dependable dirt Posted May 11 Share Posted May 11 I need to find out if my t2180 has a tourqe limit switch but I have no idea what one looks like any help would be great. Truck feels like it is in derate Quote Link to comment Share on other sites More sharing options...
fjh Posted May 11 Share Posted May 11 Its on top of the Cylinder on the top rear of the trans! Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 11 Author Share Posted May 11 I haven't been able to find anything. Do you have a picture of what the switch looks like Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 11 Author Share Posted May 11 I have been searching and searching for the problem on this truck it's a 96 ch e7 454, throws blink code 4-2 I changed the speed sensor , didn't help at all. I have no tach no speedometer, but if I start truck and pull seedo circuit breaker the light goes out and stays off but I have not been able to test drive to see if it got the power back .. only gets about 15 psi boost and the boost needle shudders to get that . It runs fine no miss or anything just no top end power Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 11 Author Share Posted May 11 45 minutes ago, dependable dirt said: I have been searching and searching for the problem on this truck it's a 96 ch e7 454, throws blink code 4-2 I changed the speed sensor , didn't help at all. I have no tach no speedometer, but if I start truck and pull seedo circuit breaker the light goes out and stays off but I have not been able to test drive to see if it got the power back .. only gets about 15 psi boost and the boost needle shudders to get that . It runs fine no miss or anything just no top end power I just went out and looked the only thing on top of that cylinder at the back of the trans is a air line . No sensor, is there a chance that this truck does not have a torque limit switch Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 11 Author Share Posted May 11 I am not sure how to attack the speed sensor as I have traced wire up to where it meets main harness no issues, can the 4-2 blink code cause derate. I have dash and kick panel removed I can see most of the wiring but it is still bundled tight. I have not started cutting all the zip tie and investigated every wire Quote Link to comment Share on other sites More sharing options...
fjh Posted May 12 Share Posted May 12 Yes no speedo can derate too! Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 13 Author Share Posted May 13 So I feel that I am going to need to trace wires for speed sensor, does anyone know which wire it would be at the ecu Quote Link to comment Share on other sites More sharing options...
fjh Posted May 13 Share Posted May 13 Can't help there! Sorry! Joey you got a wiring chart?! Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 13 Share Posted May 13 I may, i can look in my V-MAC II book after work.. Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 14 Author Share Posted May 14 I guess it is a vmac 1 because it has two modules in the glovebox\fusebox kick panel Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 Do you have a duetch plug on the back of the injection pump? Another way to tell, is when you turn the engine off, does all of the dash power turn of instantly, or is there a 7 second delay? 1 Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 14 Author Share Posted May 14 Turns off right away and under washer fluid tank rectangular wire block Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 14 Author Share Posted May 14 I'll take a pic and post when I get home Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 all good, you have V-MAC I... Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 what chassis do yuo have? i assume CH-613... I am trying to post pictures, I have to creat a link. my new phone is not too smart Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 https://photos.app.goo.gl/bHfxdEwquA84j1n16 tell me if the linky no worky.. Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 14 Author Share Posted May 14 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 check my link.. i have more pics to send Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 https://photos.app.goo.gl/AHKrmPRucm8eYgVj8... I have dia grams in my shop but cant get to them right now.. they are large Mack printings. However, you should be able to use the info I posted to find the wire(s).. Jojo Quote Link to comment Share on other sites More sharing options...
dependable dirt Posted May 14 Author Share Posted May 14 Thank you. I didn't see much on the speed sensor. I couldn't find a tourque limit switch on this truck so I am leaning to 4-2 code being culprit, I have no tach and no speedometer working on dash. I replaced speed sensor and it did not work . So I am hunting for a wire short with the speed sensor I checked the back of dash cluster not visible issues there Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 remove the speed sensor and see if its cracked. when you put it back in, go all the way in lightly touching the tone ring, then back it out 1 full turn. ohm the sensor and post the reading. I will check it in the book, im busy, so I may be slow to respond.. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 14 Share Posted May 14 4-2 is an open circuit.. (broken wire).. 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted May 15 Share Posted May 15 14 hours ago, Joey Mack said: 4-2 is an open circuit.. (broken wire).. Its relatively easy to get the floor out why not pull and trace that section anyway! pull the hatch Lots of room to look then long as there's not controls bolted to it! 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted May 15 Share Posted May 15 FJH, i dont have simple diagrams, i have the big fold out ones that you get from Mack Schools. Im hoping the info i posted from my V-Mac 1 book will get him what he needs 1 Quote Link to comment Share on other sites More sharing options...
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