Scan Tool Connecting
Test conditions
- Battery voltage at least 11 V
- Ground (GND) connections at engine and transmission OK
Procedure
- Connect VAS5051 tester to vehicle with VAS5051/1 diagnostic wire. Alternately, VAG 1551 Scan Tool can also be attached using VAG 1551/3 adapter.
Model Specific Warnings, Refer to "Scan Tool (ST) and Test Equipment Safety Precautions" Technician Safety Information
NOTE:
- The following description only explains implementation of On Board Diagnostic using VAG 1551 Scan tool.
- When using the VAS5051 tester observe the tester's instructions for use
Indicated on display
VAG - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer 1)
2 - Blink code output 1)
1) Operating modes 1 and 2 are displayed alternately
NOTE: If nothing appears in display
See Scan Tool operating instructions
Depending on desired function, see Table "Selectable functions,"
- Turn ignition on.
or
- Start engine.
- Turn printer of scan tool on using PRINT button. The lamp in the button must light up.
- Press button 1 to select "Rapid data transfer" operating mode 1.
When indicated on display
Rapid data transfer HELP
Insert address word XX
NOTE: The address word 00 initiates the automatic test sequence, i.e. it results in a DTC check on all OBD capable systems in the vehicle via rapid data transfer.
- Press buttons -0- and -1- to select address word "engine electronics" and press -Q- button to confirm input.
VAG 1551 Scan Tool display indicates control module identification, e.g.:
8N0906018C 1.81 R4/5VT G 0005 ->
coding 06500 WSC 12345
NOTE: Control module identification can be printed by pressing the PRINT button of the VAG 1551 scan tool.
Control module identification (example)
- 8N0906018C Part number allocation
- 1.8 Liter Engine displacement
- R4/5V T In-line engine 4 cylinder / 5 valve turbo
- "G" or no indication vehicle with or without cruise control (respectively)
- 0005 Data version (software version) of control module
- Coding 06500 coding of control module
- WSC 12345 Factory identification of VAG 1551, with which the last coding was performed
- Press -> button.
Indicated on display (function selection)
Rapid data transfer HELP
Select function XX
NOTE:
- After pressing buttons -0- and -1- to select "Check Control Module Versions" and pressing -Q- button to confirm input, you may also have control module identification displayed again.
- When indicated on display:
Rapid data transfer HELP
Control module does not answer
- Perform troubleshooting procedure:
Rapid data transfer HELP
K- wire not switching to Ground
Rapid data transfer HELP
K-wire not switching to B+
Rapid data transfer HELP
Error in communication link
Selectable Functions:
Modes under address word 33
- Mode 1: Transmit diagnostic data Switch ignition on or let engine run at idle
- Mode 2: Transmit operating Switch ignition on or let engine run at idle
conditions
- Mode 3: Check DTC Memory Switch ignition on or let engine run at idle
- Mode 4: Erase diagnostic data Switch ignition on or let engine run at idle
- Mode 5: Output of oxygen sensor Switch ignition on or let engine run at idle
signals
- Mode 6: Transmit measured values Switch ignition on or let engine run at idle
- Mode 7: Check DTC Memory Switch ignition on or let engine run at idle
- Modes 1 to 7 can be selected under address word 33.
- Individual measured values can be read out under mode 1. Mode 1 is not recommended for authorize Audi service stations, since this data can be obtained much more accurately under address word 01/function 04 or function 08.
- Mode 2 displays operating conditions, for which a malfunction was recognized.
- With mode 3, DTC memory is checked and with mode 4, DTC memory is erased.
- Mode 5 displays the static dimensions of the oxygen sensors, which are legally required. Since these dimensions are not directly relevant to oxygen sensor diagnostics, mode 5 is also insignificant for the authorized Audi service station.
- Under mode 6, all measured values can be checked from components and systems that are not constantly monitored.
- Using mode 7, DTCs can be checked for which the Malfunction Indicator Light (MIL) is not yet lit (MIL is not on, no DTCs under mode 3)