jgosse01 Posted November 21, 2022 Share Posted November 21, 2022 Does anyone know what this code is "VECU 40 -4"? Does anyone have a good fuse panel diagram for this model? Runs great at idle, after driving for a couple mins it looses throttle control but stays running. I now VECU controls vehicle speed. It throws a 84-9 vehicle speed code. has brand new speed sensor. Also noticed coolant gauge goes in and out but has new temp sensor and the digital display is reading correctly. I believe it is all related to the VECU any help would be appreciated!!! Quote Link to comment Share on other sites More sharing options...
fjh Posted November 21, 2022 Share Posted November 21, 2022 More info please Manual trans ? ! DELETED ? Maybe a standard derate for the coolant Temp Quote Link to comment Share on other sites More sharing options...
jgosse01 Posted November 21, 2022 Author Share Posted November 21, 2022 Eaton 10spd, yes deleted. why would the digital display read correct temp but gauge does not??? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted November 21, 2022 Share Posted November 21, 2022 1 Quote Link to comment Share on other sites More sharing options...
fjh Posted November 22, 2022 Share Posted November 22, 2022 13 minutes ago, jgosse01 said: Eaton 10spd, yes deleted. why would the digital display read correct temp but gauge does not??? Good question! not sure Real hard to call stuff on a deleted engine! your 6 count there is likley the delete doing those two! the temp is the only thing that Could upset the apple cart there! 1 Quote Link to comment Share on other sites More sharing options...
jgosse01 Posted November 22, 2022 Author Share Posted November 22, 2022 We have 9 Macks all running the same DELETE by the same person. Im just not familiar with Macks and Volvos. Ive never heard of coolant temp causing derate, normally coolant issue causes shut down to protect the engine. Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted November 22, 2022 Share Posted November 22, 2022 (edited) An ABS light can cause a derate Edited November 22, 2022 by Onyx610 1 Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 6 minutes ago, Onyx610 said: An ABS light will cause a derate you are kidding ! right.an ABS light (system issue) will derate an engine? that abs crap FIRST came out == yes i was there then also.LOL no one knew the system and drivers didn't like seeing the light so tape was put over it. the engine still ran as expected. what happens if a driver farts in the cab;; does the computer sense excess gas in cab area and derate engine !! 2 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted November 22, 2022 Share Posted November 22, 2022 There is a differential pressure sensor in the cab that measures the output of the heater fan related to how far the windows may be open, divided by barometric pressure, plus the exterior wind speed that calculates the pressure difference when a steering wheel holder "Off Gas's" his Sushi lunch and herbal tea... Then the cab NoX sensor will calculate how much greenhouse gas is in the off gasing, and determine how much more the door windows need to be adjusted, so as to not affect the Metasphere... Its easy to understand if you take a minute.. Just sayin'..... Jojo 2 Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 I don't think the highly respected and HONORED WWII veterans can understand this post AND THEY WERE CODE TALKERS . just sayin 1 Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted November 22, 2022 Share Posted November 22, 2022 ABS can derate the engine if there is discrepancy between wheel speed at the ABS sensors and at the road speed sensor Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 3 minutes ago, Joey Mack said: There is a differential pressure sensor in the cab that measures the output of the heater fan related to how far the windows may be open, divided by barometric pressure, plus the exterior wind speed that calculates the pressure difference when a steering wheel holder "Off Gas's" his Sushi lunch and herbal tea... Then the cab NoX sensor will calculate how much greenhouse gas is in the off gasing, and determine how much more the door windows need to be adjusted, so as to not affect the Metasphere... Its easy to understand if you take a minute.. Just sayin'..... Jojo NOW HOW DID YOU GET PERMISSION TO TAKE MY WIFE'S PLACE AND BREAK MY BA-LS lol😂 1 Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 did it again guess;; went off topic. JOJO , how long did it take to figure that reply' i'm all out of likes again. i keep reading the reply : you know i can't afford alot of laughter , start coughing. this case it's worth it. wife thinks i m insane (still). 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted November 22, 2022 Share Posted November 22, 2022 I just went off.... I am a sarcastic bastard when it comes to our Gov. controlled trucks.. So I choose to poke fun at them... Quote Link to comment Share on other sites More sharing options...
Mackpro Posted November 22, 2022 Share Posted November 22, 2022 As Onxy said the ABS and ATC system can cause dead throttle pedal issues. I thought it was only on the M-drive trans trucks but also happens on outer manual trans trucks . It was throw a Speedo sensor code as well. 1 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted November 22, 2022 Share Posted November 22, 2022 On our trucks this sometimes happens when it rains or we wash the trucks. The rubbed bare wires in the frame rails seem to short out more easily when it rains or wet. 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted November 22, 2022 Share Posted November 22, 2022 The VECU code PSID40 FMI 4 is for your daytime running light module missing from the fuse panel. Lots of drivers pull them out and throw them away for some reason. 1 Quote Link to comment Share on other sites More sharing options...
mechohaulic Posted November 22, 2022 Share Posted November 22, 2022 20 hours ago, Mackpro said: On our trucks this sometimes happens when it rains or we wash the trucks. The rubbed bare wires in the frame rails seem to short out more easily when it rains or wet. now if they were B models ; the only wires in the frame rails that could /would short out would be for the TWO tail lights. first seeing a western that had low level sensors for the rear ends was really some thing back then. Quote Link to comment Share on other sites More sharing options...
jgosse01 Posted November 23, 2022 Author Share Posted November 23, 2022 22 hours ago, Mackpro said: As Onxy said the ABS and ATC system can cause dead throttle pedal issues. I thought it was only on the M-drive trans trucks but also happens on outer manual trans trucks . It was throw a Speedo sensor code as well. The ATC light does constantly stay on in this truck. I will check more into this thank you. 1 Quote Link to comment Share on other sites More sharing options...
Onyx610 Posted November 23, 2022 Share Posted November 23, 2022 14 minutes ago, jgosse01 said: The ATC light does constantly stay on in this truck. I will check more into this thank you. Good to know, that may be your issue. Let us know please. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.