Toyota Sienna Service Manual: On-vehicle inspection
1. INSPECT BRAKE BOOSTER
(a) Air tightness check.
(1) Start the engine and stop it after 1 or 2 minutes.
Depress the brake pedal several times slowly.
HINT: If the pedal goes down farthest at the 1st time, and gradually rises at the 2nd or 3rd time, the booster is airtight.
(2) Depress the brake pedal while the engine is running, and stop the engine with the pedal depressed.
HINT: If there is no change in the pedal reserve distance after holding the pedal for 30 seconds, the booster is airtight.
(b) Operating check.
(1) Depress the brake pedal several times with the ignition switch OFF and check that there is no change in the pedal reserve distance.
(2) Depress the brake pedal and start the engine.
HINT: If the pedal goes down slightly, the operation is normal.
Brake booster
COMPONENTS
...
Removal
NOTICE:
Do not adjust the brake booster push rod.
Do not change the combination of the diameter
converting unit and brake.
1. REMOVE FRONT WHEEL
2. DRAIN BRAKE FLUID
NOTICE:
Wash the bra ...
Other materials:
TRAC OFF Indicator Light does not Come ON
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and
multiplex communications.
When the traction OFF switch is turned on, the TRAC OFF indicator light will
come on (for 2WD model).
WIRING DIAGRAM
Refer to TRAC OFF Indicator Light Remains ON (See page BC-157).
...
Auto Up / Down Function does not Operate
DESCRIPTION
If the AUTO UP/DOWN function does not operate, any of the following troubles
may be the cause:
When the PWR fuse or the power window relay (Marking: PWR) is
replaced with new ones, or when
the battery terminal and the connector of the power window master switch are
d ...
Right Front Wheel Speed Sensor Signal
DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the
ECU. These signals are
used to control the ABS control system. The front and rear rotors have 48
serrations each.
When the rotors rotate, the magnetic field emitted by the permanent magnet in
t ...
