I’m fairly positive the crank sensor signal is responsible for determining engine rpm’s and driving your tach. The PCM also uses the crank sensor signal in comparison to the cam sensor signal to time injector pulse properly.
The PCM broadcasts the crank sensor signal (engine rpm’s) on the CCD bus, and the BCM is what actually picks it up to drive the instrument cluster gauges.
Like you said though, if either of those sensors is bad your engine will run like garbage, if at all.
The crank and cam sensors are hall effect sensors, digital in nature. The send pulses to the pcm when a slot passes underneath. A faulty sensor should report a 0 rpm condition to the PCM. It would be pretty difficult for it to rtead someting else. The car would not running or running like crap if this was not working correctly.
I have been troubleshooting the sensors/computer on a car that I am fixing. You can check the operation using a multimeter - let me know if you are interested in doing this; however, I do not think you need it.
I would guess that the problem is in the gauge itself. I do not know how it works but I suspect some leakage of offset.
I was at the dealer to have them check the rpm readout and to check the sensors with the scantool.The DRB3 scanner reports everytime about 300rpms less than the cluster reads.
The gauge must be faulty since the sensors tell the PCM the right RPMs...
Hope to get a new gauge cluster on my warranty.....thanks again for all your ideas!!!
Benny
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