Variable Induction System: Testing and Inspection

ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS) - ON-VEHICLE INSPECTION
1. CONNECT VACUUM GAUGE.
- Using a 3-way connector, connect vacuum gauge to the hose between the actuator and Vacuum Switching Valve (VSV).

2. START ENGINE.




3. INSPECT INTAKE AIR CONTROL VALVE.
- While the engine is idling, check that the vacuum gauge needle does not move.




- Rapidly depress the accelerator pedal to fully open position and check that the vacuum gauge needle momentarily fluctuates approx. 33.3 kPa (250 mm Hg, 9.84 in.Hg) or more. (The actuator rod is pulled down.)

4. REMOVE VACUUM GAUGE.
- Remove the vacuum gauge, and reconnect the vacuum hoses to their proper locations.

NOTE: If no problem is found during this inspection, system is normal; otherwise inspect each part.




ACIS PARTS INSPECTION
1. INSPECT INTAKE AIR CONTROL VALVE.
- With 53.3 kPa (400 mmHg. 15.75 in.Hg) of vacuum applied to the actuator, check that the actuator rod moves.




- If operation is not as specified, turn the adjusting screw.
- One minute after applying the vacuum in (a), check that the actuator rod does not return.




2. INSPECT VACUUM TANK.
- Check that air flows from port A to B.
- Check that air does not flow port B to A.




- Plug port B with your finger, and apply 53.3 kPa (400 mmHg, 15.75 in.Hg) of vacuum to port A, and check that there is no change in vacuum after 1 minute.
- If operation is not as specified, replace the vacuum tank.




3. INSPECT VSV.
- Remove VSV and inspect for open circuit.
- Using an ohmmeter, check that there is continuity between the terminals.

Resistance: At 20°C (68° F): 27 - 33 Ohms)

- If there is no continuity, replace the VSV.




- Inspect VSV for ground.
- Using an ohmmeter, check that there is no continuity between each terminal and the body.
- If there is continuity, replace the VSV.




- Inspect VSV operation.
- Check that air does not flows from port E to F.




- Apply battery voltage across the terminals.
- Check that air flows from port E to F.
- If operation is not as specified, replace the VSV.