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Author Topic: So I have this MIL code that won't go away.......  (Read 799 times)

SargeW

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So I have this MIL code that won't go away.......
« on: January 26, 2018, 12:30:58 AM »
I have had a MIL light and trouble code come on a few times in the last few months. It has gone gone off and on a few times, but has not stayed on for very long. Then it was gone for about a month, but it came back about 2 weeks ago, and now it won't go off. I did have a few random codes that would come and go, nothing remained on for very long.

The code that won't go away is SPN 4342 FMI 3. I tried running the code on my Cummins Quick Serve phone app, and after in putting my ESN and entering the code, I get "Aftertreatment 1 Diesel Exhaust Fluid Temperature 2- Abnormal Rate of Change.

Not sure what that means, but the coach is still running like normal, and the code still shows as Active when I check the fault codes in the digital display.

I have tried all the rest procedures, but none have cleared the code. I called Tiffin customer service and spoke to a tech. He recommended turning off the chassis battery switch for a few minutes, then turning it back on and starting the coach. Nope, no love.

Anyone have a clue what the code means in plain English?

I am supposed to get a call back from a different tech tomorrow and maybe get some more info.
« Last Edit: January 26, 2018, 04:51:02 PM by SargeW »
Marty--
2017 Tiffin Allegro Bus 40SP
Cummins ISL 450 HP/Powerglide chassis
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Dauninge

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Re: So I have this MIL code that won't go away.......
« Reply #1 on: January 26, 2018, 08:17:41 AM »
You most likely need to speak with Cummins, as it is related to the engine. The DEF system can be a nightmare. It can set codes due to a faulty sensor. Or there really could be a problem. The code has to do with the DEF line heater, measured at an exhaust bank.

Cummins will most likely have to clear the code. It is best if the code is still present when they hook up to it.

Depending on the severity of the code, in some instances ignoring a code will cause the engine to de-rate. It will start at say 10% de-rate, then to 25%, and continue until the engine will eventually shut down. It may take 500 miles for the engine to shut down. Again, it depends on the severity of the code.

Disconnecting the battery will not reset codes.

« Last Edit: January 26, 2018, 08:19:39 AM by dauninge »
Dawn
1995 Southwind 33 (Retired)
2005 Georgie Boy Pursuit M 3500DS

SargeW

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Re: So I have this MIL code that won't go away.......
« Reply #2 on: January 26, 2018, 09:30:44 AM »
Thanks, I figured it was emissions related, just didn't know to what extent.
Marty--
2017 Tiffin Allegro Bus 40SP
Cummins ISL 450 HP/Powerglide chassis
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Rene T

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Re: So I have this MIL code that won't go away.......
« Reply #3 on: January 26, 2018, 11:35:51 AM »
When I first read the title to this post Marty, I thought is was going to be about your Mother-In-Law.  (MIL)   :o ::) ;D
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

SargeW

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Re: So I have this MIL code that won't go away.......
« Reply #4 on: January 26, 2018, 04:53:31 PM »
Well, I have had a few "mother-in-laws" that would apply to Rene! But I am fresh out at the time. I did make an appointment with a Cummins dealer in La Jolla, for early this coming week.  It sounds like a sensor issue of some sort. Gotta plug it in to find out.
Marty--
2017 Tiffin Allegro Bus 40SP
Cummins ISL 450 HP/Powerglide chassis
Visit our new travel blog! http://www.mytripjournal.com/rvnchick2018
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SargeW

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Re: So I have this MIL code that won't go away.......
« Reply #5 on: January 30, 2018, 11:19:05 PM »
So the stubborn MIL light was resolved today. I took the coach to Cummins Pacific, in El Cajon, Ca. Nice facility BTW. The service supervisor, Robert, very nice knowledgeable guy. I noticed when I pulled into the lot that there were several other RV's there.  I asked him during the check in process, "so, do you do many RV's here?".  And his answer made me even more  comfortable. "Oh yeah. All day, every day!" 

So a long story short, they took it in and verified the MIL code that my  VMSpc had been alarming for the last few weeks, and started looking for the reason. In checking the voltages on the concerned wires that controlled the heat on the DEF lines, all three lines should have registered 5 volts on the VOM.  Two did, one showed 0 volts. In tracing the rather long length of the wire they found that one of the electric supply wires for the DEF heater had pulled loose and was laying against the fan clutch of the radiator cooling fan.  It took 6 months,  but the fan had finally wore through the wire, severing the connection. That explained the intermittent MIL leading up to the constantly displayed MIL. 

The below pic is the section of the wire that the tech cut out and repaired the wire with new connectors and heat shrink.

So it cost me a little time, (as Tiffin stepped up with warranty approval) but now all is back to normal, and the Journey continues!
Marty--
2017 Tiffin Allegro Bus 40SP
Cummins ISL 450 HP/Powerglide chassis
Visit our new travel blog! http://www.mytripjournal.com/rvnchick2018
Support your local Police Officer, Fire Fighter and Military!

Alpena Jeff

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Re: So I have this MIL code that won't go away.......
« Reply #6 on: January 31, 2018, 05:54:00 AM »
Glad they found the problem Marty. Safe travels!
Jeff
Jeff & Judy
2016 Newmar Ventana 3427
2018 GMC Canyon All Terrain toad
Blue Ox Aventa LX - RVi3 - EEZRV
Retired to "the lake" in north Michigan

Kevin Means

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Re: So I have this MIL code that won't go away.......
« Reply #7 on: January 31, 2018, 11:21:39 AM »
What a coincidence! I was just going to suggest that you check the continuity of all three 5 volt lines to the DEF temperature sensors. :) Really glad you got it fixed Marty.

Kev
2011 Winnebago Tour 42QD
Towing a Jeep Rubicon Unlimited LJ
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(Can't wait to spend more time RVing)
Lakeside, California

jagnweiner

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Re: So I have this MIL code that won't go away.......
« Reply #8 on: January 31, 2018, 11:30:33 AM »
When I first read the title to this post Marty, I thought is was going to be about your Mother-In-Law.  (MIL)   :o ::) ;D

Yeah, title definitely made me think about my MIL who's lived with me and the DW for the last 12 years.  Glad you got it fixed, Marty.
-Scott
2000 Itasca Horizon 36LD

Alpena Jeff

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Re: So I have this MIL code that won't go away.......
« Reply #9 on: January 31, 2018, 12:22:26 PM »
I was just going to suggest that you check the continuity of all three 5 volt lines to the DEF temperature sensors.

Kev
Yea, me too. ;)
Jeff & Judy
2016 Newmar Ventana 3427
2018 GMC Canyon All Terrain toad
Blue Ox Aventa LX - RVi3 - EEZRV
Retired to "the lake" in north Michigan

SargeW

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Re: So I have this MIL code that won't go away.......
« Reply #10 on: January 31, 2018, 04:03:01 PM »
You guys are so smart! I knew I could count on you!
Marty--
2017 Tiffin Allegro Bus 40SP
Cummins ISL 450 HP/Powerglide chassis
Visit our new travel blog! http://www.mytripjournal.com/rvnchick2018
Support your local Police Officer, Fire Fighter and Military!

 

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