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04 ABS Control Unit Main Control Self-diagnosis Function On-board Diagnosis Function 19-41 RIGHT-REAR WHEEL SENSOR LEFT-REAR WHEEL SENSOR RIGHT-FRONT WHEEL SENSOR LEFT-FRONT WHEEL SENSOR DETECT WHEEL SPEED DETECT WHEEL SPEED DETECT WHEEL SPEED DETECT WHEEL SPEED DETECT VEHICLE SPEED SELECT LOW DETECT SLIP RATE DETECT SLIP RATE DETECT SLIP RATE RIGHT-FRONT LEFT-FRONT REAR REFERENCE ABS CONTROL ABS CONTROL ABS CONTROL DRIVE SOLENOID DRIVE SOLENOID DRIVE SOLENOID DRIVE SOLENOID RIGHT-REAR SOLENOID LEFT-REAR SOLENOID RIGHT-FRONT SOLENOID LEFT-FRONT SOLENOID ABS CONTROL UNIT The ABS control unit detects the wheel speed based on the wheel sensor signal it received, then it calculates the The ABS control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit The hydraulic control has three modes: Pressure reducing, pressure retaining, and pressure intensifying. 1. The ABS control unit is equipped with a main CPU and a subCPU. Each CPU checks the other for problems. operation. 4. The self-diagnosis can be classified into these two categories: • Initial diagnosis The ABS can be diagnosed with the HDS. (cont’d) 05/06/27 18:20:29 61S6M040_190_0041 |