HYDRAULIC UNIT CHECK

3. caution To prevent damage to M.U.T.-III, always turn the ignition switch to the "LOOK" (OFF) position before connecting or disconnecting the M.U.T.-III. Turn the ignition switch to the "LOCK" (OFF) position and set the M.U.T.-III as shown in the illustration. 4.After checking that the shift lever is in neutral, start the engine. 5.Release the parking brake, and use the M.U.T.-III to perform the actuator test with depressing the brake pedal. Confirm that the brake drag force varies by braking force tester or by rotating the wheel with your hand. note The ABS system will switch to the M.U.T.-III mode and the ABS warning lamp will illuminate. note When the ABS has been interrupted by the fail-safe function, the M.U.T.-III actuator testing cannot be used. note The ABS warning lamp continues illuminating until the communication between M.U.T.-III and ABS-ECU is completed. 6. This is indicated as shown above. 7.If the result of inspection is abnormal, repair according to the Diagnosis Table below. Diagnosis Table M.U.T.-III Display Operation Inspection result Judgment Probable cause Remedy 01 FR VALVE 02 FL VALVE 03 RR VALVE 04 RL VALVE Depress brake pedal to lock wheel. Using the M.U.T.-III, select the wheel to be checked and force the actuator to operate. Turn the selected wheel manually to check the change of brake force. Brake force is released for three seconds after wheels have been locked. Normal - - Wheel does not lock when brake pedal is depressed. Abnormal Clogged brake line other than hydraulic unit Check and clean brake line Clogged hydraulic circuit in hydraulic unit Replace hydraulic unit assembly Brake force is not released Incorrect hydraulic unit brake tube connection Connect correctly Hydraulic unit solenoid valve not functioning correctly Replace hydraulic unit assembly 8.After inspection, disconnect the M.U.T.-III immediately after turning the ignition switch to the "LOCK" (OFF) position.