No start.
 

So the truck lasted problem free about two years after big rebuild, good run for a 200k truck with $2k refresh.

Air ride compressor is out again after 50k miles or so.


But the big problem is new no start and dead OBD2.


The truck just died on the go and wouldn't crank after. It has all the symptoms of a dead battery but its not it, I also bench tested the starter... Ok.
Recently I started getting low engine power and it would clear by turning the ignition off.
All fuses ok, starter relay tested ok.

Re: No start.
 

Do you have a remote starter that is tapped into your data line right behing the data link connector? If so remove the splice and try that.

Re: No start.
 

Not anymore, that's the first thing I took out, reconnected al the splices

Re: No start.
 

Also today I astablished that starter cranks the engine when jumped, no start. Ignition relay clicks but starter relay don't, even when swapped.

Re: No start.
 

Try using a jumper wire across pins 87 and 30 of the starter relay and see if starter cranks

Re: No start.
 

Re: No start.
 

is teh passlock icon lite on your dash?

Re: No start.
 

It comes on and off once a week

Re: No start.
 

The truck started crankin but no start.

Re: No start.
 

10A crank fuse lights up when key in crank position...

Starter relay 87, 30 good 85 goes positive when key in second position, so I'm assuming that 86 should get grounded for cranking?

Re: No start.
 

Check the other 2 pins of the start relay, one should have power in run position and the other should have ground in the crank position

Re: No start.
 

If its not getting a ground during crank ecm is not sending crank signal.

Re: No start.
 

Thats what it looks like. You wouldn't happen to have a decent ignition diagram?

Re: No start.
 

No crank signal, no OBD conection and no spark or injection... ECU

Re: No start.
 

As long as the data line is good, power and ground at ecm is good then ecm is bad.

Re: No start.
 

That's where I'm heading, good to have second opinion, thanks.

Re: No start.
 

All grounds tested ok and 2 pink tested 12v on the ECM plugs.



ECM looked ok in every way

Re: No start.
 

New ECM in route...

Re: No start.
 

New ECM still no start :/

Re: No start.
 

Did the dealer program it for you