Engine Speed Sensor: Description and Operation

Crankshaft Position and Engine Speed Sensor

Description

The crankshaft sensor is checked for loss of signal during cranking and engine running conditions. When the appropriate entry conditions have been met a loss of sensor pulses for greater than the predefined time will register a fault. If the fault is registered on 2 drive cycles then the MIL will illuminate.

Additionally if the number of crankshaft sensor pulses is incorrect by more than one pulse in any one engine revolution then a fault event is recorded. If the number of fault events exceeds the limit without the engine synchronising then a crankshaft range performance fault is registered. If the fault is registered on 2 drive cycles then the MIL will illuminate.