You can unplug, check for green fuzzy, clean seal and reconnect plugs. Anybody else want to chime in? Could this be as simple as a programming issue in the master gauge? Seems like if there was a break in the main main line, your be having so many other issues that the bus would be all but inoperable. That said, if you decide to proceed, I would think the problem would have to be ths node (between the) ABS controller and the main chassis harness up in the frame rail. I don't know how to say this and not sound like a total di**, but if you don't even know what J1939 is, you aren't the guy to attempt to repair it. Where is the location of these wires? Would it most likely be a short in that region of the harness? As far as purchasing the scan tool, there are extenuating circumstances as to why I can't or shouldn't purchase it. A twisted pair of green and yellow wire are the backbone. It's the data line that links engine, transmission, brakes, etc. J1939 isn't a module but the electronic backbone of the bus. All it does is plug into the diagnostic plug in down and to the left of the steering wheel. I am not that familiar with the J1939 but I know the tool will guide you to a problem sometimes. I'm not too familiar with J1939 issues though perhaps you could enlighten me. I was able to find a schematic on the abs system and discovered that there is an interface in between the module and the frame harness but I'm stumped as to where it's located. No unfortunately our shop doesn't have a bendix diagnostic tool so I'm having to solve this the "old fashioned way". Do you have any diagnostic information for J1939?ĭo you have a Bendix 8U1869 remote diagnostic tool? This should tell you where to go look for a problem. Any time I have experienced any type of "COMM FAIL" on a BB, it is a J1939 problem. If anyone has any insight on this I would appreciate it. The front leaf springs were changed recently so I'm guessing whoever did that missed plugging something in on the main harness. I tried unplugging an abs sensor and the light on the dash doesn't come on. I have checked any relevant fuses and relays, the plugs and pins to the module are fine, the module itself is fine, the plugs and pins to the ECM are fine. The only thing that hints to the problem is in the message center under the odometer it reads "ABS COMM FAIL". The abs light comes on during initial startup just as its supposed to then goes off. I am currently working on a 2006 BlueBird All American with front mounted C7 CAT and equipped with Bendix Air.
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