Variable Induction Position Sensor: Testing and Inspection

Intake Flap Vacuum Actuator, Checking

Only perform test if there were complaints about reduced torque, elasticity or engine power.

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213)

Work procedure

- Start engine.

- Accelerate abruptly and observe linkage on back side of vacuum actuator when doing so.

• Linkage must move - arrow -.





- If linkage on vacuum actuator does not move, check the following:

• Vacuum system for leaks,

• Change over mechanism linkage for ease of movement,

• Vacuum hoses for correct connection,

• Vacuum hoses for leaks.

- If no malfunctions are found, remove vacuum hose on vacuum actuator.





- Connect hand vacuum pump (VAS 6213) to vacuum actuator connector - arrow - as shown in illustration.

- With hand vacuum pump, create vacuum and observe vacuum actuator linkage.





• Linkage must move - arrow -.

- Vent hand vacuum pump.

• Linkage must move back into output position.

• Check linkage movement sequence over entire adjustment range: it must move continuously without jerking.

- If linkage on vacuum actuator does not move or moves jerkily, replace actuator.