Little background to leading up to this past week.  Had the P0237 and P0112 codes with the original ECM.  Replaced the MAP Sensor and IAT sensor first.  Cleaned the grounds. Still had issues. Hooked it to a snap on code reader and could watch the voltage drop out to the sensors. Ordered an ECM from the number one place on the list here. Installed it. Great for 150 miles. Then got a buck and lost all throttle response.  Then it came back, bucked again and then threw the P1689 code for no communication between the ECM and IP.  While at the shop they went through everything using insight.  Pump was dead. New pump installed. Same issue. No communication.  Wiring checks out. But they are saying that the ECM could have been repaired inproperly and took out the electronics on the VP

On the bright side of all this, the remaned ecm doesn’t have the p0112 and p0237...

So the truck has a new VP now. New ecm still won’t communicate with the pump.  Truck runs good with the old ecm just throws the p0112.  Strange thing when driving it home. Old vp I saw 30 at most 32psi boost.  New VP it jumps to 35psi without any hesitation.  Now I’m starting to wonder if a short in VP took out the ecm.  Maybe it was just coincidence that it went after installing the new ecm.  I don’t really have a straight answer on the whole situation.  I know the harness’s is good. No shorts.  Alternator checks out.  0.013 on the ac leak test. Guess I’ll have to see what pans out in the whole situation 

Here's a fun little update.  Sent the ecm back to the rebuilder.  Said it had a short on the IP circuit.  Came back with a bunch of paperwork stating it was tested. And came back with a bunch of stickers stating my truck has a short.  I have $700 in labor charges and a write-up on the bill that there is nothing wrong with the harness.  

 

Took it to cummins this afternoon to have the ecm installed incase I was missing a step in the process and to rule out any variables.  Ecm threw the same group of codes as the first time I installed it. They cleared them started backing out of the garage and low and behold. P1689 came up again.  His remanned ECM has issues. He is denying the fact and swears my truck shorted it out. But if that was the case, why does my old ecm not have the same communication issue?

1 hour ago, bap371981 said:

They cleared them started backing out of the garage and low and behold. P1689 came up again.  His remanned ECM has issues. He is denying the fact and swears my truck shorted it out. But if that was the case, why does my old ecm not have the same communication issue?

 

P1689 is communication code. Basically anything to screw up communication between VP44 and the ECM. 

 

Possible Causes

• Wiring & Connectors
• Fuel Injection Pump Relay Output Circuit Open
• Ground Circuit Open Or High Resistance
• Datalink (+) Circuit Open
• Datalink (+) Circuit Shorted To Ground
• Datalink (-) Open
• Datalink (-) Shorted To Ground
• ECM

I can see the issue being the truck if the original ecm did the same thing. It doesn't even look like he opened the ecm I sent back for the warranty repair. I drove the truck 350 miles on the original ecm and it still hasn't shorted out 

 

Here you go the wiring between the VP44 and the ECM pretty simple to test. Basically, unhook both the VP44 and the ECM. Now ohm test from pin to pin it should be ZERO ohms. With it still unhooked now do the pin to GROUND. This just proves there is no wires shorted to ground this should show INFINITE ohms (Open circuit).

 

Did all that multiple time. Even grabbed the harness and did the wiggle test.  Still everything points to the remanned ecm.  It's just frustrating. Every test I do or the shop does come up with a perfect harness

Did you get a chance to look at W-Ts articles on the grounding issues? Basically it shows the factories grounding blunders in the harness.

 

 

4 minutes ago, JAG1 said:

Did you get a chance to look at W-Ts articles on the grounding issues? Basically it shows the factories grounding blunders in the harness.

1

 

 

Took care of that one when I first had the p0112 and p0237 codes with the original ecm. 

Any word from Auto computer spec people?  Did they not stand behind their work or still blaming you?

They are offering a partial refund after I had Cummins install the ecm that sent back that they said they repaired. Cummins tech barely got out of the garage before it threw the code for no communication.  They actually got the company to answer the phone and they told him the ecm was junk.  Took all that just to prove to them it wasn't a short on my truck.  So I have about $1000 in labor charges to prove their repair job was junk. 

3 minutes ago, bap371981 said:

They are offering a partial refund after I had Cummins install the ecm that sent back that they said they repaired. Cummins tech barely got out of the garage before it threw the code for no communication.  They actually got the company to answer the phone and they told him the ecm was junk.  Took all that just to prove to them it wasn't a short on my truck.  So I have about $1000 in labor charges to prove their repair job was junk. 

My experience exactly except with a different co. I wish $1000 was all I had to spend on that experiment. I know nothing of the people you used other than what is here.

 I feel your pain.

Edited June 13, 20186 yr by dripley

20 minutes ago, bap371981 said:

They are offering a partial refund after I had Cummins install the ecm that sent back that they said they repaired. Cummins tech barely got out of the garage before it threw the code for no communication.  They actually got the company to answer the phone and they told him the ecm was junk.  Took all that just to prove to them it wasn't a short on my truck.  So I have about $1000 in labor charges to prove their repair job was junk. 

 

Could you get in contact with @pepsi71ocean and tell him about this so he can update his list of ECM rebuilders.

What company was this again?  One of those florida companies?

 

Im pleased with my new ECM . After having a delayed boot up for about 4 years , Im still thrilled every time I jump in my truck and it fires up immediately

 

 

.

Edited June 13, 20186 yr by GSP7

1 hour ago, GSP7 said:

What company was this again?  One of those florida companies?

 

Im pleased with my new ECM . After having a delayed boot up for about 4 years , Im still thrilled every time I jump in my truck and it fires up immediately

 

 

.

I'd like to know also which company is trying to screw you. If it's Auto computer specialist (https://autocomputerspecialist.com) then I'm in disbelief because of all the other success stories I heard about them. And I just spoke with them myselflast week with good results. I guess I'll see when I get my ECM back from them. 

 

It is auto computer specialist.  I went with them because of all the good reviews.  They haven't been helping at all. Never once offered to send a different ecm. Said they repaired the one they sent me and when I got it back it was still bad.  They swear there is a short in my truck.  Cummins and the Diesel shop went through the harness and found nothing. Every single test both places did pointed to a faulty ecm. 

Well that sucks.....just when you think.....

I guess I'll have to wait and see how mine turns out, not sure now if I even want to plug it in lol. 

Well just got this email from ACS sounds like they did eneible 3-cylinder, I just wonder if it's all one option or you can do it separately. Meaning if you can enable 3cyl without enabling 6cyl high idle.

 

Edited June 15, 20186 yr by Dieselfuture

I believe I would install it when I got just to be sure it works as advertised. Hate to see you put it on later just to find out you have problems after the warranty is up.