Turbocharger Pressure Control Test

Turbocharger Control System Test:

Note: If any self diagnostic codes have set, or if any further diagnostics are planned, read all codes before performing this test.

1. Disconnect the vacuum (white striped) hose from the wastegate actuator, and connect a hand vacuum pump to the hose.
2. Disconnect the vacuum (black) hose from the intake port (A in the illustration) that controls the actuator. Insert a plug in the intake port fitting.
3. Disconnect the negative terminal of the battery for at least 10 seconds, then reconnect the terminal.
4. Apply a vacuum with the hand pump and verify that vacuum leaks down. If vacuum does not leak down remove and inspect the inline orifice for blockage. If the orifice is blocked, replace the module. If the orifice is not blocked inspect the lines for blockage.
5. Block the end of the intake port end of the (black) hose and apply vacuum. Vacuum should hold.
6. Start and idle the engine. Repeat the test performed in step number 5. Vacuum should leak down.
7. Turn off the ignition.

Detonation Sensor Connector:

8. Locate and disconnect the detonation sensor.
9. Restart the engine and apply vacuum, vacuum should hold.
10. Turn off the ignition and reconnect the detonation sensor
11. Disconnect the negative terminal of the battery for at least 10 seconds, then reconnect the terminal.