Here's a breakdown of the process:
1. Ignition switch: When you turn the key to the "ON" position, the ignition switch energizes the ICM.
2. ICM: The ICM receives signals from the engine control module (ECM) and the crankshaft position sensor (CKP).
3. ECM: The ECM determines when to fire the spark plugs based on various engine parameters.
4. ICM: The ICM sends a high-voltage signal to the ignition coil based on the ECM's instructions.
5. Ignition coil: The ignition coil transforms the low-voltage signal from the ICM into a high-voltage spark that is sent to the spark plug.
Note: In some models, the ICM may be integrated into the ECM, which means the ECM directly sends the signal to the ignition coil.
To diagnose any issues with the ignition system, it's essential to understand the interaction between these components.
