The MPU, crank positioning sensor, and cam positioning sensor all primarily perform what function?

The primary function of the MPU (Multi-Purpose Unit), crank positioning sensor, and cam positioning sensor revolves around monitoring engine parameters, particularly related to timing and speed. These sensors play a crucial role during the startup phase of the engine by determining the positions of the crankshaft and camshaft.

Accurate information about the engine's speed is vital for the engine control unit (ECU) to manage fuel injection and ignition timing effectively. During startup, the crank positioning sensor detects the position of the crankshaft as it begins to rotate, providing data to the ECU regarding the engine’s state. The cam positioning sensor complements this by offering insights about the camshaft position, facilitating coordinated timing with the crankshaft data.

The other options do not accurately describe the main functions of these sensors. They do not convert energy forms, create DC voltage for counting rotations in the context of starting, or directly energize the starter solenoid, which is a separate component of the starting system. Instead, these sensors are instrumental in ensuring precise control over engine operations from the moment it starts.