Volkswagen Golf / Golf GTI / Jetta. Manual — part 481

47-66

Test step overview

To test component

Resistance of -V192- brake system vacuum pump

- Perform test
step 1

Communication signal of engine control unit to -V192- brake system
vacuum pump

- Perform test
step 2

Voltage supply of ignition/starter switch to -V192- brake system
vacuum pump

- Perform test
step 3

Resistance of connection of ignition/starter switch to -V192- brake
system vacuum pump

- Perform test
step 4

Resistance of connection of battery to -V192- brake system vacuum
pump

- Perform test
step 5

Voltage supply of Battery to -V192- brake system vacuum pump

- Perform test
step 6

Brake booster/brake master cylinder for vehicles with ABS/EDL/ASR/ESP Mark...

47-67

Test table (test steps 1 - 6)

Notes on test table

The socket designations of adapter VAG 1598/31 (for test step 2) are identical to the

engine control module contact designations in wiring diagram.

Electrical Wiring Diagrams, Troubleshooting & Component Locations binder

If the readings obtained deviate from the specifications, carry out repair measure in

the right-hand part of the table.

Electrical Wiring Diagrams, Troubleshooting & Component Locations binder

If the measured figures only deviate slightly from the specifications, clean sockets

and plugs of the testers and adapter cables (with contact spray G 000 700 04 ) and
repeat check. Before replacing components, check wiring and connections and also,
particularly for specifications of less than 10

, repeat resistance check on the

component.

Brake booster/brake master cylinder for vehicles with ABS/EDL/ASR/ESP Mark...

47-68

Switch to measuring range:

Resistance measurement (

)

Test

step

Contact

Item tested

Test

conditions

Specification Measures for

deviations from
specification

1

1 +

Ground

Resistance of -
V192- brake
system vacuum
pump

Ignition

switched
off

5.0...5.3

Electrical

Wiring Diagrams,
Troubleshooting
& Component
Locations binder

- Check wiring
using wiring
diagram

2

2 + pin

22

Communication
signal of engine
control unit to -
V192- brake
system vacuum
pump

Ignition

switched
off

0.0...0.1

Electrical

Wiring Diagrams,
Troubleshooting
& Component
Locations binder

- Check wiring
using wiring
diagram

Brake booster/brake master cylinder for vehicles with ABS/EDL/ASR/ESP Mark...

47-69

Switch to measuring range:

Voltage measurement (20 V =)

Test

step

Contact

Item tested

Test

conditions

Specification Measures for

deviations from
specification

3

3 + 1

Voltage supply
from
ignition/starter
switch to -V192-
brake system
vacuum pump

Ignition

switched
on

12.0...12.60 V

(approx.

battery

voltage)

Electrical

Wiring Diagrams,
Troubleshooting
& Component
Locations binder

- Check wiring
using wiring
diagram

Brake booster/brake master cylinder for vehicles with ABS/EDL/ASR/ESP Mark...