SAFARI STORME MY14

ANTI LOCK BRAKING SYSTEM (ABS) 22 6.2.3 TROUBLE SHOOTING AND DIAGNOSIS While the key is in IGN position, the ABS ECU monitors the system for faults. Diagnostic information and system function monitoring can be accessed by connecting diagnostic tool to the vehicle diagnostic connector. After detecting a fault, the ABS ECU will select a suitable default strategy which will retain, if possible, some operational ABS capability. If ABS is not active, conventional braking will remain available. A. ROAD TEST !! WARNING It is essential that brake pedal travel is not obstructed by items such as extra floor mats. (a) While driving the vehicle with ABS Observe the warning lights, check parking brake/fluid warning light extinguishes after initial bulb check and when the parking brake is released, indicating that power assistance is available. (b) Normal ABS brake operation In road conditions where surface friction is sufficient to slow or stop the vehicle without wheel lock, ABS does not operate. In an emergency braking situation, if one or more wheels begin to slow rapidly in relation to vehicle speed, ABS will detect wheel locking tendency and will regulate brake pressure to maintain wheel rotation. (c) Brake application with partial failure: !! WARNING If a fault develops in the brake system it is essential that it is investigated immediately. i. TMC failure If during braking, a drastically reduced resistance is detected at the pedal and braking effectiveness is very much reduced, failure of the non-powered (master cylinder) portion of system is indicated. If this occurs, do not pump the brake pedal. Push the pedal through free movement to obtain braking effort from the power circuit. ii. Brake Booster failure. When power assistance is not available, braking effort is only available from the master cylinder In this case the pedal travel will be or feel shorter as there is no assistance and greater effort will be required to stop the vehicle. !! WARNING Foot pressure on the pedal, using master cylinder only, will not achieve the same degree of braking as is available from power assistance. ii. Insufficient fluid in TMC If there is insufficient fluid in master cylinder to create pressure, braking to all four wheels is retained and ABS remains operative. The red warning light (fluid level indicator lamp) will be illuminated if the level in fluid reservoir is low (due to leakage of fluid) enough to actuate fluid level switch. !! WARNING Longer pedal travel is required, but power assisted braking is available at reduced efficiency. B. TABLE OF ABS 8.1 - FALL-BACK LEVEL ABS FALLBACK LEVEL ABS Warning Lamp Brake Lamp Status System System active Lamp System active Lamp System active with limitation YES OFF NO ON System active YES OFF YES OFF Emergency - EBD NO ON YES OFF System passive NO ON NO ON NOTE For brake bleeding procedure conventional/ using diagnostic tool refer Brakes group.