XK (X100) V8-4.2L (2005)
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Fuel Injector: Description and Operation
Fuel Injectors
The fuel injector monitor operates on a continuous basis. Open and short detection of each injector is possible by comparing the actual injection signal
with a target injection signal. The actual injection signal is derived from a change in injector voltage when the injector is turned off and the target
injection signal is derived from an injection set flag.
A normal judgment is made when the injector voltage moves from the on to off position i.e. on the signal edge. If the target signal and the actual signal
are both set to one, a normal judgment is made. This process is repeated for each injector in firing order. A failure judgment is made when no injector
signal edge is detected i.e. no change in voltage but the injector has been triggered.
