INTAKE AND EXHAUST -
On-vehicle Service
15-5
NOTE
(1) If the variable geometry actuator vacuum is not in a normal
condition, the variable geometry actuator, variable
geometry solenoid valve, variable geometry control
pressure sensor, vacuum pump or hose may be faulty.
(2) If the variable geometry actuator vacuum is in a normal
condition but the supercharging pressure is not in a normal
condition, the variable geometry turbocharger nozzle,
boost pressure sensor, or hose may be faulty.
Caution
Be careful not to forcibly activate the variable geometry
solenoid valve to the fullest degree when running at a
high speed. Too much supercharging pressure could
damage the engine or the turbocharger.
VARIABLE GEOMETRY ACTUATOR CHECK
1. Connect the hand vacuum pump to nipple.
2. While gradually applying vacuum, check the vacuum that
begins to active (approximately 1 mm stroke) the variable
geometry actuator rod.
Standard value: Approximately 10.5 - 12.5 kPa
Caution
In order to avoid damage to the diaphragm, do not apply a
vacuum of 59 kPa or higher.
3. If there is a significant deviation from the standard value,
check the actuator or the variable nozzle: replace if
necessary.
VARIABLE GEOMETRY SOLENOID VALVE
CHECK
NOTE
When disconnecting the vacuum hose, always make a mark
so that it can be reconnected at original position.
1. Disconnect the vacuum hose (black, red stripe) from the
solenoid valve.
2. Disconnect the harness connector.
3. Connect a hand vacuum pump to the nipple to which
the red striped vacuum hose was connected.
4. Check airtightness by applying a vacuum with voltage
applied directly from the battery to the variable geometry
solenoid valve and without applying voltage.
Variable geometry
actuator
Battery
B
C
A
