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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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![](../../../img/35/AC310120AB00ENG.png)
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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.
![](../../../img/35/AC106011AC01ENG.png) 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.
|