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ABS ABS ABS ABS Anti-lock Anti-lock Anti-lock Anti-lock Brake Brake Brake Brake System System System System 93 Diagnosis Diagnosis Diagnosis Diagnosis and and and and Testing Testing Testing Testing 3. Reflux pump motor fault: C0110 Circuit description: ABS hydraulic unit with ECU integrates reflux pump with motor. Reflux pump relay shall stop operation and the Function: ABS Pressure reducing phase: Reflux pump shall operate to pump the brake fluid in the wheel cylinder of locked � EBD Pressure reducing phase: Pressure accumulator shall store the brake fluid flowed back from rear wheels. DTC Detection Condition Set Condition Possible Faulty Areas C0110 To be conducted at the and self-checking: Vehicle under stationary state or speed 1. After the reflux pump motor relay operates for 60ms, still no voltage 2. Under no operation of reflux pump motor relay, voltage detected by 3. If the reflux pump motor relay stop operation, no voltage drop is detected by reflux pump monitoring. 1. “Reflux pump motor circuit” inside ABS. 2. Open circuit of reflux pump motor relay. 3. Fault of reflux pump motor relay. 4. Fault of reflux pump motor wiring. 5. Imperfect ground. 6. Inadequate power supply. 7. Fault of reflux pump motor. Occurrence of fault shall give rise to the following operation: Braking Strategy Failure Protection � Fault of reflux pump relay: Reflux pump failed to � Wheel brake force control is disabled due to no � Brake system shall enter the conventional braking � ABS and EBD warning lamps shall be lit. Remarks: If the ignition switch is turned on after fault removal, the ABS and EBD warning lamps shall go out automatically Troubleshooting procedures S/N Operating Step Operation Detection Next Step 1 Parking the vehicle to (a) Turn off the ignition switch; (b) Is any noise heard from ABS hydraulic governor? Normal state: ABS reflux pump shall stop operation. Normal Go to the next step. Abnormal Go to Step 4 2 Inspection of self-checking of ABS hydraulic governor with ECU (a) Start the engine; (b) Run at speed of 10~15Km/h without brake pedal depressed; (c) Check if ABS warning lamp is lit and when necessary use diagnostic instrument to read DTC. Normal state: ABS warning lamp shall go out without Normal Go to the next step. Abnormal Repair based on DTC. |