Brake Vacuum Pump -V192-

Checking brake vacuum pump -V192-
Special tools and equipment





^ VAS 5051 Vehicle diagnosis, testing and information system
^ Diagnosis cable VAS 5051/1 or VAS 5051/3

Work sequence
^ With ignition switched off, connect tester VAS 5051 to diagnosis cable VAS 5051/1 or VAS 5051/3.





^ Switch on tester -arrow-.
Now the tester requires approximately 3 minutes to warm up.
^ Switch on ignition.
^ Select mode of operation: press button on touch screen for "On Board Diagnostic (OBD)".
^ Select vehicle system: select "01 - Engine electronics" on display.
The control module identification and the coding are indicated in the upper right-hand corner of the display.
^ Select diagnostic function: at this point, all diagnostic functions are available.
^ Select "04 - Basic setting" on the display.
^ Press keys 0, 0 and 8
^ Confirm entry with key Q.
Displayed on the screen:





^ Depress brake pedal hard several times in concession until the test is activated.
Displayed on the screen:





Once test has commenced, do not depress brake pedal.
The brake vacuum pump -V1 92- generates a vacuum in the brake servo. At the same time the brake servo system diagnosis runs in the control unit.
The test result is positive, if the pressure in the brake servo reaches the limit at which it cuts out within the time prescribed.
Displayed on the screen:





^ Quit or end the mode of operation via the "jump" button.

If the pressure in the brake servo does not reach the limit at which it cuts out within the time prescribed from the diagnosis, the test result is negative.
Displayed on the screen:





^ Perform "guided fault finding" with VAS 5051.