TIGOR EV SERVICE MANUAL

BRAKES 22 10.4. ABS SYSTEM FAILURE WARNING LIGHT In normal conditions when the ignition is switched on the ABS and EBD lamp will come on and then switch off after 1 - 2 seconds. During this period the system will perform a self diagnostics to confirm all inputs and outputs are working correctly. If the ABS warning lamp remains ON after this time it means either: 1) The ABS system has not been connected or 2) The system has detected a failure and will need to be diagnosed. The EBD lamp is shared with the brake fluid level and parking brake, hence if the EBD warning lamp remains on after this time it means either: 1. The park brake is applied 2. The Brake fluid level is low 3. The ABS system has not been connected. or The system has detected a failure and will need to be diagnosed. If the warning light does not come on, the fault should be sought in the electrical connections (for ignition switch, ECU), fuse or warning lamp. If the ABS system detects any fault that may adversely affect its performance it will switch to a fail safe shut down mode. When this happens the electricity sup- ply to the solenoid valves is deactivated, stopping control signal output, this causes the valves to switch to their default state. (Open for inlet valves / Closed for Outlet valves) In this condition, the conventional hydraulic In this condition, the conventional hydraulic brake circuit will still function, allowing brake pressure to reach all wheels. It should be noted that with an ABS fault it will be possible to lock the wheels and in the Case of an EBD failure the brake force proportioning between front and rear will no longer function and hence rear wheel lock is possible before front. Cause of system failure System Warning Lamp ABS EBD ABS EBD None Operate Operate OFF OFF 1. Sensor failure Does not operate Operate ON OFF 2. Pump failure Does not operate Operate ON ON 3. Low voltage of battery Does not operate Operate (at = 6.5V) ON V>8.4 OFF V<8.4 ON 4. Failure of 2 or more sensors Valve failure ECU failure Other failure Does not operate Does not operate ON ON