Output Diagnostic Test Mode (DTM)

WARNING: This page is about a different variant/trim than selected.

NOTE:

All functions which could previously be performed with V.A.G 1551 can now also be carried out 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 it can happen that the wheels do not lock; start engine and build-up vacuum in brake booster.

Example:

Indicated on V.A.G 1551 display during Output 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

Connect V.A.G 1551 scan tool.
Switch on ignition.
Press key -1- for "Rapid data transfer" operating mode.
Select brake electronics control module (address word 03);. Refer to V.A.G 1551 scan tool, connecting and selecting function .

Indicated on display:

Rapid data transfer Q
03 - Brake electronics

Confirm entry with key Q.

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

Read off control module version in V.A.G 1551 display.
Press → key.

Indicated on display

Rapid data transfer HELP
Select function XX

Press keys 0 and 3

Indicated on display

Rapid data transfer Q
03 - Output Diagnostic Test Mode

Confirm entry with key Q.

ABS hydraulic pump -V64- must run.

Indicated on display

Output Diagnostic Test Mode - →
ABS hydraulic pump - V64

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Operate brakes

Operate brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IFL: 0V OFL: 0V Wheel FL locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IFL: VBAT OFL: 0V Wheel FL locked

Press → key.

ABS hydraulic pump -V64- must run.

Brake pedal must not give.

If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IFL: VBAT OFL: VBAT Wheel FL free

Indicate to 2nd mechanic which wheel requires turning by hand.

NOTE: If the wheel locks there is a possibility that the brake lines to the wheel calipers/cylinders have been interchanged.

Press → key.

ABS hydraulic pump -V64 no longer runs.

Indicated on display

Output Diagnostic Test Mode - →
IFL: VBAT OFL: 0V Wheel FL free

Press → key.

Brake pedal must give perceptibly

If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IFL: 0V OFL: 0V Wheel FL locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Release brakes

Remove foot from brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Operate brakes

Operate brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IFR: 0V OFR: 0V Wheel FR locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IFR: VBAT OFR: 0V Wheel FR locked

Press → key.

ABS hydraulic pump -V64- must run.

Brake pedal must not give

If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IFR: VBAT OFR: VBAT Wheel FR free

Indicate to 2nd mechanic which wheel requires turning by hand.

NOTE: If the wheel locks there is a possibility that the brake lines to the wheel calipers/cylinders have been interchanged.

Press → key.

ABS hydraulic pump -V64- no longer runs.

Indicated on display

Output Diagnostic Test Mode - →
IFR: VBAT OFR: 0V Wheel FR free

Press → key.

Brake pedal must give perceptibly

If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IFR: 0V OFR: 0V Wheel FR locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Release brakes

Remove foot from brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Operate brakes

Operate brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IRL: 0V ORL: 0V Wheel RL locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IRL: VBAT ORL: 0V Wheel RL locked

Press → key.

ABS hydraulic pump -V64- must run.

Brake pedal must not give

If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IRL: VBAT ORL: VBAT Wheel RL free

Indicate to 2nd mechanic which wheel requires turning by hand.

NOTE: If the wheel locks there is a possibility that the brake lines to the wheel calipers/cylinders have been interchanged.

Press → key.

ABS hydraulic pump -V64 no longer runs.

Indicated on display

Output Diagnostic Test Mode - →
IRL: VBAT ORL: 0V Wheel RL free

Press → key.

Brake pedal must give perceptibly

If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IRL: 0V ORL: 0V Wheel RL locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Release brakes

Remove foot from brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Operate brakes

Operate brake pedal.
Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IRR: 0V ORR: 0V Wheel RR locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
IRR: VBAT ORR: 0V Wheel RR locked

Press → key.

ABS hydraulic pump -V64- must run.

Brake pedal must not give

If the brake pedal gives, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IRR: VBAT ORR: VBAT Wheel RR free

Indicate to 2nd mechanic which wheel requires turning by hand.

NOTE: If the wheel locks there is a possibility that the brake lines to the wheel calipers/cylinders have been interchanged.

Press → key.

ABS hydraulic pump -V64 no longer runs.

Indicated on display

Output Diagnostic Test Mode - →
IRR: VBAT ORR: 0V Wheel RR free

Press → key.

Brake pedal must give perceptibly

If the brake pedal does not give, there is a malfunction in the hydraulic unit. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Indicated on display

Output Diagnostic Test Mode - →
IRR: 0V ORR: 0V Wheel RR locked

Indicate to 2nd mechanic which wheel requires turning by hand.

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.

Press → key.

Indicated on display

Output Diagnostic Test Mode - →
Release brakes

Remove foot from brake pedal.
Press → key.

Indicated on display (vehicles with EDL)

Output Diagnostic Test Mode - →
EDL valves/Hyd-P: VBAT Wh FL/FR locked

A 2nd mechanic is required to rotate the respective wheel by hand.

If the wheels do not lock, there is a malfunction in the hydraulic part of the ABS system. In this case the hydraulic unit must be replaced.

Refer to 45 ANTI-LOCK BRAKE SYSTEM

Press → key.

The ABS warning light -K47- goes out.

Indicated on display

Function is unknown or →
cannot be carried out at the moment

The final control diagnosis is completed

Press → key.

Indicated on display

Rapid data transfer HELP
Select function XX

NOTE:

There is a malfunction in the system if the ABS warning light -K47- does not go out.
Adhere exactly to test sequence: First check DTC memory, then erase.

End output (Function 06). Refer to Diagnostic Trouble Code (DTC) memory, erasing and ending output .

Refer to Output Diagnostic Test Mode (DTM)