The Orion ECU is a universal controller designed for most types of Optic, Hall or Magnetic reluctor sensors. It can read 2 sensors in total. Mostly Crank and Cam or Speed sensors. Below is a link to a drawing with the different connect options for the Orion triggers.

Crank & Cam sensor Options

The crank and cam angle sensors on an engine is used to determine crank and cam angles. (See the sub folders for more information.)

A crank angle sensor can be used alone for non VVTI engines, but this can only give information relative to 360 degrees. This engine will only run with split sequential injection and wasted spark coil firing. If full sequential injection is selected, injection is not in sink per engine stroke. It means you may sometime inject on the bottom deck of exhaust stroke and sometimes on bottom end of compression stroke. The aim is to always go for injection angle at bottom stroke just after the intake valve closes. Here atomization will be at its best and also consistent even if the stroke is not in sink. Full sequential spark is not possible in this scenario.

The cam angle sensor will give the ECU information over 720 degrees. This will indicate the 4 strokes for sequential injection or coil firing. Depending on the trigger wheel designs, some engines may need up to 2 revolutions cranking before the ECU can sink properly. Some programs may start in split sequential injection and fire the injectors in split sequential to enhance starting. Thereafter it will go to full sequential mode and stay there.

VVTI engines may have additional cam angle sensors that indicates the cam angle relative to the crank angle. This will let the ECU calculate and manipulate the cam angle for RPM and load variances. There may be intake cam control, exhaust cam control and also lift control. Then V type engines have all this in dual banks.

There are three types of sensors. The Magnetic reluctor sensor, Optic sensor and Hall type sensor.

The Magnetic reluctor sensor is a coil wound over a magnet. The teeth on the crank gear will disturb the magnetic field and that will generate a voltage spike over the 2 wires. The sensor is normally located on the engine block and picks up from a toothed wheel on the crankshaft. The physical position of the sensor may vary from front pulley, inside block and flywheel.

Hall and optic sensors both give a square wave outputs and are treated exactly the same. They have electronic components in the sensor which convert the signals to square wave. The Hall sensor uses magnetic field where optic sensor uses infrared light. In both cases a beam is broken and detected. The sensor output is usually an open collector transistor which means it will require a pull-up resistor normally situated in the ECU or TCU. This sensor is normally located on the valve cover and picks up protruded teeth from the camshaft. The physical position of the sensor may vary. The VVTI sensor will be positioned on the actual camshaft and not on the cam pulley to measure cam movement.