Murphy fault code

[Rseo10]

Just got my rig started up. Throwing a fault code spn 000729 FMI 03 OC 2. Anyone know what this is?

[DieselJeep]

I got a code for a few seconds the first time I fired it up. I'm trying to search quickserve, but it's being slow. It would be nice to have a basic list of codes in case they pop up while driving so we know to cry or keep going.

[DieselJeep]

Did it go away? QuickServe isn't working apparently it has been searching for several minutes.

[Rseo10]

Didn’t go away. I now have several other ones that are appearing as well. The engine appears to be running fine from observation but I’m not sure

[DieselJeep]

Looking through their Fault Code guide online SPN 729 is listed when they mention the grid heater. I'm not sure exactly what the other part would mean. I would think, unless there's an issue with the wiring, this should go away. Do you think you started it too quickly?

[DieselJeep]

Is your fused link in there? Are you running a very long wire or maybe there's some resistance there? I let mine idle a few seconds and after shutting off and turning back on I never had a code come on. I assume all fluids are in there. But maybe there's a loose wire somewhere. Maybe review your grounds.

[DieselJeep]

Either way congratulations on getting it running. I remember it being a surreal moment for me. My emotions were mixed with nerves, terror, and glee.

[Rseo10]

Got it figured out. Had the grid heater mounted but forgot to attach it to the battery. After that I don’t think the code came up again. So far so good. A few little things to clean up electrically but it’s on its way! Thanks dieseljeep. Very excited to drive this thing

[Biodiesel Don]

It would be nice to share a few basics on interrpetting fault codes? What do SPN, FMI, and OC stand for?

I got a SPN 000097 FMI 03 OC 002

I assume I've got something on the harness hooked up incoreclty, beucase this only showed up after moving our bulkhead fitting and wiring a fan relay.

Do all R2.8 owners get acces to the Fault Code Analyer Tool (FCAT) on Quickserve Online? I can't find it when I log in with my ESN. I downloaded the Fault Code Analyzer on my iphone, but is tells me 97 or 000097 is not applicable to my ESN.

[Sanders]

Don! I know you know this by now but for the sake of others who may be reading this later on:

SPN = Suspect Parameter Numbers (What is the component or sensor)
FMI = Failure Mode Identifier (What's wrong with it)
OC = Occurrence (How many times has it happened)

Your specific fault was due to Water In Fuel (WIF) sensor not being hooked up at your fuel filter:

"Water in Fuel Indicator Sensor Circuit - Voltage Above Normal or Shorted to High Source"

[Biodiesel Don]

Thanks. These little clues are vey helpful

[ttaubensee87]

I had this error message too, my installer didn't create the water in fuel circuit so I'm going to do it. I think I have the right connectors ordered from amazon. Need to find some 18ga wire...
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Anyone on this forum know if the connector were sourced with the engine? Probably long gone by now in all the boxes thrown out but I'll ask anyway.

[RePowerToy]

Welcome!

I dont really understand the question? You need the connector? If you have the wire on the engine you can just cut it off a few inches from the plug and splice in a long piece to the filter. Then just use the connector you cut off to plug into the filter.

cheers

[metto]

i got this code on my truck 2 months ago, i googled it and found :
Inlet Air Heater Relay Output (cc# 189) Is High When Engine Control Unit Is Not Energizing The Glow Plug Relay (9540)
https://spnfmi.com/spn-729-fmi-03

[DieselJeep]

Did that go away or has it been continuous?

Am I reading it right that it's like the grid heater has power, though it hasn't received a signal to be powered? I wonder if you've got some kind of short in the area or loose wire? I'm no expert. Good luck.

I freaked out this summer with some weird codes and ultimately realized that the main bulkhead plug into the cab of the vehicle wasn't tightened properly. I thought I had twisted it and locked it in, but I just twisted both sides of the plug and vibrations over the years had loosened up the connection.