![]() ![]() We've already looked at replacing it with a new ECM. ![]() Afterr all, he has to pay for the ECM and presumably pay you something for your time. Then.let the owner ( your friend) and owner of the car decide which way to go with the repair. Quote 2: a brand new ECM for the VIN number on your customer's car. So assuming that you find the code for the ECM, how can you be sure that the ECM purchaced from e-bay is fully functional? In my opinion, I would make a trip to the dealer, and get a quote from them for: Quote 1: Complete Repair / replacement of the ECM, and Test Fuctionality of car. Gumby75, you said Quote: ' I don't want to waste time, effort and money on a replacement ECM that won't work for this car.' So along that though process.I offer my humble advice: If it were me, I would be over my head in this problem, so I would be thinking worst case senario / and ouotcome. So can somebody please break down these last 4 digits for me? If they mean nothing, all the better - but if I need to look for specific replacements, obviously that's useful to know. I saw '3Y12' and '3826' as examples - I even found one that had '3X28' on it - but without knowing what those numbers are supposed to mean, I don't want to chance buying the wrong one. The current serial number on this ECM is: MEC35-020 D3 3X29 Almost every ECM I find listed on ebay has the 'MEC35-020 D3' on it, but the last 4 digits vary greatly. I've found all kinds of 'matches' on ebay, but without being certain about what the serial number means, I don't want to waste time, effort and money on a replacement ECM that won't work for this car. What I'm curious about is the decoding of the ECM serial number. What is a VIN? The VIN is the 'Vehicle Identification Number' for your automobile or truck. Nissan VIN, Model Line and Engine Decoding Nissan VIN, Engine and Model Decoder. As far as I can tell, the ECM is receiving every signal and source voltage it's supposed to 'see' to start and run the engine, but it's not working ergo, I'm replacing the ECM. ![]() The ECM connector is in good shape and there's no evidence to indicate loose or broken connections. I've confirmed good battery power to the ECM via all appropriate pins & ignition switch positions as well as good ground connections. After further testing, I confirmed the ECM was not commanding the throttle motor relay to turn on and supply power to the throttle control motor. It was originally a crank/no start problem - only codes present were P1122 & P1126 for the throttle control motor circuit. Hello: I have a friends 2004 altima 2.5L that I'm replacing the ECM on. ![]()
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