In a "distributorless" ignition system (DIS), which of the following is NOT included?

In a distributorless ignition system (DIS), the design eliminates the traditional distributor and its associated components for efficiency and reliability. One notable omission is the rotor, which is typically used in a traditional ignition system to direct the high voltage from the ignition coil to the correct spark plug through the spark plug wires.

In a DIS, the ignition coil plays a crucial role by generating high voltage directly at the spark plugs, usually through individual coils for each cylinder or a coil-on-plug (COP) system. The crankshaft position sensor provides important information to the engine control module (ECM) regarding the position of the crankshaft, allowing for precise timing of ignition. The spark plug wires, while they may not be used in all DIS configurations, can be present in certain setups where a single coil is used to fire multiple cylinders.

The absence of a rotor in a DIS is significant because it contributes to the system's design to eliminate mechanical components that can wear out and create maintenance issues, providing more accurate ignition timing and improved performance. Thus, the rotor's exclusion is a defining characteristic of a distributorless ignition system.