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Home >> Volkswagen >> 2008 >> New Beetle Convertible (1Y7) L5-2.5L (BPS) >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Function 03 - Output Diagnostic Test Mode

Function 03 - Output Diagnostic Test Mode



Function 03 - Output Diagnostic Test Mode

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

Output Diagnostic Test Mode (DTM) allows you to check the function of the hydraulic system and the pump motor for incorrect connections or leaks (brake line connections to brake calipers and function of hydraulic valves).

Note:
^ The vehicle must be raised until all wheels are free to turn. A second technician is required to rotate wheels.
^ The C button 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. For this reason, more pressure must be applied to the brake pedal in order to attain the same braking effect.
^ When the vacuum in the brake booster is exhausted the wheels may not lock. Start the engine briefly to build up vacuum in the brake booster.

Example of Scan Tool VAG1551 display during output DTM (left-front wheel, FL shown in example):

Indicated on display

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

IFL: Inlet valve Front Left

VBAT: Battery voltage at valve

OFL: Outlet valve Front Left

0V: 0 Volts (no voltage at valve)

Locked/free: Wheel condition; must be checked by second technician

Indicated on display

Output Diagnostic Test Mode ->
EDL valves/Hyd-P:VBAT WhFL/FR locked

Hydr-P: Hydraulic pump

- Connect Scan Tool VAG1551.
- Switch ignition on.
- Press button 1 for "Rapid data transfer" operating mode.
- Press buttons 0 and 3 to insert "Brake Electronics" address word 03.

Indicated on display

- Press Q button to confirm input.

Note:
^ During the next procedure steps ABS Warning Lamp K47 flashes.

- Read control module version in Scan Tool VAG 1551 display.
- Press arrow right button.

Indicated on display

Rapid data transfer HELP
Select function XX

- Press buttons 0 and 3 to select "Output Diagnostic Test Mode" function 03.

Indicated on display

Rapid data transfer Q
03 - Output Diagnostic Test Mode

- Press Q button to confirm input.

ABS hydraulic pump display group number: must run.

Indicated on display

Output Diagnostic Test Mode ->
ABS hydraulic pump V64

- Press arrow right button.

Indicated on display

Output Diagnostic Test Mode ->
Operate brakes

- Operate brake pedal.
- Press arrow right button.

Indicated on display

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

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

- Press arrow right button.

ABS hydraulic pump display group number: 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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel locks it is possible that the brake lines to the wheel calipers have been interchanged.

- Press arrow right button.

ABS Hydraulic Pump V64 display group number no longer runs.

Indicated on display

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

- Press arrow right button.

Brake pedal must give noticeably.

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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

Output Diagnostic Test Mode ->
Release brakes

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

Indicated on display

Output Diagnostic Test Mode ->
Operate brakes

- Operate brake pedal.
- Press arrow right button.

Indicated on display

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

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

- Press arrow right button.

ABS Hydraulic Pump V64 display group number: 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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel locks it is possible that the brake lines to the wheel calipers have been interchanged.

- Press arrow right button.

ABS Hydraulic Pump V64 display group number no longer runs.

Indicated on display

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

- Press arrow right button.

Brake pedal must give noticeably.

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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

Output Diagnostic Test Mode ->
Release brakes

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

Indicated on display

Output Diagnostic Test Mode ->
Operate brakes

- Operate brake pedal.
- Press arrow right button.

Indicated on display

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

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

- Press arrow right button.

ABS Hydraulic Pump V64 display group number: 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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel locks it is possible that the brake lines to the wheel calipers have been interchanged.

- Press arrow right button.

ABS Hydraulic Pump V64 display group number no longer runs.

Indicated on display

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

- Press arrow right button.

Brake pedal must give noticeably.

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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

Output Diagnostic Test Mode ->
Release brakes

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

Indicated on display

Output Diagnostic Test Mode ->
Operate brakes

- Operate brake pedal.
- Press arrow right button.

Indicated on display

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

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

- Press arrow right button.

ABS hydraulic pump display group number: 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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel locks it is possible that the brake lines to the wheel calipers have been interchanged.

- Press arrow right button.

ABS hydraulic pump display group number: no longer runs.

Indicated on display

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

- Press arrow right button.

Brake pedal must give noticeably.

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

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

- Indicate to second technician which wheel requires turning by hand.

If the wheel does not lock, a malfunction may exist in the mechanical and/or hydraulic section of the brake system.

- Press arrow right button.

Indicated on display

Output Diagnostic Test Mode ->
Release brakes

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

Indicated on display (vehicles with EDL)

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

A second technician is required to rotate the respective wheel by hand.

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

- Press arrow right button.

ABS Warning Lamp K47 goes out.

Indicated on display

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

Output Diagnostic Test Mode (DTM) is completed.

- Press arrow right button.

Indicated on display

Rapid data transfer HELP
Select function XX

Note:
^ If ABS warning lamp does not go out there is a malfunction in the system.
^ Adhere exactly to the test sequence: first check DTC memory, then erase.

- End Output (scan tool function 06).

Data Bus Wiring, Checking

Display group number 125
- Press keys 1, 2 and 5
- Confirm entry with key Q.

There are always 4 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 4 can be read from the following tables.

Read measured value block 125 ->
-> 1 -> 2 -> 3 -> 4

Indicated on display: (vehicle stationary)

Read measured value block 125 ->
Engine 1 4WD 1 Gear. 1

Press C key for the next display group number entry.

If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.




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