Mirage L4-1597cc 1.6L DOHC Turbo (1989)
Wastegate Solenoid: Testing and Inspection
Waste Gate Solenoid
System Schematic
The wastegate solenoid is spring loaded closed when not energized, after start-up the ECU fully grounds the circuit. It is only controlled by the ECU
during failure mode.
To test the operation of the wastegate solenoid, proceed as follows.
1. Connect a voltmeter to the ground side of the solenoid and start engine.
2. You should immediately after start up, measure approximately 12 Volts that drops to 0 Volts after a few seconds. From that point on the voltage
should remain at 0 unless, there is a malfunction in the detonation sensor or the air flow sensor, in which case the voltage from the negative side will
increase (duty cycle) and allow the solenoid to close and open the wastegate and lower the boost.
To induce a malfunction you can disconnect the detonation sensor and observe the voltage change from 0 up to 14 volts.
SOLENOID TEST
1.
Mark and disconnect the vacuum hose (black with red stripe) from the solenoid valve.
2.
Disconnect the electrical harness connector.
3.
Connect a manual vacuum pump to the nipple the red striped hose was removed from.
4.
Attempt to apply a vacuum while voltage is applied to the solenoid valve, verify that the valve does not hold vacuum.
5.
Remove power from the solenoid valve and verify that the solenoid valve holds vacuum.
6.
Measure the resistance between the two terminals of the solenoid valve, and verify that the resistance is between 36 and 44 ohms at 20 degrees C
(68 degrees F).