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

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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

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Re: No start.
 

is teh passlock icon lite on your dash?

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It comes on and off once a week

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The truck started crankin but no start.

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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

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

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

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

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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.

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



ECM looked ok in every way

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New ECM in route...

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New ECM still no start :/

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Did the dealer program it for you

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No, eBay seller, "ECM programers" had a feedback of 100% couple thousand sales.

Re: No start.
 

so did they preprogram it for you with your vin#? If not you need it programmed. If they did you still need to do a theft learn follow this procedure.

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Tried this procedure two times, no change.

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Passlock light doesn't go off after 10 min during the procedure, waited to 15m and it still wouldn't go off so second time i did this.

insert key and try to start the vehicle. do not turn the key off, let it sit in the "ON" position for 12 minutes

turn key OFF and remove key, wait 5 to 10 secs, and put key back in and just turn to the ON position ( dont try to start)

do this a total of 3 times.
start- on wait 12 mins- off remove key- on wait 12 mins- off remove key- on wait 12 mins- off remove key and start H2 up normally.

Re: No start.
 

Try original procedure but dont try to start at any time, just turn on and wait for light to quit flashing, im assuming its flashing? do that 3 times and see what happens

Re: No start.
 

You never said if they programmed to your vin#? Needs to be done before theft learn

Re: No start.
 

Yes, It's been programed to my vin#.

PassLock light comes on exactly 1 minute after turning the key and stays constant on (not flashing) for 15min+ after whitch I switched rutines because the light wouldn't go off and the other routine doesn't call for the light to go off.

Re: No start.
 

Well im stumped. Wish I was there with my tech 2 would be much easier to get to the bottom of it. Ill look for more info for ya

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Thank you, you helped regardless.

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Ok an update, I decided to start over and found PCMB fuse is blown now. Replaced it and the truck cranks now, but no start. OBD2 communicates, no codes. PCM1 fuse gets 0v in all key positions, there is no fuel pressure and fuel gauge is not working...

Re: No start.
 

I'll try the passlock procedure again. Fingers crossed!!!

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Well passlock procedure didn't work. But i got it running.. Kind off.
I jumped PCM1 fuse to the battery and it started! And stayed running till i puled the jump.

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Technically.... If i jump the Pcm1 fuse to the ignition relay that should work...

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Is that jumper wire in the picture for the drl lights mod to come on with headlights? I ask cause any blue wires from underhood fuse block are lighting circuits. Could have caused damage to bus bar in fuse block. If you jump the pcm 1 circuit it should work but could put too much draw on that circuit causing more damage

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Yes i did this last week while the truck was down

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Come to think of it the truck was going trough it's usual clicks and noises routine before cranking after the breakdown till I did that drl mode.... I only noticed it missing after i jumped pcm1 end heard that sweet music again ushering life in to the engine,lol

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:twak: Did I fry the fuse box?

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Might have caused an open circuit to the pcm 1 fuse. When i have time tomorrow ill get the connector end views so you can test it

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Thanks a bunch!