Brake system vacuum pump V192 , checking

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Special tools, testers and auxiliary items required

Fig 1: Identifying Vehicle Diagnosis, Testing And Information System VAS 5051

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Vehicle diagnostic, testing and information system VAS 5051
Diagnosis lead VAS 5051/1 or diagnosis lead VAS 5051/3

Procedure

With ignition switched off, connect vehicle diagnostic, testing and information system VAS 5051 to diagnostic connection with diagnosis lead VAS 5051/1 or diagnosis lead VAS 5051/3.

Fig 2: Special Tool - VAS 5051 & On Switch

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Switch on tester - arrow -.

The tester may need up to 3 minutes before it is ready for operation.

Switch on ignition.
Select mode: Press button on display for "Vehicle self-diagnosis".
Select vehicle system: Press button for "01 - Engine electronics".

The control module identification and coding will appear at top right of display.

Select diagnosis function (all diagnosis functions are available at this stage).
Select "04 - Basic setting" on display.
Press buttons 0 , 0 and 8.
Confirm entry with Q key.

The following information will appear at the bottom of the display:

Basic setting
	Not operated
	Pump off
	xxx mbar
	Test off

Firmly depress brake pedal several times in succession until test is activated.

The following information will appear at bottom of display:

Basic setting
	Not operated
	Pump on
	xxx mbar
	Test on

Do not press brake pedal again once test has been activated.

The Brake System Vacuum Pump V192 supplies vacuum to brake booster. The diagnosis of the brake booster system runs in the control module at the same time.

The system passes the test if the pressure in the brake booster reaches the shut-off threshold within time limit set by diagnostic function.

The following information will appear at bottom of display:

Basic setting
	Not operated
	Pump off
	xxx mbar
	Syst. OK

You can cancel or exit from this mode by pressing Go to button.

The system fails the test if pressure in brake booster does not reach shut-off threshold within time limit set by diagnostic function.

The following information will appear at bottom of display:

Basic setting
	Not operated
	Pump off
	xxx mbar
	Syst.n.OK

Follow "Guided Fault Finding" procedure using vehicle diagnostic, testing and information system VAS 5051.