Corsica V6-3100 3.1L MFI VIN M (1994)
Crankshaft Position Sensor Installation
LOCATION AND OPERATION (3X SENSOR)
This 3X crankshaft sensor is hall-effect sensor mounted on the side of the engine block. This sensor protrudes into the block, within approximately
.050" of the engine crankshaft reluctor wheel. The reluctor is a special wheel cast into the crankshaft with seven slots machined 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," indicating the
exact position of the crankshaft once each revolution. As the crankshaft rotates, the slots in the reluctor wheel cause changes in the magnetic field
of the sensor, turning the switch "OFF" and "ON" to produce a pulse that is easily measured.
By measuring the time between pulses, the DIS module can recognize the pulse representing the seventh slot or "sync pulse." Based on this "sync
pulse," the DIS module sends a reference signal to the PCM to calculate crankshaft position (used to fire the ignition coils in correct sequence) and
engine speed.
24X Crankshaft Sensor Installation
LOCATION AND OPERATION (24X SENSOR)
This 24X crankshaft sensor is hall-effect sensor mounted on the front of the engine behind the harmonic ballancer. The ballancer has an
"interrupter ring" with 24 slots (hence the name 24X crankshaft sensor). As the slots pass the sensor, the hall-effect switch is turned "ON" and
"OFF" again, producing a signal that can be easily read. The signal indicates the relative crankshaft position every 15° of rotation and is used to
determine correct ignition timing.
