AFACE Posted December 23, 2023 Share Posted December 23, 2023 Have a truck with the 427 that got pressure washed and the jake quit working. Have signal coming from the vecu but nothing else. Can anyone tell me where the engine brake disable relay is located. I have a good diagram but can't seem to find the component. Any good tips for tracking this one down, I can apply power to jakes and they will work. Has jacobs brake. Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/ Share on other sites More sharing options...
Joey Mack Posted December 23, 2023 Share Posted December 23, 2023 do you have an injection pump or 6 EUP's? Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-543989 Share on other sites More sharing options...
JoeH Posted December 23, 2023 Share Posted December 23, 2023 Has signal coming from the VECU, I'm gonna assume it's a Vmac III. Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-543993 Share on other sites More sharing options...
Joey Mack Posted December 23, 2023 Share Posted December 23, 2023 yeah, kind of a safe bet.. I always ask dumb questions, because every once in a while, the 'poster' doesnt know what he has.. I wonder how aggressive the pressure washer guy was? whats the chances he blew the 2 plugs of the posts in the jake spacers?? Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-543994 Share on other sites More sharing options...
Popular Post JoeH Posted December 24, 2023 Popular Post Share Posted December 24, 2023 Says he can apply power to the Jake and it works... What's the vmac III use for brake control? Throttle signal through the pedal and a clutch mounted switch? Maybe it's got nothing to do with pressure washing and the clutch switch is buggered or got tweaked coincidentally. 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-544000 Share on other sites More sharing options...
AFACE Posted December 26, 2023 Author Share Posted December 26, 2023 Sorry for the late response holidays suck sometimes. It is the vmac, has a new clutch switch, and not sure how aggressive the wash was. Jake worked for a split second and wont come on now. Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-544124 Share on other sites More sharing options...
Joey Mack Posted December 26, 2023 Share Posted December 26, 2023 what model and year is the truck? the relay is probably a cube type, near the fuse panel in the cab. I assume you have a CH or CX model.. Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-544126 Share on other sites More sharing options...
Mbelyan Posted February 26 Share Posted February 26 I have a 2001 E7-460xt, I had no high idle and the jake would not work, it turns out it was linked to a bad ABS sensor, appearently its tied into the traction control system on that truck, if thats of any help to you. Quote Link to comment https://www.bigmacktrucks.com/topic/73684-e7-427-no-jake/#findComment-547202 Share on other sites More sharing options...
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