Parrformance Posted October 17, 2020 Report Share Posted October 17, 2020 New issue with the VNL 780, I have a check ECU at next stop warning. When investigating on the dash, it shows engine fan electrical fault. Fan of course is running all the time. Plan to tackle this next weekend when we get home. I will start with connections along the frame rails at the solenoid. Should I look for anything else in particular? Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
alan0043 Posted October 17, 2020 Report Share Posted October 17, 2020 Hi Parr, Sorry I can't help you but I to follow your progress so I can learn. Wish you the best the the repairs. Al Quote 2012 Volvo VNL 630 w/ I-Shift; D13 engine; " Veeger " Redwood, model 3401R ; 5th Wheel Trailer, " Dead Wood " 2006 Smart Car " Killer Frog " Link to comment Share on other sites More sharing options...
NeverEasy Posted October 18, 2020 Report Share Posted October 18, 2020 Check fuses. On my Gen 1, the fuse blew and kept blowing. I ohmed the solenoid coil and it looked good. I put on a new air solenoid anyway but it still blew. I ended up putting in a 12 V relay close to the solenoid and used the normal signal to the solenoid as a control voltage. I fused the relay source voltage at the same amperage as the one in the dash. It did not blow that fuse. Magic! Quote Chet & Deb '01 Volvo 660 w/ Smart '19 Forest River Columbus 320RS 5th wheel 2022 Chev 2500HD Long Bed Retired CWO4, USN and federal service Electronics Tech/Network Engineer/Welder/Machinist Link to comment Share on other sites More sharing options...
Parrformance Posted October 18, 2020 Author Report Share Posted October 18, 2020 Thanks, that sounds doable. Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
Parrformance Posted October 20, 2020 Author Report Share Posted October 20, 2020 Started by checking code: MID128 SID33 FMI3 Fan control high voltage or shorted. Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
Parrformance Posted October 31, 2020 Author Report Share Posted October 31, 2020 (edited) Fan control valve, and more specifically the Volvo pigtail were badly worn/corroded. I replaced the valve and the pigtail and the fan is operating correctly again. Edited October 31, 2020 by Parrformance Spelling correction Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift 2003 Jeep Wrangler Rubicon 2010 Forest River Coachman Freedom Express 280RLS Jackalopee Link to comment Share on other sites More sharing options...
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