INSPECTION
1. INSPECT UNLOCK WARNING SWITCH ASSEMBLY

Standard resistance

Door control switch
Front door lockWhen servicing full-time 4wd vehicles
The full-time 4WD SIENNA is equipped with the open
center differential system.
If incorrect preparations or test procedures are used, the
test will not only be unsuccessful, but may be dangerous
as well.
Therefore, before beginning any such servicing or test,
be sure to check the following ...
Inspection
1. INSPECT LOCK PLATE FOR DAMAGE
(a) Inspect the lock plate for damage.
HINT:
Reassembly of a deformed tank will be
impossible. Therefore, first correct the shape of
the lock plate groove with pliers or a similar tool,
if necessary.
Water leakage will result if the bottom of the lo ...
Throttle Actuator Control System
DESCRIPTION
The throttle actuator is operated by the ECM, and opens and closes the
throttle valve using the gears.
The opening angle of the throttle valve is detected by the Throttle Position
(TP) sensor, which is mounted
on the throttle body. The TP sensor provides feedback to the ECM ...