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07-18-2018, 03:35 PM
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#1
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Junior Member
Thor Owners Club Texas Boomers Club Freightliner Owners Club
Join Date: Aug 2007
Posts: 27
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Coach Stalled in NM Mountains
We have a 2011 Tuscany 40LX. Haven't had any significant problems until this trip to Red River, NM. As we were making the climb to Bobcat Pass, the check engine light came on indicating low coolant level. This was strange in that the dash temperature gauge read fine and I knew my coolant level was also. I got enough warning to crawl to the edge of the road, but I wouldn't call it a shoulder. I went back and checked. Again, the coolant level was good. I carefully took off some of the pressure from the cap on the expansion tank and let the coach cool for about 20-30 minutes.
I started it back up and there was no indication of a problem, so I continued the climb. I was about 250 yards from the summit. After about 100 yards, the check engine light came back on. This time I had a shoulder to go to. I just let it cool and restarted after about 15 minutes. Made the summit fine and started the descent into Red River. Made it all the way to the campground with no issues. However, did a small climb up the hill and it came on again, but the road leveled out and the light went back out. We will be here awhile, so I've got time to contemplate this.
I have a couple of questions:
1. Any idea what might be going on here?
2. I've discovered that diesel pushers don't have OBD II connectors. Instead, I believe they use something called Scan Gauge D. Does that sound right? I want to get a tool to check the fault codes and reset them after the repairs. I found a ScanGauge SGDFFP J1939 & J1708 Vehicle Monitor on Amazon for about $160. My connector is back at the radiator. This has a connector and several feet of cable to run to the cockpit where it connects to a display. Anyone use this or have any alternatives? Especially how to run the cable.
thanks
Mike Patrick
2011 Thor Tuscany 40LX
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07-18-2018, 03:39 PM
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#2
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Senior Member
Join Date: Dec 2014
Posts: 1,666
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There should be another diagnostic port connector under your dash. It may take some digging but it is there. That’s the place to connect the Scangauge D.
__________________
Mike
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07-18-2018, 03:41 PM
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#3
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Moderator Emeritus
Newmar Owners Club
Join Date: Apr 2014
Location: Southern Indiana
Posts: 19,417
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I use a ScanGauge D to monitor a items and display codes. There should be a connector under the dash to connect to.
__________________
Steve
2002 Newmar Mountain Aire 4095
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07-18-2018, 03:47 PM
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#4
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Senior Member
American Coach Owners Club
Join Date: Mar 2008
Location: Van,Tx
Posts: 435
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I had a check engine light come on right before hitting Raton pass pulling a heavy load.
Didn't think I was going to make it over myself, come to find out it was my fuel filters. I replaced them both the next day and no more trouble.
My coach has the Silverleaf system with engine codes and information. It told me high filter pressure and then low injector pressure.
Good luck on your issue.
__________________
2011 American Coach 42P Tradition
Pressure Pro
2013 Jeep Wrangler Unlimited
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07-18-2018, 03:47 PM
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#5
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Registered User
Join Date: Apr 2018
Posts: 1,459
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First thing I would do is let the engine cool down to stone cold, and check the coolant level, in the cooling system, not the expansion tank.
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07-18-2018, 03:57 PM
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#6
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,867
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Quote:
Originally Posted by tx_maniac
We have a 2011 Tuscany 40LX. Haven't had any significant problems until this trip to Red River, NM. As we were making the climb to Bobcat Pass, the check engine light came on indicating low coolant level. This was strange in that the dash temperature gauge read fine and I knew my coolant level was also. I got enough warning to crawl to the edge of the road, but I wouldn't call it a shoulder. I went back and checked. Again, the coolant level was good. I carefully took off some of the pressure from the cap on the expansion tank and let the coach cool for about 20-30 minutes.
I started it back up and there was no indication of a problem, so I continued the climb. I was about 250 yards from the summit. After about 100 yards, the check engine light came back on. This time I had a shoulder to go to. I just let it cool and restarted after about 15 minutes. Made the summit fine and started the descent into Red River. Made it all the way to the campground with no issues. However, did a small climb up the hill and it came on again, but the road leveled out and the light went back out. We will be here awhile, so I've got time to contemplate this.
I have a couple of questions:
1. Any idea what might be going on here?
2. I've discovered that diesel pushers don't have OBD II connectors. Instead, I believe they use something called Scan Gauge D. Does that sound right? I want to get a tool to check the fault codes and reset them after the repairs. I found a ScanGauge SGDFFP J1939 & J1708 Vehicle Monitor on Amazon for about $160. My connector is back at the radiator. This has a connector and several feet of cable to run to the cockpit where it connects to a display. Anyone use this or have any alternatives? Especially how to run the cable.
thanks
Mike Patrick
2011 Thor Tuscany 40LX
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Mike,
The port you're speaking of IS THE OBDII port. It's just not shaped and pinned like a standard OBD II port on most automobiles and trucks 'cause the entire system is different than on those vehicles. It's called the J1939 Comm data link port. It's not just for "Scan D" attachments. It's for the techs at Freightliner etc. to plug into for diagnostics on the J1939 Data buss line. That J1939 data link carries ANY and ALL information from your engine ECM, trans TCM, ABS module and, primary and secondary air systems, to what's called the MMDC in the front of the coach. The MMDC (Multi-Module-Data-Computer) deciphers all data from and to, all those components and, then sends it to your gauges for you to read.
