AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual - Manual (Page 345)

Wiring, Pinouts and Schematics 339
© 2014 AEM Performance Electronics
Crank Sensor
The crank sensor is used to calculate engine speed, ignition timing and injection phasing angles.
Shown below, 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.
Either on its own, or combined with the cam position sensor, it is the most important input to the
system. There are two basic types of crank sensors, variable reluctance (VR or “mag”) and hall-
effect.