Coding Engine Control Module: Notes
WARNING: This page is about a different car, the 2001 Audi S4 and 2001 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
After coding ECM and starting engine for first time, allow engine to idle for several minutes so ECM can go through learn function. Idle speed may be erratic while ECM is learning.
If Engine Control Module (ECM) is replaced, it is necessary to code new ECM. If new ECM is not properly coded, the following problems may occur:
- Driveability problems (i.e., harsh shifting).
- False malfunctions stored in ECM memory.
- Increased fuel consumption.
- Increased exhaust emissions.
- Reduction in transmission life.
- All ECM functions are not carried out (i.e., EVAP system operation).