Lumina V6-191 3.1L VIN T MFI (1993)
Dual Crankshaft Sensor: Description and Operation
Crankshaft Sensor - Federal Emissions
Typical DIS Crankshaft Sensor
PURPOSE:
The crankshaft sensor provides a signal through the Direct Ignition (DI), which the ECM uses as reference to calculate rpm and crankshaft
position.
OPERATION:
This sensor protrudes into the block, within approximately .050" of the engine crankshaft reluctor. The reluctor is a special wheel cast into the
crankshaft with seven slots cast into it, six of which are evenly spaced 60° apart. A seventh slot is spaced 10° from one of the other slots and serves
to generate a "sync pulse." As the reluctor rotates as part of the crankshaft, the slots change the magnetic field of the sensor, creating an induced
voltage pulse.
Based on the crank sensor pulses, the ignition module sends reference signals to the ECM which are used to indicate crankshaft position and
engine speed.
LOCATION:
This sensor is mounted remotely from the ignition module, right hand side of engine, at the end of the crank shaft.
