Air Injection Control Valve: Testing and Inspection

Air Control Valve (ACV) Switching Valve/
System operation




1. Connect the SST (Special Service Tool) (Engine Signal Monitor Adapter Harness) to the ECM (Engine Control Module) as shown.
2. Start the engine and run it at idle.




3. Short the ECM terminal 4N and verify that the engine condition changes (rough idle).
4. If the engine condition does not change check the following.
- Vacuum tube (Inspect the vacuum line fitting connections and components for leaks)
- Secondary air switching valve
- Air relief valve
- Air pump
- Air pump relay

Inspection
1. Remove the air control valve.




2. Connect a vacuum pump to port A.




3. Verify that the switching valve opens at a vacuum 14.7 kPa (110 mmHg, 4.3 inHg).


CAUTION:
Applying vacuum greater than 66.7 kPa (500 mmHg, 19.7 inHg) can damage the air control valve.

4. If not as specified replace air control valve.


Air Relief Valve
System operation
Engine Signal Monitor




1. Connect the SST (Engine Signal Monitor Adaptor Harness) to the ECM as shown.
2. Start the engine and run it at idle.




3. Verify that air DOES NOT flow from air relief valve.
4. Short the ECM terminal 3P and verify that the air DOES flow from air relief valve.
5. If the air does not flow, check the following.
- Vacuum tube (Inspect the vacuum line fitting, connections and components for leaks)
- Secondary air bypass valve
- Air pump
- Air pump relay

Inspection
1. Remove the air control valve.




2. Connect a vacuum pump to port A.




3. Verify that the air relief valve opens at a vacuum 19.3 kPa (145 mmHg, 5.7 inHg).

CAUTION:
Applying vacuum greater than 66.7 kPa (500 mmHg, 19.7 inHg) can damage the air control valve.

4. If not as specified, replace air control valve.

Removal/Installation
1. Remove the extension manifold.
2. Remove in the order shown in the figure.
3. Install in the reverse order of removal.




1. Turbo control solenoid valve
2. Air control valve
3. Gasket
4. Check valve (Port air)
5. Port air bypass solenoid valve
6. Split air bypass solenoid valve
7. Relief2 solenoid valve