Section 10 ABS DIAGNOSIS - Testroete

toyota Brake Systems - Course 552143 The ABS ECU has a self-diagnostic system which monitors the inputand output circuits. The ABS ECU operates the solenoid valves and thepump motor in sequence in order to check each respective electricalsystem. This function operates only once each time the ignition switchis turned ON. On some earlier models it operates when the vehicle istraveling at a speed greater than 4 mph with the stop light (brakelight) switch OFF. During this check the operation of the actuator canbe heard, however this is normal and does not indicate a Check FunctionThe check function mayvary depending on thenumber of RH Pressure Holding ValveFront RH Pressure Reduction ValveFront LH Pressure Holding ValveFront LH Pressure Reduction ValveRear RH Pressure Holding ValveRear RH Pressure Reduction ValveRear LH Pressure Holding ValveRear LH Pressure Reduction ValvePump MotorWhen a problem is detected in any of the signal systems, the ECUturns on the ABS warning light in the combination meter to

Section 10 ABS DIAGNOSIS Diagnosis and ... 144 TOYOTA Technical Training To access the diagnostic trouble codes stored in the ECU, locate the Data Link Connector (DLC1) or (DLC2). Consult the Repair Manual or the ABS Reference Card to determine whether the ABS Check Connector is

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