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 CabrioletFACTORY OEM SERVICE PROCEDURE
ECM "A"
- Different vehicle applications require different ECMs. Checking ECM identification code ensures vehicle is equipped with correct ECM. At the factory, ECMs are coded to identify them for correct vehicle application. ECM identification code represents vehicle application.
- Factory performs coding at ECM connectors "B" and "C". First 3 digits of code apply to terminals No. 14, 16 and 19 of connector "B", and fourth digit of code applies to terminal No. 9 of connector "C". If ECM grounds one of these circuits, "0" will be displayed. If ECM does not ground the circuit (leaves the circuit open), "1" will be displayed.
- To determine if ECM identification code is correct, check displayed ECM identification code to see if it matches vehicle application. See ECM IDENTIFICATION CODES (ECM "A") table. If displayed code does not match application, check routing of wires at ECM connector. Relocate wires in correct terminals if necessary. If wires are correctly routed, replace ECM.
ECM IDENTIFICATION CODES (ECU "A")
| Code | Application |
|---|---|
| 1010 | With M/T; Without EGR |
| 1111 | With M/T & EGR; Without EGR Temp. Sensor |
| 1011 | With Calif. Emissions, M/T, EGR & EGR Temp. Sensor |
| 1110 | ECE Version W/ M/T; W/O Heated O2 Sensors, EVAP & EGR |
| 0010 | W/FWD & A/T; Without EGR |
| 0111 | W/ FWD, A/T & EGR; Without EGR Temp. Sensor |
| 0011 | W/ Calif. Emissions, FWD, A/T, EGR & EGR Temp. Sensor |
| 0110 | ECE Version W/ FWD & A/T; W/O Heated O2 Sensors, EVAP & EGR |
| 1000 | Quattro With A/T; Without EGR |
| 1101 | Quattro With A/T & EGR; Without EGR Temp. Sensor |
| 1001 | Quattro W/ Calif. Emissions, A/T, EGR & EGR Temp. Sensor |
| 1100 | W/ ECE Version & A/T; W/O Heated O2 Sensors, EVAP & EGR |
| 0000 | Diagnostic Trouble Code (DTC) |
| 0001 | Diagnostic Trouble Code (DTC) |
| 0100 | Diagnostic Trouble Code (DTC) |
| 0101 | Diagnostic Trouble Code (DTC) |
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.