Location of elements of the induction air supply system to the engine
The induction engine air supply system changes the direction of air flow in the intake manifold depending on the engine speed.
The system actuator is controlled by the vacuum created in the intake manifold.
1. To check the induction air supply system, install a tee with a pressure gauge between the control valve and the vacuum hose.
2. Start the engine at idle speed. In this case, the pressure gauge should not show vacuum.
3. Briefly depress the accelerator pedal fully. In this case, the pressure gauge should show a vacuum, and the thrust of the actuator should move.
4. If there is no vacuum, check the patency of the vacuum hose and the operation of the switching vacuum valve (VSV).
5. Check the condition of the vacuum reservoir by blowing air through it. When air is supplied to channel A, air must exit from channel B, and air must not pass in the opposite direction.
6. While creating a vacuum in the vacuum reservoir through port B, check with your finger that the vacuum in port A is maintained for at least 1 minute.
7. To check the switching vacuum valve, connect an ohmmeter to its contacts and measure the resistance, which should be in the range of 33-39 ohms.