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ABS ABS ABS ABS Anti-lock Anti-lock Anti-lock Anti-lock Brake Brake Brake Brake System System System System 100 Troubleshooting Troubleshooting Troubleshooting Troubleshooting procedures procedures procedures procedures S/N Operating Step Operation Detection Next Step 1 Checking fuse (a) Check if the 10A, 25A and 40A fuses for power supply ECU of ABS operate normally. Normal: Continuity Yes Go to the next step. No Check fuse circuit. 2 Using multimeter to (a) Check battery voltage under various conditions. coldest mode/blower turned to the maximum speed ② Parking: With all electrical equipments turned off, rotation speed increased to 3500rpm and hold on for 30s ③ During application of service brake Normal value: 10~16.9V Yes Go to the next step. No Check charging system. 3 Using diagnostic instrument to read battery voltage (a) Connect the diagnostic instrument to read battery voltage under various conditions. ① Idling: with headlamp turned on, A/C turned to the coldest mode/blower turned to the maximum speed ② Parking: With all electrical equipments turned off, rotation speed increased to 3500rpm and hold on for 30s ③ During application of service brake Normal value: 10~16.9V Yes Intermittent fault, go No Go to the next step. 4 Checking voltage of (a) Turn off the ignition switch. (b) Remove connectors from ABS hydraulic governor with ECU. (c) With ignition switch turned on, use multimeter to measure if driving voltage of each solenoid valve, motor Normal Go to the next step. Abnormal Check and repair circuit. 5 Fault reconfirmation (a) Simulate fault for reconfirmation. (b) Read DTC. Normal state: No DTC memory Normal Go to the next step. Abnormal Replace the ABS hydraulic governor with ECU. 6 Intermittent fault (a) If it is intermittent fault, please return the vehicle to customer, for the fault cannot be located at that moment. (b) Ask the customer to record relevant data once the same fault occurs: · Vehicle speed · With/without brake pedal depressed · Weather · Road condition and etc. 7 Conduct final inspection to confirm (a) Clear DTC (b) With ignition switch turned on, ABS has no DTC memory.
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