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2006 Chevy Trailblazer 4.2 Crank no start (most of the time) No RPM on scanner. Problem continued to get worse. Wouldn't start for me brother, he gave it to me, trailered it home and parked in my shop. It started in my shop so I suspected a wet condition was the beginning of the problem (dry in my shop) After moving it out of my shop then trying again wouldn't start. moved back into the shop, wouldn't start. I started testing as I learned from Paul. Actually started a couple of times but would die.
Fuel pressure 58 psi
Ohmed CKP=700
Backprobed 2 wire CKP with C2 disconnected, Ohmed=700
Continuity tested both wires individually=no open
Voltage drop tested all grounds after removing and cleaning=all good
2.5v on low reference purple wire from CKP (should be 0)
CKP making voltage (I don't currently have a scope but measured with Power Probe 4)
Suspecting PCM problem
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