900 S Convertible L4-2290cc 2.3L DOHC EFI (1997)
Camshaft Position Sensor: Description and Operation
The camshaft position sensor is of Hall-effect type and integrated into the distributor.
A field rotor flange mounted rigidly on the distributor shaft rotates in the Hall-effect sensor's air gap. The field rotor flange has only one opening and this
indicates when piston No. 1 is on its compression stroke. Somewhat simplified, it could be said that the cam-shaft position sensor acts as a switch in the
sensor lead connected to the control module and which, depending on the position of the field rotor flange, is either open or closed.
On the basis of information from the camshaft and crankshaft position sensors, the control module can work out when cylinder No. 1 is ready for
combustion.
The camshaft position sensor is supplied with power from pin 59 of the control module and is connected to ground at engine grounding point G7S.
The signal, which is a square wave, is sent out from pin 2 and received on pin 44 of the control module.
The voltage alternates between 0 V when the Hall-effect sensor is open and 5 V when it is closed.
