Hope someone can help me. I have a 2006 Volvo VNL 670 with D12, Eaton Fuller shifter attached to the seat. I cant find any info on what speed the tranny is. There is only a throttle and brake pedal. I recently bought the truck with a bad ECM. Truck would crank but not start. Ordered a reman ECM and the truck would run. Go into gear with no issues. Then, the trans controller would not turn off when I shut the truck off. Disconnected the batteries, replaced the two fuse holders, fuses and associated wiring. Replaced the ignition switch, still the controller would stay on. I disconnected the batteries again and now, the controller wont come on. Fuses in the battery box are good. Batteries are new. Went back to my original ignition switch and still wont come on when I turn the key on. Ive checked all the fuses and relays in the center of the dash. One other thing, when I turn the key off from the ignition being on, after about 10 seconds of turning the key off, the service light in the controller will flash once. Im also not getting any communication with the TCM when I try to retrieve the codes. This thing has me stumped! Any help would be greatly appreciated! Thanks!
Crawl under the truck, and find the data plate on the transmission, Eatons usually have that plate on the passenger side of the transmission.
Eaton trans models decoded R =Roadranger T= twin countershaft O=Overdrive 1st 2 digits are nominal torque x 100 3 digit is series Last 2 digits are number of forward speeds The letter is the ratio designation. so what you have is a 10 speed
By the sounds of thing the TCM probably isn't getting power, power feed to it would be part of the Volvo harness. I haven't worked on any Volvo's with the eaton but plenty of paccars with them, and on them are common to have power feed wring issues to the TCM (typically rubs through where it comes over/under the frame or on the trans housing itself.) You have a ultrashift DM(gen3) 10 speed transmission. If you google TRTS0930 you will find the troubleshooting manual for your transmission from the eaton website, and TRSM0930 is the service manual. Trouble shooting the issue you have will require a good multi-meter to do continuity checks, and other tests, and quite a bit of patience to go through checking everything.
Thanks bjytech! Ill download the manuals and see where it takes me. Ive got a good Fluke multimeter. Hopefully its something obvious and not the TCM. Thanks again!
I done some research previously that bad grounds could cause problems like this. Has anyone else run across this?
