Toyota Sienna Service Manual: For vehicles equipped with traction control (trac) system
When using a 2-wheel drum tester such as a speedometer tester or chassis dynamometer, etc., or jacking up the front wheels and driving the wheels, always push in the TRAC cut ("TRAC OFF") switch and turn the TRAC system OFF.
FOR VEHICLES EQUIPPED WITH TRACTION CONTROL (TRAC) SYSTEM
(a) Confirm TRAC system is OFF
(1) Press the TRAC cut ("TRAC OFF") switch.
(2) Check that the TRAC OFF indicator light comes on when the TRAC system is turned OFF by the TRAC cut switch.
HINT:
The SLIP indicator light should always operate right after the engine is restarted.
(3) Begin measurements.
(4) Press the TRAC cut switch to turn the TRAC to the operative mode and check that the TRAC OFF indicator light goes off.
HINT: The SLIP indicator light blinks when the TRAC system in operating.
The SLIP indicator light should always operate right after the engine is
restarted.
When 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
...
For vehicles equipped with vehicle stability control (vsc) system
(a) Notices when using drum tester
Notices when using drum tester.
(1) When using a drum tester, be sure to start the
engine with the ignition switch OFF, and connect
SST to the terminals TS ...
Other materials:
Mass or Volume Air Flow Circuit/ Mass or Volume Air Flow Circuit Low Input/
Mass or Volume Air Flow Circuit High Input
DESCRIPTION
The Mass Air Flow (MAF) meter is a sensor that measures the amount of air
flowing through the throttle
valve. The ECM uses this information to determine the fuel injection time and to
provide appropriate airfuel
ratio. Inside the MAF meter, there is a heated platinum wire which is ...
Approach warning
When your vehicle is too close to a vehicle ahead, and sufficient automatic
deceleration via the cruise control is not possible, the display
will flash and the buzzer will sound to alert the driver. An example of
this would be if another driver cuts in front of you while you are following
a vehi ...
Cold Start Idle Air Control System Performance
DESCRIPTION
This monitor will run when the engine is started at -10 to 50°C (14 to 122°F)
of the engine coolant
temperature. The DTC will set after the engine idling for 13 seconds (2 trip
detection logic).
The DTC is designed to monitor the idle air control at cold start. When the
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