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 MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONREADING AND CLEARING DIAGNOSTIC TROUBLE CODESSCAN TOOL CONNECTINGCONNECTING AND OPERATING VAG 1551 SCAN TOOL
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Connecting and Operating VAG 1551 Scan Tool
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Connecting and Operating VAG 1551 Scan Tool
REQUIREMENTS
- Fuses 4, 5, 13, 23, 24, and 27 OK
- Ground connections OK.
PROCEDURE
- Switch OFF ignition
Fuse/Relay Panel:
Connect Scan Tool VAG 1551 using adaptor cable VAG 1551/1 to DLC.
- First connect black adaptor cable connector (voltage supply) to DLC # 1. These displays appear alternately as shown:
VAG self-diagnosis HELP
1 - Rapid data transfer
OR
VAG self-diagnosis HELP
2 - Blink code output
Note: Do not connect the white adaptor cable connector if there is no display. Instead, check the voltage supply for the scan tool, Refer to Data Link Connector / Testing and Inspection.
- Connect white adaptor cable connector to DLC # 2.
- The blue connector is not used
- To obtain additional operating instructions press the HELP button.
- To step through the program sequence, press the arrow button
OPERATING MODE
- Press button 1 to select operating mode "Rapid data transfer", Display will appear as follows:
Rapid data transfer HELP
Enter address word XX
OR
- Press button 2 to select operating mode "Blink code output", Display will appear as follows:
Blink code output HELP
Activate with (arrow) key
RAPID DATA TRANSFER
After selecting operating mode Rapid data transfer select diagnostic function.
- Engine Electronics 01
- Transmission Electronics 02
- Press 0 and 2 buttons to select address word 02 "Transmission Electronics".Display will appear as follows:
Rapid data transfer Q
02-Transmission Electronics
- Press Q button to enter input. The transmission control module identification is indicated via the display. Display will appear similar to the following:
097927731 F DIGIMAT 0569
Coding 127 WSC 131071
- Display breakdown is as follows:
^ 097927731 F - Control unit part number
^ Digmat 0569 - Control unit type
^ Coding 127 - Not relevant at present
^ WSC 13071 - Number of the last dealership to access coding using the VAG 1551 Scan Tool
- Press (arrow) button. If display appears as follows:
Rapid data transfer HELP
Control Unit does not answer\
- Print out a list of possible causes by pressing the VAG 1551 HELP button
- After eliminating possible causes, reselect operating mode and address word, display appears as follows:
Rapid data transfer HELP
Select function XX
- Select function code.
- Read Diagnostic Trouble Code Memory
- Start Basic Setting 04
- Erase DTC Memory 05
- End Output 06
- Read Measuring Value Block 08
- Press Q button to enter input and see the proper procedure article for your selection
Note: If function 02 Check DTC memory is to be selected
- Switch on the printer using the print button, lamp in print button lights
- When the printer is switched ON stored malfunctions are automatically printed out in sequence
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.