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.

1994 Audi S4FACTORY OEM SERVICE PROCEDURE

Basic Setting Diagnostic Test Mode (Function 04): Notes

NOTE: For help in identifying Display Group 00-10 information charts, refer to illustrations. See Fig 1 -Figure . For help in identifying Basic Settings Values, refer to illustrations. See Figure -Figure under BASIC SETTING VALUES CHECKING TABLES.

Basic setting function is carried out with the engine running. When in the basic setting function, the Motronic Engine Control Module (ECM) establishes the following conditions:

Malfunction Indicator Lamp (MIL) on instrument panel will light up continuously.
EVAP canister purge regulator valve will stay closed.

Values can be displayed either by display group 00 showing 10 values or with display group 01 showing 4 values. When in display group 01 showing 4 values, the physical parameters of engine speed (RPM) and temperature will also be displayed. See Fig 1 .

Fig 1: Scan Tool Parameters Display Group "00" & "01"

Courtesy of AUDI OF AMERICA, INC.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.