Engine Control Module (ECM)
The ECM controls all of the ignition system functions, and constantly corrects the spark timing. The ECM monitors information from various sensor inputs that include the following:
- Throttle position (TP) sensor
- Engine coolant temperature (ECT) sensor
- Mass air flow (MAF) sensor
- Intake air temperature (IAT) sensor
- Vehicle speed sensor (VSS)
- Engine knock sensor (KS)
- Manifold absolute pressure (MAP) sensor
- Intake air pressure and temperature sensor