Cummins Ecm Wiring Diagram

[Do Kieu]

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The relay you here clicking is the one for the VP. If your fuel pump is stock there is no relay for it. The pig tail that connects to the fuel comes directly from the ECM. I have an aftermarket AD pump that came with a relay harness that the OE pigtail connects to. It acts as the trigger for the new relay. I am pretty sure the ECM does the same for the VP relay. As far as I know they are two different functions of the ECM. Only it is better to get the lift pump on a relay and the power from battery to keep the load off of the ECM.

So it originally started with not having enough fuel pressure. I was only getting 4 lbs of pressure out of the tank, and the pick up pump wasn't putting out any more pressure. So I've changed the pickup pump to a force pump. Then the truck had ran for a little bit, but the throttle positioning pedal went into safe mode. So now the truck will not run at all. So then I changed out the tank pump and it still will not start. So now I'm not getting power to any of the plugs.

Not sure what you mean by pick up or force pump. The oe lift pump is on the side of the block. When mine went Dodge gave me the in tank pump, their aftermarket. It sucks worse than the oe. Thats when my dead pedal issues started. I finally went to a shop and the only thing they could find wrong was low pressure, 5 at idle and pretty much 0 at WOT. I added a booster pump on the frame rail and the dead peda issue went away.

I have a pump in the tank that gives low pressure, then the pick up pump on the side of the block gives the high pressure. When I started having the problem I only got a reading of low pressure. When you bump the key the block pump should boost to 20 lbs, but now I have no power to the tank pump and no power to the pick up pump.

After changing both fuel pumps (tank and pick up) I had 22 lbs of pressure. Then I lost everything after about 5 Minutes of running. Since then It's been a few weeks and I've been tracing and testing wires, to try to find the source of the problem. The engine hasn't ran or started since then.

You would be better off with a single pump like an Air Dog or Fass system or even a mechanical pump than the 2. One might have failed and is not letting fuel by. I dont know anything about a Force fuel pump other than Googling it and seeing the appear to be for marine applications? How do you have them wired? I did have double set up myself with an intank pump run of of the oe pigtail from the ECM and the other wired to an oil pressure switch.

I re read your second post. FYI 2 pumps is not OE. The high pressure pump is the VP and there is only one lift pump from the factory that provides fuel to the VP. The wiring diagrams I posted will reflect that and not 2 pumps.

I also agree you need to ditch those pumps and get to a full FASS or AirDog fuel system. Anything that uses the stock lines will never keep up with volume while under load. Fuel pressure needs to stay between 14 to 20 PSI.

For us to help you we need to know how the pump is connected. If you will find the the power connection for the pump and follow it, it will either go to a relay most likely on the firewall or straight to the wiring harness. To the wiring harnes is OE, to relay is after market and your relay could be bad or just a blown fuse. If the connection goes to the oe wiring harness it could be an ECM problem. Does your WTS light come on at key on?

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Good Morning, I don't have wiring diagrams for my 95 dynasty 36 with C8.3 300hp (Esn 45139753) built Feb. 1995. Mechanical p7100 injection. I've owned it 1yr in wisconsin. My engine has the "flame start system" for "intake pre heat". There isn't a grid heater like my cummins powered Dodge Ram. This system has 2 injectors on each side of the 4" intake tube. The 2 injectors are also glow plugs to ignite diesel fuel while starting below 45f. Power is disabled above 45. The "wait to start" light on the dash doesn't illuminate. The bulb is good. The heavy duty relay that powers the glow/plug injectors functions properly on the bench. Fuel solenoid for this system clicks when powered. I have removed the harness for this system to fully inspect/test. This harness is listed as cummins option wr9017-00 p/n 3927339. Based on a thread I found on irv2, somebody posted 2 pages for monaco "intake pre heat wiring diagram 99edp119" for a C8.3, 325 drawn 12-97. (Confusing that they are making a drawing for a '99 with p7100). Anyway, my system as I see it, 27 years after original installation does not have the "synchro start coil commander" as shown on the monaco wiring diagram. If you have a wiring diagram for a 95ish monaco with intake preheat / flame start system, May I see it? Thanks Tim

Only suggestion would be to create an account on the Cummins Quickserve site and see if you can find information on this, since it is part of the engine there should be info on it including trouble shooting.

