Vacuum Pump: Testing and Inspection

Brake System Vacuum Pump, Checking

Special tools, testers and auxiliary items required

• Vehicle Diagnosis, Testing and Information System (VAS 505x)

Procedure

- Connect the (VAS 505x) to the diagnostic connector with the ignition switched off.

- Switch the tester on - arrow -.





The tester will now require up to 3 minutes to boot up.

- Switch on ignition

- Select operating mode: On the display, select "Vehicle On-Board Diagnostic".

- Select vehicle system: Select "engine electronics" on the display.

At the upper right of the screen, the control module identification and coding are displayed.

- Select diagnostic function: At this point, all diagnostic functions are available.

- Select "006 - Basic setting".

- Press buttons 0, 1 and 1.

- Confirm the input with the Q button.

Displayed at the bottom of the screen:






- Actuate the brake pedal multiple times with consistent force until the test activates.

Displayed at the bottom of the screen:






The brake pedal may no longer be actuated once the test begins.

The brake system vacuum pump (V192) supplies the brake booster with vacuum. At the same time, the control module performs a diagnosis of the brake booster system.

If the pressure within in the brake booster reaches the cut-off threshold by the time that was predetermined by the diagnostic function, the test has been passed.

Displayed at the bottom of the screen:






- Using the Go to button, the operating mode can be interrupted or ended.

If the pressure within in the brake booster does not reach the cut-off threshold by the time that was predetermined by the diagnostic function, the test has been failed.

Displayed at the bottom of the screen:






- Perform Guided Fault Finding with the (VAS 505x).