REAR AXLE –
Troubleshooting <AYC>
27-27
ACTUATOR TEST REFERENCE TABLE
The following items can be tested by driving the corresponding actuator forcibly using the MUT-
II
.
Item No.
Check item
Checking requirements
Normal value
10
Air bleeding
Supply current to proportioning
valve in accordance with steering
angle to operate directional valve.
No air is to be bled from the
bleeder plug on the torque transfer
differential.
11
Oil level check
Let the directional valve operate to
left and right 20 times.
To be checked by oil level in
reservoir tank.
12
Electric pump operation
Let the electric pump operate for 5
seconds.
Operation sounds of the electric
pump are to be heard.
13
Clutch operation (left)
Let the directional valve operate to
supply the maximum pressure to the
left clutch.
The operation conditions are to be
checked by the speed difference
between left and right rear wheels
with the wheels raised. For details,
refer to AYC Operation Check on
P.27-34.
14
Clutch operation (right)
Let the directional valve operate to
supply the maximum pressure to the
right clutch.
The operation conditions are to be
checked by the speed difference
between left and right rear wheels
with the wheels raised. For details,
refer to AYC Operation Check on
P.27-34.
15
Control OFF
Turn off the electric pump relay to
deactivate AYC control.
During the test run, some
differences are to be recognized in
running behaviors between when
the system is ON and when it is
OFF.
NOTE
(1) The actuator test is feasible only when the following requirements are all satisfied.
D
All of inputs from four wheel speed sensors show 20 km/h or lower.
D
No system failure is registered.
D
The steering angle is within
±
30 deg. from the neutral position.
(2) The actuator test comes to an end when either of the following conditions is met since the forced
actuation is canceled.
D
Either of inputs from four wheel sensors shows higher than 20 km/h (with exception of Item
No.15 “Control OFF”).
D
Some trouble with the system is registered.
D
Forced activation time expires.
D
MUT-
II
is removed.
D
The clear key of MUT-
II
is operated.