D 250 Pickup L6-359 5.9L DSL (1992)
Crankshaft Position Sensor: Description and Operation
LOCATION
The Engine Speed Sensor, also referred to as the Crankshaft Position Sensor, is mounted to the front of the engine.
PURPOSE
The Engine Speed Sensor generates an RPM signal for the electronic controller.
OPERATION
The engine speed sensor input is used along with the Vehicle Speed Sensor and the Throttle Position Sensor to determine when to shift the
automatic transmission into overdrive, as well as for tachometer and speed control inputs. The speed sensor signal is also used as an input for the
ASD relay, for control of the alternator field circuit.
