Testing brake vacuum pump V192 — VW

Testing
brake vacuum pump
V192
Special tools and workshop equipment required
Vehicle diagnosis, testing and information system
VAS 5051
Diagnosis cable
VAS 5051/1
or
diagnosis cable
VAS 5051/3
Work sequence
Connect
vehicle diagnosis, testing and information system
VAS 5051
to diagnostic interface in vehicle using
diagnosis cable
VAS 5051/1
or
diagnosis cable
VAS 5051/3
with ignition switched off.
Switch on tester
arrow
.
Now the tester requires approx. 3 minutes to run up.
Switch on ignition.
Select operating mode: Press the
“Vehicle self-diagnosis”
button on the display.
Select vehicle system: Select
“01 - Engine electronics”
on the display.
The control unit 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 buttons
0
,
0
and
8
.
Acknowledge entry with the
Q
button.
Displayed at the bottom of the screen:
Basic setting
Not operated
Pump off
xxx mbar
Test off
Depress brake pedal hard several times in concession until the test is activated.
Displayed at the bottom of the screen:
Basic setting
Not operated
Pump on
xxx mbar
Test on
Do not depress brake pedal once test has commenced.
The
vacuum pump for brakes
V192
generates a vacuum in the brake servo. Brake servo system diagnosis runs in parallel in the control unit.
If the pressure in the brake servo reaches the cut-out threshold within the time prescribed by the diagnostic function, the test result is positive.
Displayed at the bottom of the screen:
Basic setting
Not operated
Pump off
xxx mbar
Syst. OK
Quit or end the operating mode via the
jump
button.
If the pressure in the brake servo does not reach the cut-out threshold within the time prescribed by the diagnostic function, the test result is negative.
Displayed at the bottom of the screen:
Basic setting
Not operated
Pump off
xxx mbar
Syst. not OK
Carry out
“guided fault finding”
with the
vehicle diagnosis, testing and information system
VAS 5051
.