K40 relay circuit and associated - Mercedes-Benz Forum - I'd (and feature) advocate your web page to others i was quite happy with the first-class of the records acquired, the professional with whom i interacted, and the short response time. Thanks, and make sure that i'll be back each time i want a query answered in a hurry. Used your service this weekend with "trecers" assist. Thanks ,thank you, thanks. Changed an a/c fan motor. Neighborhood vehicle region had component. $15.00 "tracer" price and $forty.00 for elements, i stored several masses of dollers at a store. I'm able to recommend you and use you within the destiny. The primary relay should be for the fuel pump and the second relay is circuit 87 which is what powers up the engine pc once a valid key is inserted. While you press the second relay touch, you're essentially bypassing the security machine. The notorious k40 overload protection unit is a 9aaf3f374c58e8c9dcdd1ebf10256fa5 motive of starting, idling, and engine stumbling issues. This unit gives voltage to the manipulate modules and electrical components, such as the gas pump, electric air pump, and horn. While the k40 malfunctions, those additives don't get their required voltage. Disclaimer: records in questions, answers, and different posts in this web page ("posts") comes from person users, no longer justanswer; justanswer isn't always accountable for posts. Posts are for fashionable records, aren't intended to substitute for informed expert recommendation (medical, criminal, veterinary, economic, and so forth.), Or to establish a professional-client relationship. The website online and offerings are furnished "as is" and not using a assurance or representations by using justanswer regarding the qualifications of professionals. To peer what credentials were proven by means of a third-birthday celebration service, please click on at the "validated" symbol in some professionals' profiles. Justanswer isn't always supposed or designed for emergency questions which should be directed right now by using telephone or in-man or woman to certified professionals.
I can get around the pump relay buy putting the wires into a stand by myself relay and will do the equal on the first relay if i new what it turned into for. Regarded on ebay for a brand new k40 however not anything there and mb need a small fortune for one. Nicely the engine laptop actually sends the signal to activate the gas pump relay. The engine computer needs the circuit 87 relay signal to even switch on so that 2nd relay you are pushing have to just be for the gas pump. Do you have got a wiring diagram on a pdf i ought to perhaps trace the wires again. The first relay doen't paintings once i put energy throughout it out of the automobile just like the 2nd however the different 3 do. The whole problem could simply be in the k40 relay. Have you ever unfolded the k40 unit and checked the circuit board for solder reduce? If no longer then i'd take a look at that first. I will connect a picture of what to look for.