Synchronous Injection

When starting the engine, the fuel injectors inject the fuel simultaneously and synchronously at every CMP sensor signal. When the engine is starting at a cold state, the amount of fuel is determined by the engine coolant temperature (ECT) sensor and is divided and injected.

Once the engine is running, the fuel injection occurs in a cylinder only when it is in the exhaust stroke. The powertrain control module (PCM) detects the compression stroke of the number 1 cylinder through the CMP sensor signal.