Volkswagen Golf / Golf GTI / Jetta. Manual — part 353

01-74

Output Diagnostic Test Mode (DTM)

Note:

All functions which could previously be

performed with V.A.G 1551 can also be
performed with the tester VAS 5051.

The pump motor and the correct functioning of

the hydraulic circuits (allocation of brake lines to
wheel cylinders and function of valves) can be
checked via the output DTM for interchange or
leaks.

The vehicle must be raised until all wheels are

free to turn. (2nd mechanic required to rotate
wheels)

The -C- key can be used to exit the test

sequence at any time.

After depressing the brake pedal several times

the vacuum in the brake booster will be
exhausted. Therefore more pressure must be
applied to the brake pedal in order to attain the
same fluid pressure in brake system, as that
attained with vacuum.

When vacuum in brake booster is exhausted

wheels may not lock; start engine and build-up
vacuum in brake booster.

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

01-75

Example:

Indicated on V.A.G 1551 display during

output Diagnostic Test Mode (DTM):

(e.g. front left wheel, FL)

Output Diagnostic Test Mode -

IFL: VBAT OFL: 0V Wheel FL locked

IFL = Inlet valve Front Left

VBAT = Voltage Battery; Voltage at valve

OFL = Outlet valve Front Left

0V = 0 Volt; No voltage at valve

Locked/free = Wheel condition; must be

checked by 2nd mechanic if required

Output Diagnostic Test Mode -

EDL valves/Hyd-P: VBAT Wheel FL/FR
locked

Hydr-P = Hydraulic pump

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

01-76

- Connect V.A.G 1551 Scan Tool.

- Switch ignition on.

- Press key -1- for "Rapid data transfer" operating

mode.

- Select brake electronics (address word 03);

Page 01-23

Rapid data transfer

Q

03 - Brake electronics

Indicated on display

Note:

During the next work steps the ABS warning light -
K47- flashes.

- Confirm entry with key Q.

- Read off control module version in V.A.G 1551

display.

- Press

key.

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

01-77

Rapid data transfer

HELP

Select function XX

Indicated on display

- Press keys 0 and 3

Rapid data transfer

Q

03 - Output Diagnostic Test Mode

Indicated on display

- Confirm entry with key Q.

ABS hydraulic pump -V64- must

run.

Output Diagnostic Test Mode

-

ABS hydraulic pump - V64

Indicated on display

- Press

key.

Output Diagnostic Test Mode

-

Operate brakes

Indicated on display

- Operate brake pedal.

- Press

key.

Output Diagnostic Test Mode

-

IFL: 0V OFL: 0V

Wheel FL locked

Indicated on display

Note:

If the wheel does not lock, there is a
possibility that there is a malfunction
in the mechanical/hydraulic part of
the brake system.

- Indicate to 2nd mechanic which

wheel requires turning by hand.

ABS ITT Mk 20 IE On Board Diagnostic (OBD) program