Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURES5 SPEED AUTOMATIC 01V FWDSCAN TOOL CONNECTING AND INITIAL CHECKSCONNECTING VAG 1551 SCAN TOOL
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Connecting VAG 1551 Scan Tool
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Connecting VAG 1551 Scan Tool
VAG 1551, Connecting And Selecting Function
NOTE: The VAG 1552 scan tool can be used instead of the VAG 1551, however no printout is possible.
Test requirements
- Battery Positive Voltage (B+) OK
- Supply voltage and fuses for respective system OK
- Ground (GND) connectors for transmission OK
- Check GND connections for corrosion and damage and repair if necessary.
- Check TCM GND connection per wiring diagram.
- Check battery GND strap and GND strap between battery and transmission.
- Selector lever in "P" position
- Parking brake applied
- Ignition switched off
- Connect VAG 1551 (VAG 1552) scan tool to 16-pin Data Link Connector (DLC) to left of steering column, using adapter cable VAG 1551/3.
NOTE:
- If nothing is shown on the display, check the power supply to the DLC.
- Additional operating instructions can be obtained by pressing the HELP button on the VAG 1551 scan tool.
- Press the -> button to advance through the program sequence.
Indicated on display 1)
V.A.G - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer
2 - Blink code output
1) Operating modes 1 and 2 are displayed alternately
- Switch ignition on.
- Operate brake pedal one time.
- Press PRINT button to switch printer on (indicator light in button comes on).
- Press button -1- to select "Rapid data transfer" operating mode 1.
Indicated on display
Rapid data transfer HELP
Insert address word XX
NOTE:
- After address word 33 is inserted and confirmed with the -Q- button, the OBD program can begin. OBD functions Selectable Functions (Modes) Under Address Word 33, CARB/OBD II
- After address word 00 is inserted and confirmed with the -Q- button, the automatic test sequence can begin (the DTC memory for every system is checked). Stored malfunctions are displayed in sequence and printed out.
Indicated on display 1)
V.A.G - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer
2 - Blink code output
1) Operating modes 1 and 2 are displayed alternately
- Press button -1- to select "Rapid data transfer" operating mode 1.
Indicated on display
Rapid data transfer HELP
Insert address word XX
- Press buttons -0- and -2- to insert "Transmission Electronics" address word 02.
Indicated on display
Rapid data transfer Q
02 transmission Electronics
- Press -Q- button to confirm input.
Indicated on display (control module identification)
8D0927156N AG5 01V 3,7l 2V US D74
Coding 00000 WSC 12345
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.