Engine Control Module Coding: Notes

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 (e.g., 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 (e.g., EVAP system operation).
On front wheel drive vehicles Anti-Slip Regulation (ASR), ASR warning lamp comes on.

CAUTION: Before replacing ECM, see BEFORE REPLACING ENGINE CONTROL MODULE .

NOTE: Once procedure is started DO NOT turn ignition off during ECM programming. 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.