Viper GTS V10-488 8.0L (1998)
Crankshaft Position Sensor: Description and Operation
SYSTEM OPERATION
Timing Slots On Crankshaft
The crankshaft position sensor detects slots cut into a disk in the middle of the crankshaft. There are 5 sets of slots. Each set contains 2 slots, for a
total of 10 slots. Basic timing is determined by the position of the last slot in each group. Once the Powertrain Control Module (PCM) senses the
last slot, it determines crankshaft position (which piston will be next at TDC) from the camshaft position sensor input. It may take the PCM up to
one engine revolution to determine crankshaft position during cranking.
The PCM uses the camshaft position sensor to determine injector sequence. Once crankshaft position has been determined, the PCM begins
energizing the injectors in sequence. The PCM determines ignition timing from the crankshaft timing sensor.
Crankshaft Position Sensor Location
The crankshaft position sensor is located in the passengers side of the engine block, below the exhaust manifold.
