AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 347)

Wiring, Pinouts and Schematics 341
© 2014 AEM Performance Electronics
Cam Sensor
The cam sensor is typically very similar to the crank sensor but is used to calculate engine
position. It is necessary for sequential fuel calculations. It senses a toothed wheel (reluctor wheel,
reluctor ring, etc.) and converts this pattern into a voltage/frequency signal that the Infinity uses for
basic calculations. Combined with the crank position sensor, it is one of the most important
inputs to the system. There are two basic types of cam sensors, variable reluctance (VR or
“mag”) and hall-effect. The oscilloscope frequencies are similar to the crank sensor shown above
but typically with less pulses (teeth).
Shown below is a cam and crank sensor that integrates into one AEM trigger wheel (24 and 1).
The perimeter has 24 crank teeth. The 1 long tooth is used for the cam sensor.