Function 03 - Output Diagnostic Test Mode
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).
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 VAG 1551, CONNECTING AND SELECTING FUNCTIONS .
-- Switch ignition on.
-- Press button 1 for "Rapid data transfer" operating mode.
-- Press buttons 0 and 3 to insert "Brake Electronics" address word 03 VAG 1551, CONNECTING AND SELECTING FUNCTIONS .
Indicated on display
| Rapid data transfer Q 03 - Brake Electronics |
-- Press Q button to confirm input.
During the next procedure steps ABS Warning Lamp -K47- flashes.
-- Read control module version in Scan Tool VAG 1551 display.
-- Press→ 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→ button.
Indicated on display
| Output Diagnostic Test Mode -> Operate brakes |
-- Operate brake pedal.
-- Press→ 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→ button.
Indicated on display
| Output Diagnostic Test Mode -> IFL: VBAT OFL: 0V Wheel FL locked |
-- Press→ 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: Removal and Installation
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→ 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→ 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: Removal and Installation
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→ button.
Indicated on display
| Output Diagnostic Test Mode -> Release brakes |
-- Remove foot from brake pedal.
-- Press→ button.
Indicated on display
| Output Diagnostic Test Mode -> Operate brakes |
-- Operate brake pedal.
-- Press→ 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→ button.
Indicated on display
| Output Diagnostic Test Mode -> IFR: VBAT OFR: 0V Wheel FR locked |
-- Press→ 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: Removal and Installation
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→ 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→ 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: Removal and Installation
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→ button.
Indicated on display
| Output Diagnostic Test Mode -> Release brakes |
-- Remove foot from brake pedal.
-- Press→ button.
Indicated on display
| Output Diagnostic Test Mode -> Operate brakes |
-- Operate brake pedal.
-- Press→ 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→ button.
Indicated on display
| Output Diagnostic Test Mode -> IRL: VBAT ORL: 0V Wheel RL locked |
-- Press→ 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: Removal and Installation .
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→ 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→ 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: Removal and Installation
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→ button.
Indicated on display
| Output Diagnostic Test Mode -> Release brakes |
-- Remove foot from brake pedal.
-- Press→ button.
Indicated on display
| Output Diagnostic Test Mode -> Operate brakes |
-- Operate brake pedal.
-- Press→ 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→ button.
Indicated on display
| Output Diagnostic Test Mode -> IRR: VBAT ORR: 0V Wheel RR locked |
-- Press→ 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: Removal and Installation
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→ 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→ 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: Removal and Installation
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→ button.
Indicated on display
| Output Diagnostic Test Mode -> Release brakes |
-- Remove foot from brake pedal.
-- Press→ 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: Removal and Installation
-- Press→ 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→ button.
Indicated on display
| Rapid data transfer HELP Select function XX |
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) FUNCTION 06 - ENDING OUTPUT => Press buttons 0 and 6 to select "End Output" 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 → key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
| Read measured value block | 125 → | Display group number: 125 | ||||||||
| Engine 1 | AWD 1 | Gear. 1 | Indicated on display (example) | |||||||
| Vacant | ||||||||||
Data bus connection for transmission(1)
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Data bus for all-wheel drive(3)
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Data bus for engine
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Incorrect transmission control module or incorrect transmission control module coding.
Transmission control module faulty. Refer to Diagnosis and Testing or refer to[For transmission(s) 09G] Diagnosis, Testing and Information System VAS5051, Connecting and Selecting Function or refer to[For transmission(s) 09G] Diagnosis and Testing .