On the crank sensor when you turn the key on you said 0n the signal wire you are getting a half a volt that is not correct depending where the ring is to the sensor you should see around battery voltage and when cranking it could vary but not ahalf a volt check your wire back to the ecm make sure it is good and l know you put the sensor in but was it factory or aftermarket l have seen bad sensors aftermarket.

Sorry yes the light comes on.it blinks steady.

I checked signals and we have
White with red 12 plus
Black Good neg
Green less than half a volt

First are there any codes in the truck does the service light come on when you turn the key on second did you check to see if you have power to the crank sensor. and cam sensor.