cam and crank sensor work in unison and have roll in firing the coils in proper sequence :biggrin: :-THEORY
In condensed theory the system functions this
way: The crankshaft and camshaft sensors are
connected directly to the module. The module
receives and sends a reference and camshaft
signal to the ECM. During cranking, the module
receives a signal from the crankshaft sensor;
however, it will not fire the coils until it sees a
reference pulse from the camshaft sensor. Once
it receives the camshaft pulse, it will fire the
coils in the proper sequence. If the camshaft
signal is lost after the engine is running, it will
continue to run, but it will not re-start once the
engine is shut off. The module will not fire the
coils because it doesn’t know when #1 cylinder
is at top dead center; therefore, it cannot determine
the proper firing sequence. If at any time
the crankshaft signal is lost, a loss of spark will
occur immediately.
In condensed theory the system functions this
way: The crankshaft and camshaft sensors are
connected directly to the module. The module
receives and sends a reference and camshaft
signal to the ECM. During cranking, the module
receives a signal from the crankshaft sensor;
however, it will not fire the coils until it sees a
reference pulse from the camshaft sensor. Once
it receives the camshaft pulse, it will fire the
coils in the proper sequence. If the camshaft
signal is lost after the engine is running, it will
continue to run, but it will not re-start once the
engine is shut off. The module will not fire the
coils because it doesn’t know when #1 cylinder
is at top dead center; therefore, it cannot determine
the proper firing sequence. If at any time
the crankshaft signal is lost, a loss of spark will
occur immediately.
