bigredhdt Posted July 13, 2023 Report Share Posted July 13, 2023 Power to the truck was disconnected for some time for service work. After reconnecting, truck has rough idle, will not engage throttle. I do a diagnostic on the engine ecm and it fails to communicate. Any idea of what to try? Quote Link to comment Share on other sites More sharing options...
Wrknrvr Posted July 13, 2023 Report Share Posted July 13, 2023 What engine do you have. That will get us started on diagnosing your situation. Are your batteries charging from the engine. Quote Link to comment Share on other sites More sharing options...
rickeieio Posted July 13, 2023 Report Share Posted July 13, 2023 Vern, read the title. 😉 Quote KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
Parrformance Posted July 13, 2023 Report Share Posted July 13, 2023 I would start at the two connections at the ECM, and the 12 volt and ground connections at the batteries. The ECM wants good clean 12 volts and grounds to operate correctly. 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...
bigredhdt Posted July 13, 2023 Author Report Share Posted July 13, 2023 I've pulled the connections and looked/cleaned them with no change. Would you recommend I cut off the existing ring terminal and put on a new one? Replace the fuse holder on the engine ecm feed? Quote Link to comment Share on other sites More sharing options...
Parrformance Posted July 13, 2023 Report Share Posted July 13, 2023 I would want to make quite certain the ring terminals were in great shape. Did you happen to also clean the corresponding ground wires as well? You will also want to retrace the steps that were done during the extended service. 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...
rickeieio Posted July 13, 2023 Report Share Posted July 13, 2023 Measure to see if the voltage at the source is the same as the voltage at the ecm. Same with the ground. Only a very slight difference (voltage drop) is acceptable. For example, read the voltage across the battery terminals, and again across the ecm terminals. Any difference more the a couple tenths/volt is indicating a poor connection. Quote KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
bigredhdt Posted July 13, 2023 Author Report Share Posted July 13, 2023 Where do I measure the voltage at the ecm? Quote Link to comment Share on other sites More sharing options...
Wrknrvr Posted July 13, 2023 Report Share Posted July 13, 2023 I am tired. Working on our Cummins n14. Just got another. Rebuilt ecm this am Was desperate for a wiring harness. Ordered one yesterday. But there is no record of it in existence at the parts place. Ordered from Flagstaff. Called them It is none existent in our system the parts person said. Parts place just called. Said it would be there by 10:30 am..... I have another one to be delivered tomorrow also. Slow down and read, I will. I will. Once I Rest up Vern Quote Link to comment Share on other sites More sharing options...
bigredhdt Posted July 13, 2023 Author Report Share Posted July 13, 2023 Rick, you know of any good mobile truck repair services in our area? I'm in Okeana, OH, not too far from Harrison, oh. Quote Link to comment Share on other sites More sharing options...
Parrformance Posted July 13, 2023 Report Share Posted July 13, 2023 What service was just performed? likely better to start there then start searching voltages. 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...
rickeieio Posted July 13, 2023 Report Share Posted July 13, 2023 1 hour ago, bigredhdt said: Rick, you know of any good mobile truck repair services in our area? I'm in Okeana, OH, not too far from Harrison, oh. There's Jerry's Truck and Diesel on Kilby. 513-367-2502 I think. I'd call Engel's Towing up in Colerain and ask for a recommendation. Jimmy or his dad, Jim, will steer you right. That said, I'm no meckenik, but I enjoy a challenge. Will you be around Friday or Saturday? I need to run to Harrison anyway, so I'll be half way there. Call me. 513-284-6927. If I don't answer, leave a message. Quote KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
lappir Posted July 14, 2023 Report Share Posted July 14, 2023 If you haven't changed the oil soaked harness to the ecm, I'm betting it's the culprit. Not an inexpensive fix. Similar to what SuiteSuccess just went through. Mine was a couple of summers ago. Rod Quote White 2000/2010Volvo VNL 770 with 7' Drom box with opposing doors, JOST slider hitch. 600 HP Cummins Signature 18 Speed three pedal auto shift. 1999 Isuzu VehiCross retired to a sticks and bricks garage. Brought out of storage the summer of 2022 2022 Jeep Wrangler Sport S Two door hard top. 2007 Honda GL 1800 2013 Space Craft Mfg S420 Custom built Toyhauler The Gold Volvo is still running and being emptied in July. Link to comment Share on other sites More sharing options...
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