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 90 CS QuattroFACTORY OEM SERVICE PROCEDURE
Initiating Engine Basic Setting
- When ENGINE BASIC SETTING is initiated, ECM establishes the following conditions:
- Closed throttle position is blocked
- EVAP control solenoid valve remains off, preventing purge
- A/C is turned off
- EGR control solenoid valve remains off, preventing EGR function
- ECM ignores dynamic signal from Engine Coolant Temperature (ECT) sensor and assumes a constant value of 176°F (80°C).
- Command is given for Oxygen Sensor (O2S) circuit to learn new values.
- Before initiating ENGINE BASIC SETTING:
- Ensure coolant temperature is at least 185°F (85°C)
- Ensure accelerator pedal is not pushed down
- Turn off all electrical accessories
- Turn off A/C
- Shift transmission into Park or Neutral.
- Retrieve codes. See RETRIEVING CODES. If codes are present, repair faults as necessary. Clear codes. See CLEARING CODES. Start engine and let idle. Select function "04", INITIATE BASIC SETTING. Enter appropriate display group number. Press HELP button for procedure on inputting display group numbers. See information following table for specified values and diagnosis.
DISPLAY GROUP VALUES
| Display No. | Specified Value | Component/System |
|---|---|---|
| 1 | 135-160 | ECT Sensor |
| 2 | 150-165 | MAF Sensor |
| 3 | 28-32 | RPM Sensor |
| 4 | 0-10 Or 240-255 | IAC Valve |
| 5 | 0-10 Or 240-255 | IAC Valve |
| 6 | 126-130 | IAC Valve |
| 7 | 20 | Shift Inputs |
| 8 | 120-136 | O2S |
| 9 | 0 Or 3 | O2S |
| 10 | 50-100 | TP Sensor Learning |
NOTE:
"Momentary" refers to dynamic data most currently displayed. Displayed values can change continuously as conditions change. Display groups 11-19 are for driveability trouble shooting (idle problems or loss of power) and special component malfunctions.
Factory Service Tools
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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.