Variable Induction Control Module: Testing and Inspection

Intake Manifold Flap Vacuum Actuator, Checking

• The test must only be performed if torque loss is present, meaning if there is reduced elasticity or reduced engine torque.

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213) or hand vacuum pump (VAG 1390)

Conditions

• The Intake Manifold Tuning (IMT) valve was checked with the ( VAS 5051B) in "Guided Fault Finding".

Test Sequence

If the IMT valve is OK:

- Start the engine and let run at idle.

- Have a 2nd person increase the engine speed abruptly (press the accelerator pedal). Observe the variable intake manifold vacuum actuator.





• The actuator must switch.

If the change over does not function as specified:

- Check whether the vacuum system, including the vacuum reservoir in the intake manifold, is properly sealed.

- Check whether the change over mechanism moves easily. Do this by actuating the linkage by hand.

- Check whether the vacuum lines are correctly connected.

- Check that the vacuum hoses are not porous.

If no malfunction was found:

- Remove the air filter. Refer to => [ Air Filter Assembly Overview ] Removal and Replacement.

- Disconnect the vacuum hose from the vacuum actuator.

- Connect the (VAS 6213) to the vacuum actuator.





- Operate the (VAS 6213) several times.

• The operating plunger must move.

- Disconnect the (VAS 6213) from the vacuum actuator.

• Operating plunger must spring back into its initial position.

If operating plunger does not move as described:

- Replace the vacuum actuator.