5.8 Crank Sensor
The crank sensor input can be from either a Magnetic Variable Reluctance (MVR) sensor or a Hall
Effect sensor. The two types of sensor require different software and hardware jumper settings.
MVR
The crank sensor high and low gain settings allow a user definable change point for high sensitivity
to allow for low magnetic crank sensor outputs at low engine speeds. Typically the values are just
above idle speed.
Magnetic sensors can use either the rising or falling edge of the generated waveform. If the edge is
incorrect then the engine will misfire at some point in the engine speed range. There is also the
possibility that if the edge is incorrect on a magnetic sensor of the ignition timing on the engine
deviating from the ignition timing calculated by the ECU as the engine speed changes. To find the
correct edge either see which edge does / does not produce ignition timing changes, or using an
oscilloscope to look at the waveform. If the signal falls through the missing tooth section use Crank
Rising Edge, and if it rises through the missing tooth section use Crank Falling Edge.
To Next Page
Loading...
