Jon Sawicki Posted December 10, 2015 Share Posted December 10, 2015 I have an 03 Vision that fires right up but wont get out of its own way. I know it has something to do with the speedo not working and putting the engine in limp mode. I am trying to find a diagram or figure out where the speedo wires come and go to. It is a new sensor. any help is appreciated. I do not have access toV-Mac Software Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/ Share on other sites More sharing options...
razorback11 Posted December 10, 2015 Share Posted December 10, 2015 I hate it when your Speedo fails! Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315063 Share on other sites More sharing options...
bbigrig Posted December 10, 2015 Share Posted December 10, 2015 It's fairly common to have those issues when your speed sensor at the trans output shaft fails. This possible fault could be confirmed through diagnosis on V-mac. Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315065 Share on other sites More sharing options...
Challenger Posted December 10, 2015 Share Posted December 10, 2015 Did you adjust the sensor when you installed it?Turn the sensor in until it bottoms out, then back the sensor out a 1/2-3/4 turn. Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315114 Share on other sites More sharing options...
Jon Sawicki Posted December 10, 2015 Author Share Posted December 10, 2015 yes I have installed the new sensor correctly, I checked the wires for power and I have none. only 1 wire grounds out off the plug. the harness at one point was cut away near the plug, could it be possible that it shorted out the ecu circuit? Is there maybe a way to bypass the speed circuit so that I am able to build boost and actually be able to get out of my own way? Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315139 Share on other sites More sharing options...
wheeler73 Posted December 11, 2015 Share Posted December 11, 2015 A dealer will need to go into customer parameters and set power for failed and no speedometer to 100% and you will then have full power. Hopefully you have a good dealer that knows how to program VMACIII as most of the younger techs have no idea how to change parameters or program VMACIII as it is now considered in the dealer world as obsolete for the most part. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315181 Share on other sites More sharing options...
Jon Sawicki Posted December 11, 2015 Author Share Posted December 11, 2015 thank you wheeler73 Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315202 Share on other sites More sharing options...
wheeler73 Posted December 12, 2015 Share Posted December 12, 2015 No problem. If you were closer I could do it for you. Unfortunately the dealers and Mack do not teach the old stuff anymore. So hopefully you have a dealer with a tech that knows. Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315333 Share on other sites More sharing options...
turckster Posted December 12, 2015 Share Posted December 12, 2015 Its a crude version of a diagram but it works: 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315342 Share on other sites More sharing options...
Jon Sawicki Posted December 12, 2015 Author Share Posted December 12, 2015 I appreciate the diagram turckster it will help a lot and I used to be a Mack technician and was trained on V-mac III software, however I dont have access to it and my local Mack dealer...boy they are some weird people lol 1 Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315399 Share on other sites More sharing options...
Challenger Posted December 12, 2015 Share Posted December 12, 2015 I appreciate the diagram turckster it will help a lot and I used to be a Mack technician and was trained on V-mac III software, however I dont have access to it and my local Mack dealer...boy they are some weird people lolTransEdge has solid technicians. Looks like Hamlin is north of Allentown. Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315410 Share on other sites More sharing options...
Jon Sawicki Posted December 13, 2015 Author Share Posted December 13, 2015 yes about 11/2 - 2 hrs north Quote Link to comment https://www.bigmacktrucks.com/topic/43035-03-vision-no-speedo/#findComment-315516 Share on other sites More sharing options...
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