Anti-lock braking system ABS — general description (Mitsubishi Colt 5)

The anti-lock braking system ABS consists of wheel speed sensors, a brake light switch, a hydraulic unit and an electronic control unit (ABS-ECU). If the system malfunctions, the faulty unit can be found by diagnostics. The MUT-II diagnostic tool can be used to read diagnostic codes and technical data, and to check actuators. The diagram of the ABS anti-lock braking system for left-hand drive vehicles is shown in Figure 14.34a, and the diagram of the ABS anti-lock braking system for right-hand drive vehicles is shown in Figure 14.34b. The technical characteristics of the ABS anti-lock braking system are given in Table 14.3. The technical data of the ABS anti-lock braking system are given in Table 14.4. The diagnostic codes of the ABS anti-lock braking system are given in Table 14.5.

Figure 14.34a. Schematic diagram of the ABS anti-lock braking system for left-hand drive vehicles: 1 - ABS valve relay; 2 - ABS drive relay; 3 - ABS warning light; 4 - Brake light switch; 5 - Wheel speed sensor rotor; 6 - Wheel speed sensor; 7 - ABS control unit; 8 - Diagnostic connector; 9 - Hydraulic block

Figure 14.346. Schematic diagram of the ABS anti-lock braking system for right-hand drive vehicles: 1 - ABS valve relay: 2 - ABS drive relay; 3 - ABS warning light; 4 - Brake light switch; 5 - Wheel speed sensor rotor; 6 - Wheel speed sensor; 7 - ABS control unit; 8 - Diagnostic connector; 9 - Hydraulic block