INTAKE AND EXHAUST – On-vehicle Service
15-4
3. WASTEGATE ACTUATOR CHECK
(1) Connect a hand pump (pressure type) to the nipple.
(2) Gradually increase the pressure being applied to check
for the pressure at which the wastegate actuator rod starts
moving (approx. 1 mm stroke).
Standard value: Approx. 100 kPa {1.02 kg/cm
2
}
Caution
Do not apply a pressure more than 120 kPa {1.23
kg/cm
2
} to prevent the diaphragm from being
damaged.
(3) If the pressure drastically deviates from the standard
value, check the actuator or wastegate valve and, if
necessary, replace the actuator or turbocharger assembly.
4. WASTEGATE SOLENOID VALVE CHECK
4-1 OPERATION CHECK
(1) Connect a hand vacuum pump to nipple A of the solenoid
valve.
(2) Using jumper wires, connect the solenoid valve terminal
to battery terminals.
(3) Disconnecting and reconnecting the jumper wire on the
(–) terminal side, apply vacuum to check for airtightness.
Jumper wire Nipple B condition Normally
Connected Open Vacuum leaks.
Plugged Vacuum retained.
Disconnected Open Vacuum retained.
4-2 COIL RESISTANCE CHECK
Measure the resistance across solenoid valve terminals.
Standard value: 62 – 74 Ω (at 20_C)
5. AIR BYPASS VALVE CHECK
(1) Remove the air bypass valve.
(2) Connect a hand vacuum pump to the air bypass valve
nipple.
(3) Apply a vacuum of approx. 45 kPa {340 mmHg} and
check that the valve is airtight.
(4) Increase the vacuum and check for valve operation.
Vacuum Valve operation
Approx. 53 kPa {400 mmHg} Starts moving
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