Lumina V6-191 3.1L VIN T MFI (1993)
which are equally spaced 60° apart. the seventh slot is spaced 10° from one of the other slots. As the interrupter ring rotates with the crankshaft,
the slots change the magnetic field. This will cause the 3X hall-effect switch to ground the 3X signal voltage supplied from the ignition module.
The 24X interrupter ring and hall effect switch react similarily. The ignition module interprets the 24X and 3X "ON-OFF" signals as an indication
of crankshaft position, and must have both signals to "fire" the correct ignition coil. The ignition coil determines crank position for correct ignition
coil sequencing by counting how many 24X signal transitions occur during a 3X pulse.
LOCATION
The dual crankshaft sensor, secured in an aluminum mounting bracket and bolted to the front left side of the engine timing cover, is partially
behind the crankshaft harmonic balancer. A three wire harness connector plugs into the sensor and connects it to the module.
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.
