What is the primary input reference signal to the ECM responsible for triggering spark delivery to a CPI system on a commercial vehicle NG engine?

Question

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The Camshaft Position Sensor (CPS) is crucial for the Engine Control Module (ECM) to determine the precise timing for spark delivery in a Controlled Port Injection (CPI) system on a natural gas (NG) engine. It provides information about the position of the camshaft, which in turn helps the ECM to time the ignition system correctly.

What Is the Primary Input Reference Signal to the ECM