The electronic control module, the primary computer responsible for managing engine performance. It reads sensor data regarding airflow, temperature, and throttle position to calculate the exact fuel delivery and spark timing required for optimal combustion.
Heard on the job
We've a no-start condition, and the scanner can't even communicate with the ECM.
Do not mix it up with
- ECU: ECM specifically refers to the engine or powertrain module, while ECU is a generic term for any electronic control unit, though they are often used interchangeably.