Wastegate Solenoid Valve Test

Wastegate Solenoid Valve, Location:

Note: The wastegate solenoid is spring loaded closed when not energized, after start-up the ECM fully grounds the circuit. It is only controlled by the ECM during failure mode.

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.

Note: 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 fitting the red striped hose was removed from.

Solenoid Operational Test:

4. 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.

Solenoid Resistance Check:

6. Measure the resistance between the two terminals of the solenoid valve.

RESISTANCE
36 - 46 ohm @68°F (20°C)