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1.Jack up the vehicle. Then support the vehicle with rigid racks at the specified jack-up points or place the front or rear wheels on the rollers of the braking force tester.
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2.Release the parking brake, and feel the drag force (drag torque) on each road wheel. When using the braking force tester, take a reading of the brake drag force.
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3.
| caution |
Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
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Connect M.U.T.-III to the 16-pin diagnosis connector.
4.After checking that the selector lever is in "P" range, start the engine.
5.Select "Interactive Diagnosis" from the start-up screen.
6.Select "System Select."
7.Choose "ABS/ASC/ASTC" from the "CHASSIS" tab.
8.Select "Actuator Test" from "ABS/ASC/ASTC" screen.
9.Choose an appropriate item for hydraulic unit check.
| note |
The ASTC system will switch to the M.U.T.-III mode and the ABS warning lamp, ASTC indicator lamp and ASTC OFF indicator lamp will illuminates.
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| note |
When the ABS and ASTC has been interrupted by the fail-safe function, M.U.T.-III actuator testing cannot be used.
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10.Turn the wheel by hand and check the change in braking force when the brake pedal is depressed. When using the braking force tester, depress the brake pedal until the braking force is at the following values, and check that the braking force changes to the brake drag force reading taken in step 2 when the actuator is force-driven. The result should be as shown in the diagram above.
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Front wheel
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785 - 981 N
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Rear wheel
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588 - 784 N
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11.If the result of inspection is abnormal, repair according to the Diagnosis Table below.
Diagnosis Table
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M.U.T.-III Display
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Operation
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Inspection result
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Judgment
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Probable cause
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Remedy
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01 FL wheel ABS drive
02 FR wheel ABS drive
03 RL wheel ABS drive
04 RR wheel ABS drive
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- Depress brake pedal to lock wheel.
- Using 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.
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Brake force is released for three seconds after wheels have been locked.
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Normal
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-
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-
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Wheel does not lock when brake pedal is depressed.
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Abnormal
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Clogged brake line other than hydraulic unit
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Check and clean brake line
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Clogged hydraulic circuit in hydraulic unit
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Replace hydraulic unit assembly
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Brake force is not released
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Incorrect hydraulic unit brake tube connection
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Connect correctly
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Hydraulic unit solenoid valve not functioning correctly
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Replace hydraulic unit assembly
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05 FL wheel TCL drive
06 FR wheel TCL drive
07 RL wheel TCL drive
08 RR wheel TCL drive
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- Using 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.
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The wheel is locked for three seconds from the state without braking force.
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Normal
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-
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-
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The wheel is not locked.
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Abnormal
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- Incorrect hydraulic unit brake tube connection
- Clogged brake line other than hydraulic unit
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Check and clean brake line
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Clogged hydraulic circuit in hydraulic unit
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Replace hydraulic unit assembly
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12.After inspection, disconnect M.U.T.-III immediately after turning the ignition switch to the "LOCK" (OFF) position.
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