bed truck Posted January 10, 2015 Share Posted January 10, 2015 ok I am lost, upgrade from a 1979 rd to a 94 ch613. I have had the ch parked for about 3 weeks in 30-35 below wind chill. she started right up after it was plugged in for a couple of hrs. after about three hrs of running I had a loss of power and the electrical malfunction light came on. cleaned the filters out and my power slowly came back but the light hasnt gone off. I ran the codes on the dash and it came up a 6-3. looked up what that was and all it says is j1708/j1587 link. I have no idea what this is lol any help would be great thanks alot Quote Link to comment Share on other sites More sharing options...
Macktech689 Posted January 10, 2015 Share Posted January 10, 2015 J1587 ( aka J1708 ) is the low speed communication link between control modules. If the wiring is damaged and the communication is too slow or missing 6-3 will become active. Check the wires between the modules located behind the kick panel on front of the passenger seat. 1 Quote Link to comment Share on other sites More sharing options...
bed truck Posted January 10, 2015 Author Share Posted January 10, 2015 ok thanks i will check this out, didnt even know there was any electronics on the passenger seat. i quess they could be loose or damaged will check and see thanks alot! Quote Link to comment Share on other sites More sharing options...
bed truck Posted January 10, 2015 Author Share Posted January 10, 2015 ok looked behind the kick panel,not sure what im looking for, where would the module be located? Quote Link to comment Share on other sites More sharing options...
bed truck Posted January 10, 2015 Author Share Posted January 10, 2015 now Im also getting a 6-2 fault code Quote Link to comment Share on other sites More sharing options...
j hancock Posted January 11, 2015 Share Posted January 11, 2015 That is the circuit for turbo speed. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
theakerstwo Posted January 11, 2015 Share Posted January 11, 2015 A 94 year truck would ve a Vmac 1 or maybe VMAC 2 but the turbo speed code would be for a later engine like a ETEC 1 Quote glenn akers Link to comment Share on other sites More sharing options...
bed truck Posted January 11, 2015 Author Share Posted January 11, 2015 not sure, its a new truck to me, i thought it was an e7 400, this is the first issue ive had so far Quote Link to comment Share on other sites More sharing options...
j hancock Posted January 11, 2015 Share Posted January 11, 2015 Yup, that was for VMAC 111.6-2 No proprietary data line input signalhttp://collision.alldata.com/online2help/techRef/Powertrain_Trouble_Code_Charts/Mack/V-MAC.htm 1 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
bed truck Posted January 11, 2015 Author Share Posted January 11, 2015 ok?? how do i fix this problem, do i need to take it to a shop or is it something i can do? Quote Link to comment Share on other sites More sharing options...
Macktech689 Posted January 11, 2015 Share Posted January 11, 2015 Well, with no wiring diagrams or knowledge of the electrical system the best bet would be to take it to a shop with experience in the older versions of VMAC. Good luck! 1 Quote Link to comment Share on other sites More sharing options...
bed truck Posted January 11, 2015 Author Share Posted January 11, 2015 does anyone know where the ecm is located or if i have one. there are only two wires coming off the injection pump into the harness, i assume they go to the electronic pedal, there isnt a ecm on either firewall. i still am getting a 6-2 and 6-3 code on the dash also my cruise isnt working now, frustrated Quote Link to comment Share on other sites More sharing options...
farmer52 Posted January 11, 2015 Share Posted January 11, 2015 ECM is typically under the dash on the right hand side (passenger kick panel). 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
bed truck Posted January 11, 2015 Author Share Posted January 11, 2015 ok thanks i will take a look at the wiring, the nearest shop is about 5 hrs away, if i cant see anything i quess i will limp it there, begining to think i should just stick to my 79 rd much simpler lol Quote Link to comment Share on other sites More sharing options...
j hancock Posted January 11, 2015 Share Posted January 11, 2015 Loose pin connections and even the tiniest bit of corrosion in the electrical system will give you plenty of grief. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
bed truck Posted January 11, 2015 Author Share Posted January 11, 2015 ok talked with a mechanic that has several of the same trucks. he said to check the turbo clamp, i did, had a worn exhaust pipe and the clamp was loose leaking exhaust, no oil leaks from the turbo. when the parts house open tomorrow this is what i will try. he told me that this issue will throw the same codes and cause loss of power. crossing my fingers thanks for the help i will update tomorrow. Quote Link to comment Share on other sites More sharing options...
wheeler73 Posted January 12, 2015 Share Posted January 12, 2015 The exhaust leak will not be your issue. The only issue the exhaust leak at the outlet pipe will have is low exhaust temp. It will not cause data link codes. 1 Quote Link to comment Share on other sites More sharing options...
bed truck Posted January 12, 2015 Author Share Posted January 12, 2015 kind of what i was figuring, needs to be fixed anyway, i will check on the intake side for loose connections if not will have to limp it the five hrs to a shop i give up Quote Link to comment Share on other sites More sharing options...
bed truck Posted January 16, 2015 Author Share Posted January 16, 2015 ok, back from the shop, simple fix, a fuse that looked good but tested bad was replaced. problem with wiring is sometimes the simplest issue is overlooked, sometimes you have too p..ay for the education. back to work now Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted January 16, 2015 Share Posted January 16, 2015 Thanks for following up with your solution Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
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