Output Diagnostic Test Mode

Output Diagnostic Test Mode

Note:
^ All functions which could previously be performed with Scan Tool VAG1551 can also be carried out with the Vehicle Diagnostic Testing and Information System VAS5051.

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 final control diagnosis for interchange or leaks.

Note:
^ 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 Scan Tool VAG1551 display during final control diagnosis:

(e.g. front left wheel, FL)

Final control diagnosis - 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

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

Hydr-P = Hydraulic pump

- Connect Scan Tool VAG1551.
- Switch ignition on.
- Press key 1 for "Rapid data transfer" operating mode.
- Select brake electronics control module (address word 03);.

Indicated on display:

Rapid data transfer Q
03 - Brake electronics

- Confirm entry with key Q.

During the next work steps the ABS Warning Lamp K47 flashes.

- Read off control module version in Scan Tool VAG1551 display.
- Press arrow right key.

Indicated on display

Rapid data transfer HELP
Enter address word XX

- Press keys 0 and 3

Indicated on display

Rapid data transfer Q
03 - Final control diagnosis

- Confirm entry with key Q.

ABS Hydraulic Pump V64 must run.

Indicated on display

Final control diagnosis - ->
ABS hydraulic pump V64

- Press arrow right key.

Indicated on display

Final control diagnosis - ->
Operate brakes

- Operate brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
IFL: VBAT OFL: 0V Wheel FL locked

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

ABS Hydraulic Pump V64 no longer runs.

Indicated on display

Final control diagnosis - ->
IFL: VBAT OFL: 0V Wheel FL free

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
Release brakes

- Remove foot from brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
Operate brakes

- Operate brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
IFR: VBAT OFR: 0V Wheel FR locked

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

ABS Hydraulic Pump V64 no longer runs.

Indicated on display

Final control diagnosis - ->
IFR: VBAT OFR: 0V Wheel FR free

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
IFR: 0V OFR: 0V Wheel FR locked

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

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 arrow right key.

Indicated on display

Final control diagnosis - ->
Release brakes

- Remove foot from brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
Operate brakes

- Operate brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
IRL: VBAT ORL: 0V Wheel RL locked

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

ABS Hydraulic Pump V64 no longer runs.

Indicated on display

Final control diagnosis - ->
IRL: VBAT ORL: 0V Wheel RL free

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
Release brakes

- Remove foot from brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
Operate brakes

- Operate brake pedal.
- Press arrow right key.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
IRR: VBAT ORR: 0V Wheel RR locked

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

ABS Hydraulic Pump V64 no longer runs.

Indicated on display

Final control diagnosis - ->
IRR: VBAT ORR: 0V Wheel RR free

- Press arrow right 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.

Indicated on display

Final control diagnosis - ->
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 arrow right key.

Indicated on display

Final control diagnosis - ->
Release brakes

- Remove foot from brake pedal.
- Press arrow right key.

Indicated on display (vehicles with EDL)

Final control diagnosis - ->
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.

- Press arrow right key.

ABS Warning Lamp K47 goes out.

Indicated on display

Function is unknown or ->
cannot be carried out at the moment

The final control diagnosis is completed

- Press arrow right key.

Indicated on display

Rapid data transfer HELP
Enter address word XX

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

- End output (Function 06).