing the rear wheels, the wheel not being tested must be held
4. Set the wheel speed selection switch to the wheel to be tested
5. Turn the wheel by hand at approximately one revolution per second until the LED indicator for rotary motion of the wheels illuminates without flickering
6. Read the instrument indication

Possible causes of fault:

• a.) Wheel speed sensor lead is incorrectly connected or open circuit
• b.) Wheel bearing play is excessive. Toothed wheel defective or loose. Air gap between wheel speed sensor and toothed wheel blocked with debris, or incorrect to specification

Manual:

Download: ROLLS-ROYCE Silver Spirit and Bentley Mulsanne 1987-1989 Model Years 20,000-Series Supplement ABS Braking System

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