We have been at this truck for weeks now. I bought it about 3months ago and it just sounded like it needed new injectors. In the last 3weeks we have replaced the injectors 3 times because it keeps sounding the same. Its a constant misfire whether at idle or acceleration. I pulled the codes with my scan tool and its giving codes p0193, p0113, p0237, p0069, p0483. Also it says fuel rail pressure relative to map.  We have checked over and tested the wiring harnesses and this is what we have come up (truck in run position) the fan has 5volts, the cam black/blue 35ohms tan/yellow 5.1v grey/black millivolts, map sen shows 5volts on feed wire the ground was within specs but the signal wire had 5.1volts.

Is the signal wire supposed to have 5v @ map sensor and is the signal wire to cam sensor supposed to have 5v to?

Any ideas I will appreciate. I'm at a loss right now.

It is a 07 5.9 Cummins

Thanks

Edited November 13, 20168 yr by Cjchap

The first thing I think of when I see that many codes is something is shorting out causing the sensors to go wacko.  

 

I would test each sesnor for a short etc.  

 

I know when I had an oil pressure sensor shortout internally it caused a ton of codes and weird issues.

I have tried to find the values of resistance for the map and can sensor and can't find anywhere. On my scanner the map is showing 29.6 and fuel rail is bouncing between 20 and 50lbs. This is with the key in the on position not cranked over.

Is there supposed to be 5v on signal wire for map and cam sensor?

I think all sensors should use 5v input.  I would test for shorts to ground from the input v and output wires on the sensors.   

 

map will read 29 at idle as it reports boost in InHG, so at 29 you get ~14 PSI which is about what atmospheric is at sea level.

When I got the 29 for the map the truck was not idling. Is that normal when its off?

Also the connector for the map is showing 5v in 2 spots.

truck of or idle still should have 14ish psi.

 

You will have to checkout the wiring diagrams to see if that is right or not/.

OK. I'll look thank you.

All wiring checked out fine.

OK. Now a further issue after testing the fuse panel. I pulled fuses one at a time and tested. When I got to pcm engine management socket both sides tested hot. One side tested 11.7v and the other side tested 12.3v. Is this supposed to be like this? Like a dual power for one source? Any ideas would be great. 

Thanks

yea that's not right.  sounds like you have a short to 12v somewhere.

Edited November 15, 20168 yr by Me78569

I do believe a diode opened up inside the pcm. I'm gonna open it up and check this morn.

Good luck. I've heard the PCM board is filled with that jelly resin stuff. Can't do much with it.

Thanks. I'm hoping its like the ham amplifiers I mess with. 

Mostly likely not. Most of the system is shielded away from RF frequency rather well.

Thanks for that. I was worried that my radio antenna did something to it. Where I park it my wires are 50ft in air above it. Do you know if its surface mounted diodes and resistors inside the ECM? It is opening day so I went hunting instead of pulling it early this morn. I needed to chill for a minue. I'm about ready to pull my hair out over this.

I got it open but its all surface mount components. No jelly inside. Not much I can do with it tho. Any recommendations on where to go? New? Remaned?

Any kind of module rebuilder. On module you could try is Module Masters its right here in Idaho..

 

https://modulemaster.com/rebuilds/

 

Quote

I do believe a diode opened up inside the pcm.

I'm also assuming your talking ECM and not the PCM...

Edited November 15, 20168 yr by Mopar1973Man

OK thank you. Yep ECM. It said PCM Engine Management of fuse panel. That's why I was asking to be sure

Here is power distribution...

Thank you for that diagram. I was just reading about your test for the alternator. I'm going to do that in the morning. I did order a new ECM just in case. Weird thing too is check engine light has never been on once during this.

On 11/16/2016 at 7:14 PM, Cjchap said:

Weird thing too is check engine light has never been on once during this.

 

Normally it never does trip a code or check engine light.