The dash guages speedo Tach used to jump up and fall back to zeroe when the key was turned on. this does not happen. After the key has been on a while in the Odometer it say NO BUSS. THe engine cranks but won't start. It was running pretty good I shut it off at work after work it would not start. I pluged my auto x ray scanner in and it won't work it acts like there is no vehicle pluged into it. I heard it might be the CPS so I unpluged it and the guages still don't bounce when I turn on the key. Any ideas as to what I could do or check? I have heard to check all of the grounds. I am not sure where they are? I have heard of corosion on the instrument cluster plug but would that keep it fom starting or just cause no buss and no guages on the instrument cluster? Help
Disconnect the crankshaft position sensor and turn the key on. See if the "no bus" message goes away and the gauges come back to life. If so, replace the crankshaft position sensor. On a 4.7 it is just above the starter, on a 4.0 it is on the left side of center of the bell housing. The modules all communicate on the bus and if it is down the vehicle won't start. I've seen the crank sensor short out and pull the bus down resulting in the exact condition you described.
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