And not only that but, there is another J1939 diagnostic port up front too on your coach. It's typically mounted to or, hanging int the area of the fire wall, just to the left of the steering column. It can be a bear to find but, I'll guarantee you, it's there. You can plug in your "Scan D" to that port, not the rear one. A very large percentage of your needs for reading engine ops are already on your LCBU (Light Bar Control Unit) in your dash. You just have to toggle through them to get what you want to read)
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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07-18-2018, 04:19 PM
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#7
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Senior Member
Join Date: Jun 2012
Location: NorCal
Posts: 3,000
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What rpm were you running at when your engine light came on, low rpm's will cause the problem you described.
__________________
Outbound
2002 Monaco Executive 500 ISM
2004 GMC 2500HD 4X4
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07-18-2018, 04:57 PM
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#8
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Junior Member
Thor Owners Club Texas Boomers Club Freightliner Owners Club
Join Date: Aug 2007
Posts: 27
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Quote:
Originally Posted by slowmachine
There should be another diagnostic port connector under your dash. It may take some digging but it is there. That’s the place to connect the Scangauge D.
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Thanks. I just wasn't standing on my head enough, but I did find it.
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07-18-2018, 05:01 PM
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#9
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Junior Member
Thor Owners Club Texas Boomers Club Freightliner Owners Club
Join Date: Aug 2007
Posts: 27
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Quote:
Originally Posted by Outbound
What rpm were you running at when your engine light came on, low rpm's will cause the problem you described.
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I don't know the RPM exactly, but I know it wasn't low. I manually downshift on a steep grade to keep the RPM up.
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07-18-2018, 05:06 PM
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#10
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Junior Member
Thor Owners Club Texas Boomers Club Freightliner Owners Club
Join Date: Aug 2007
Posts: 27
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Quote:
Originally Posted by ScoobyDoo
First thing I would do is let the engine cool down to stone cold, and check the coolant level, in the cooling system, not the expansion tank.
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Sounds like a great thing to check. We will be parked at the campground for awhile, so it is definitely stone cold. I am going to order the ScanGauge D though. The LBCU is low on the instrument panel and obstructed by the steering wheel. I have to peer over the wheel to see it. This will enable me to put the display where I can see it easily.
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07-18-2018, 05:09 PM
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#11
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Junior Member
Thor Owners Club Texas Boomers Club Freightliner Owners Club
Join Date: Aug 2007
Posts: 27
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Quote:
Originally Posted by FIRE UP
Mike,
The port you're speaking of IS THE OBDII port. It's just not shaped and pinned like a standard OBD II port on most automobiles and trucks 'cause the entire system is different than on those vehicles. It's called the J1939 Comm data link port. It's not just for "Scan D" attachments. It's for the techs at Freightliner etc. to plug into for diagnostics on the J1939 Data buss line. That J1939 data link carries ANY and ALL information from your engine ECM, trans TCM, ABS module and, primary and secondary air systems, to what's called the MMDC in the front of the coach. The MMDC (Multi-Module-Data-Computer) deciphers all data from and to, all those components and, then sends it to your gauges for you to read.
And not only that but, there is another J1939 diagnostic port up front too on your coach. It's typically mounted to or, hanging int the area of the fire wall, just to the left of the steering column. It can be a bear to find but, I'll guarantee you, it's there. You can plug in your "Scan D" to that port, not the rear one. A very large percentage of your needs for reading engine ops are already on your LCBU (Light Bar Control Unit) in your dash. You just have to toggle through them to get what you want to read)
Scott
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I was able to find the connector on the firewall to the left of the steering column. I am going to order the ScanGauge D though. The LBCU is low on the instrument panel and obstructed by the steering wheel. I have to peer over the wheel to see it. This will enable me to put the display where I can see it easily. Thanks for your help.
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07-18-2018, 07:28 PM
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#12
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Senior Member
Newmar Owners Club Workhorse Chassis Owner Spartan Chassis
Join Date: May 2010
Location: McAlester Ok
Posts: 2,057
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Sounds very familiar, except I was on flat land. Got it to a repair shop, they put the diagnostic computer on it. I had the cable - sensor for coolant was bad. They couldn’t fix it for serveral days, told me I could drive it home 700 miles. Just watch the engine temp gauge. The light came on, the engine went into limp mode, but we drove it home and had it repaired here.
__________________
2007 Newmar KSDP. 3912
2010 Nissan Frontier SE
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07-18-2018, 08:15 PM
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#13
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Member
Entegra Owners Club
Join Date: Apr 2018
Location: Lubbock Texas
Posts: 46
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You might have a bad coolant sensor in the tank. That is a pretty common problem on trucks.
__________________
2016 Entegra Anthem 44 b
2016 Jeep Grand Cherokee
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07-18-2018, 08:26 PM
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#14
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Senior Member
Monaco Owners Club Oklahoma Boomers Club Retired Fire Service RVer's
Join Date: Aug 2017
Posts: 621
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Your engine would cool faster at idle versus shutting it down. Jim OKC
__________________
Jim & Connie, Edmond Oklahoma
2000 Monaco Signature Classic FD/SO 42' / 1969 VW Bug or 2500HD
"My chains are gone, I've been set free"
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