On-Vehicle Inspection; Check Throttle Valve (Low Altitude Area); Check Throttle Valve (High Altitude Area); Intake Venturi System (Ln 2L-T Only - Toyota 2L-T Repair Manual

EM-30
ENGINE MECHANICAL
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Intake Venturi System (LN 2L-T only)
INTAKE VENTURI SYSTEM
(LN 2L-T only)
ON-VEHICLE INSPECTION
NOTICE: Always stop the engine when installing or re-
moving the vacuum gauges, or removing the vacuum hoses.
(Austria)
PREPARATION
Using two 3-way connectors, connect two vacuum gauges
to hoses between the actuator and VSV.
CHECK THROTTLE VALVE (LOW ALTITUDE AREA)
HINT: Perform this check a t an altitude below 800 m
(2,600 ft) and a t an atmospheric pressure above 700
mm Hg (94.5 kg/cm2).
Start the engine and check that vacuum operates on
diaphragm chamber
B
so that the rods are pulled up.
Check that when the accelerator pedal is depressed,
atmospheric air operates on both diaphragm cham-
bers so that the rods return.
Check that when the starter switch is turned OFF
(engine stopped) from idling condition, vacuum
operates on both diaphragm chambers so that the
rods are pulled up.
Check that after the starter switch i s turned OFF, the
rods gradually return.
CHECK THROTTLE VALVE (HIGH ALTITUDE AREA)
HINT: Perform this check a t an altitude above 800 m
(2,600 ft) and a t an atmospheric pressure below 690
mm Hg (93.2 kg/cm2).
Check that during idling or with the starter switch OFF
(engine stopped), vacuum i s not operating on either
diaphragm chamber.