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This sensor can also be referred to as the
Cylinder Identification (CID) sensor. As the engine rotates the
sensor will signal to the Electronic Control Module (ECM) that
cylinder number one is approaching Top Dead Center (TDC) and the
timing of the injection pulse can be determined. On an inductive
sensor, a resistance value should be seen between its terminals
with these terminating back at ECM. The output signal from these
units can be in either analogue or digital format (sine wave or
square wave) and will depend on the manufacturer concerned.
Vaxuhall have also used a Alternating Current (AC) excited
sensor on their Simtec engine management system.
It is unlikely that a failed camshaft position sensor will cause
the engine not to start, as this particular sensor only times
the injector pulses. When this sensor is disconnected the point
at which the injector fires can be seen to 'shift' giving an
incorrect point at which the fuel is delivered behind the inlet
valve. |