You have to create an account and then register the SN of you engine. From there you should have access to all the parts pages and maintenance info. I'd suggest finding the part number for the injectors and then using that number to search the maintenance manuals. I have a large database of information on my engine. When I find information I think I may need in the future I print to PDF and save in my files. Years ago I could download a complete maintenance manual for my rig but they've changed the website and now you have to find bits and pieces. Still useful but not as user friendly.

Thanks for recommendation. I'm sorry that I forgot to mention that I did open a quick serve account and submitted a ticket. It's been a few days without a response from Cummins so I decided to see if somebody would have might have an intake pre heat wiring diagram from their 95ish Monaco manual. I can't imagine that it's much different from the Diagram I have attached (drawn 12-97). Must have been for some of the last C8.3 (mechanical injection, P7100 pump) engines used by monaco. I would like to see an older diagram or a photo of a 95ish engine showing the Synchro Start Coil Commander installed in the harness. Thanks again, Tim

I was able to register the engine and found through a parts search for my engine that it included option wr9017-00 (harness and screw). I also found the harness part number 3927339 as part of the kit. I could not find any installation instructions or diagram with pin out, so I went to "contact us" for a diagram or pin out, I had to complete a "ticket" for them to review my request. Re reading the "contact us" it does show to be more of a "help desk" rather than product assistance so I will call on Monday to speak with somebody about installation instructions for the flame start system components and wiring. Thanks again, tim

Thanks for your effort. I was working between that monaco diagram and the cummins bulletin that you found. I apologize for not posting that also but I was working from a printed copy that I have saved on a different computer not my phone. I've been very cautious since the controller is $300+ and I don't want to put voltage where it shouldn't go!!!!

Fwiw, we were planning to take the motorhome to eagle river for the vintage snowmobile world championships 1-13. I didn't want to rely on the generator only to preheat/start the motorhome. Plan B: we rented a cottage at lake tomahawk. Also, my neighbor in whitewater is a hodag. Her dad was a dentist and she's in her mid 70's. My dad lived in sugar camp late 70's, 80's and then Minocqua in the 90's. Thanks again. Tim

Hope you get it figured out. Good to have a back up plan. FWIW I've seen older mine equipment operators burn a rag near the air intake to get a rig started in the cold, just have to make sure it's not sucked into the intake.

Will you have shore power or will you be dry camping?? Looked at the weather report and it looks like the next 10 days is mild, much warmer then I remember it +40 years ago. I was use to below 0F growing up.

Hello, I'm confident that I'll get it operating tonight. My biggest concern was putting voltage in the wrong terminals. I completed step by testing to verify the that the controller cycles as it should (wait to start on for 30 secs, relay off after 60 secs due to no oil pressure). I still need to verify fuel solenoid operation during cranking and wiring for the shut off solenoid (injection pump). I think the "Coil Commander" is an accessory, not a requirement so I will wire the shut off solenoid properly and go from there.

We are enacting Plan B with the rented cottage on Lake Tomahawk. My prep days were consumed and it's a busy week with school sports. Plan was to dry camp. This weekend at ER is the vintage races. Next weekend is the Late Model sleds so maybe we go back and dry camp for those races.

This document is a service manual that provides information for troubleshooting and servicing generator sets and their PowerCommand 3100 controllers. It includes sections that cover control operation, circuit boards and modules, troubleshooting procedures, control service and calibration, servicing the generator, day tank fuel transfer pumps, optional enclosure fuel tank systems, and wiring diagrams. The manual contains important safety instructions and provides detailed technical information, component specifications, and repair and maintenance procedures.Read less

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