Hey guys,my buddy has a problem with his truck 2002 f350 7.3 cc
We went into work this morning,he put the truck into park and it just died.
Check all the fuses and there all good.
Pulled the codes and got u1262 communacation bus fault
Whats the problem,truck will not restart.
Any help would be great,but hes leaving for florida tonight and needs the truck.
Ohh i also tried doing a buzz test on the injectors,but AE says its running the test but nothing is happening,it just sits there.
I know AE is connected,as i pulled the codes.

 

Check to see if the tach is movin while cranking it over. IF not then i would have to say cam sensor.

 

I dont think it would be the CPS as i cant even do the buzz test.

 

Do all of the ding dings, WTS and dash lights function properly when KO? Does it turn over, but just not start? What voltage is at the batteries?

 

Yes all the ding,dings work.It turns over,but it wont start.
We towed it home,got home the truck started,but only ran for a few minutes then died.Now im back to what it was before,not starting.I check the batts i have 11.3,i did disconnect the batts.
What i find weird,is that it wont let me do the buzz test.
Oh and i also have another code c1284,but im not sure which sensor it is.The one on the top of the pump or side of the pump.

 

I would start by making sure the batteries are fully charged. How old are they?

<table border="1" cellpadding="3" cellspacing="0"><tbody><tr><td align="center" valign="top">P1284 </td> <td align="center" valign="top">— </td> <td align="center" valign="top">N/A </td> <td align="left" valign="top">ICP failure — aborts KOER CCT test </td> <td align="left" valign="top">See codes P1280, P1281, P1282, P1283, P1211 </td></tr></tbody></table>
<table border="1" cellpadding="3" cellspacing="0"><tbody><tr> <td align="center" valign="top">P1280 </td> <td align="center" valign="top">a, b </td> <td align="center" valign="top">ICP </td> <td align="left" valign="top">ICP circuit out of range low </td> <td align="left" valign="top">Open/grounded circuit, biased sensor, PCM </td></tr> <tr> <td align="center" valign="top">P1281 </td> <td align="center" valign="top">a, b </td> <td align="center" valign="top">ICP </td> <td align="left" valign="top">ICP circuit out of range high </td> <td align="left" valign="top">Circuit shorted to 5v, biased sensor, PCM </td></tr> <tr> <td align="center" valign="top">P1282 </td> <td align="center" valign="top">a, b </td> <td align="center" valign="top">IPR </td> <td align="left" valign="top">Excessive ICP pressure </td> <td align="left" valign="top">Faulty IPR regulator (sticking), IPR short to ground </td></tr> <tr> <td align="center" valign="top">P1283 </td> <td align="center" valign="top">— </td> <td align="center" valign="top">IPR </td> <td align="left" valign="top">IPR circuit failure </td> <td align="left" valign="top">Open/grounded circuit, stuck IPR, loose connection </td></tr></tbody></table>
<table border="1" cellpadding="3" cellspacing="0"><tbody><tr><td align="center" valign="top"><table border="1" cellpadding="3" cellspacing="0"><tbody><tr><td align="center" valign="top">P1211 </td> <td align="center" valign="top">a, b </td> <td align="center" valign="top">IPR </td> <td align="left" valign="top">ICP pressure above/below desired </td> <td align="left" valign="top">IPR valve failed, stuck, or shorted to ground </td></tr></tbody></table></td> <td align="center" valign="top">
</td> <td align="center" valign="top">
</td> <td align="left" valign="top">
</td> <td align="left" valign="top">
</td></tr></tbody></table>
I would say check all of the connections and make sure there is no wiring problem before fooling with those items.

 

we checked the wiring as good as we could.Is just weird that the thing just died,when putting it into park.
We have it running now,but every time i plug AE in,it kills the motor.

Thanks for the help tenn !!!

 

Are you using a power invertor to power your laptop in the truck?

 

No,i just tried the buzz test on my truck and it works,but not on his.

 

Hmmm, that earlier bus error code gives me pause. Perhaps you may want to disconnect and reconnect the PCM. A quick inspection of the connection and at least make sure it is tight. Just a thought. Of course make sure to disconnect the batteries if you do that.

 

Ok ill give that a try,i just dont understand why AE is not communicating with the computer.Instead it shuts the truck off.

Ill try what you said and report back.

 

Well, if the PCM connections are fine, perhaps his OBD port or wiring has a short. Electrical gremlins are a PITA. Good luck.

 

Well we pulled the batt connections,pulled the pcm and everything looks good there.I also turned the headlights on while i was at it.With the batts disconnected.
Still no go.AE wont do anything but pull codes.Cant do buzz test.
And when the truck does start,its hard to start,and when i connect the AE the truck shuts off.

 

Man, usually it would run like crap but I still suspect a wiring issue, maybe the UVC area or inside wiring. Check for schaffing along the outside of the VCs. All is pointing to the ICP and or IPR. Did the IDM get wet? You see where I am at on this now. We are down to checking connections and wiring. Is it still showing the same 1284 code?

 

yes still showing same code,ummm where the idm?