2008 f150 5.4
 

Crank .no start. No Rpm when cranking. Engine light stays on while cranking. New cam sensors and crankshaft sensors. Wire from sensors back to pcm tested out good. Voltage test at pcm pin was 10v in one wire 3 volts on other crank wire. Pcm disconnected I'm getting a good. 55 volt from the crank senor . When I unplug the cam sensor's I get no voltage or ground . Please help

Have you checked for spark, fuel pressure, and for injectors pulsing?

Yes I have 12 power to coils but no pulse no spark. Good fuel pressure my guess is the pcm is not receiving the signal from the crank to turn on pulse but it's good wired and new sensor. I was told the pcm has to send out a circuit to the crank.

Have you checked the PCM power relay and fuse?

Spray a little starter fluid into the intake and see if it starts. If it does, fuel supply problem, if not spark problem.

No fuel problem
and pcm relay is perfect

What about the fuse?

Crank no start 2008 F150
 

new cam and crank sensors. Wiring fron sensor to pcm tests good. Constant12v to coils and in jectoes with key on. But no pulse spark on cranking. AC voltage from crank sensor while cranking is .42 to .48 I get no Rpms on the dash and check engine light stays on during cranking. I'm getting no codes. Pcm relay checks out good. Is this voltage enough to get the pcm to send out the spark signal. Also fuel press is good

Does anyone know where I can get the Pcm sensor wiring diagram.

Why did you start a new thread?

https://www.f150online.com/forums/20...150-5-4-a.html

Have you checked the FUSES?????

I m new to the site and wasnt sure how to post.
all the fuses are good

I posted the first day and then couldn't figure out how to get back there

Checking + voltage is only half the job.
You also need to check ground AT each of the devices.
How are you confirming no pulse at the coil-on-plugs?

I would try squirting starting fluid in, maybe figure out if the fuel delivery is the problem.

You need an online spark tester to check for coils firing, noid lights to check for injectors pulsing. Most parts stores have them in their loaner tools.

Spark tester:

https://cimg4.ibsrv.net/gimg/www.f15...db3b4d9b42.jpg

Noid lights:

https://cimg9.ibsrv.net/gimg/www.f15...ddd5c8b4bc.jpg

where did you get the crank sensor