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Not sure. I'm gettin A J1939 Failure but no other PID OR…

Customer Question
Not sure. I'm gettin...

Not sure. I'm gettin A J1939 Failure but no other PID OR PPID OR SID CODES. Just J1939 failure. Not sure if its the can bus harness or the ECM that's gone bad. I thought it might br either the ign buss relay (4 pin high amp) or the ACC bus relay. (Also high amp)

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2011 KW T660 Cat C13. 430 ACERT Engine.

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

Trucj shut down while goin down the hwy! Truck would sit for 15 to 20 minutes then fire up. Wouuld run between 13 and 16 minutes before another shutdown. I have full electrical everywhere but on the digital display it only displays dashes. (Will not start then) after setting a while I'll turn key on and after it does the p.o.s.t. cycle it would display the numbers for miles hours temp and trip miles. Now (this morning) it will not cycle and the display information does not show. But it does show (briefly) when thekey us shut off. Or door is opened/closed

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Thanks

Submitted: 8 months ago.Category: Medium and Heavy Trucks
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Answered in 12 minutes by:
12/17/2017
Technician: roybelding, Shop Foreman Freightliner trucks replied 8 months ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 7,912
Experience: Shop Froeman for Freightliner Trucks
Verified

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 8 months ago

good morning

the first thing I would do is verify your batteries are good. you need to do a load test on each to be sure they are good. the ecm needs at least 12.2 volts to perform.

also, check all the terminal connection as well.

low voltage is a very common issue for J1939 codes

Roy

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Customer reply replied 8 months ago
Just put 4 new batteries and and Altenator on the truck. New cables to the the main battery terminals (jump posts) voltage shows 13.7 + truck shut down driving down hwy! Reset after a few minutes then restarts/runs for about 16 minutes then shuts down. That wa yesterday. Today; no cycling of power works. Dud not have J1o939 failure show up yesterday. Today its tgere and won't start.
Technician: roybelding, Shop Foreman Freightliner trucks replied 8 months ago

when it does not start, does the truck crank over???

Roy

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Customer reply replied 8 months ago
Full crank (no fire though)
Technician: roybelding, Shop Foreman Freightliner trucks replied 8 months ago

ok, the first thing I would do is remove the connectors at the ecm and check them for dirt or dmagaed pins. make sure the pins are clean and tight.

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 8 months ago

any update???

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Technician: roybelding, Shop Foreman Freightliner trucks replied 8 months ago

do you need any other help??

Please take a moment and rate my service 3 stars or better. that is the only way the site will pay me for my efforts.

Roy

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