Wastegate Actuator Check; Wastegate Solenoid Valve Check; Air Bypass Valve Check - Mitsubishi Lancer Evolution-IV Workshop Manual

15-4
INTAKE AND EXHAUST –

3. WASTEGATE ACTUATOR CHECK

(1) Connect a hand pump (pressure type) to the nipple.
(2) Gradually increase the pressure being applied to check
(3) If the pressure drastically deviates from the standard

4. WASTEGATE SOLENOID VALVE CHECK

4-1 OPERATION CHECK
(1) Connect a hand vacuum pump to nipple A of the solenoid
(2) Using jumper wires, connect the solenoid valve terminal
(3) Disconnecting and reconnecting the jumper wire on the
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
(3) Apply a vacuum of approx. 45 kPa {340 mmHg} and
(4) Increase the vacuum and check for valve operation.
On-vehicle Service
for the pressure at which the wastegate actuator rod starts
moving (approx. 1 mm stroke).
Standard value: Approx. 100 kPa {1.02 kg/cm
Caution
Do not apply a pressure more than 120 kPa {1.23
2
kg/cm } to prevent the diaphragm from being
damaged.
value, check the actuator or wastegate valve and, if
necessary, replace the actuator or turbocharger assembly.
valve.
to battery terminals.
(–) terminal side, apply vacuum to check for airtightness.
Jumper wire Nipple B condition
Connected Open
Plugged
Disconnected Open
nipple.
check that the valve is airtight.
Vacuum
Approx. 53 kPa {400 mmHg}
2
Normally
Vacuum leaks.
Vacuum retained.
Vacuum retained.
Valve operation
Starts moving
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