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Hi everyone, really hoping someone can help me with an issue ive been having! Ive been battling this for a while not with my 2001 300GT (VQ300DD). I have a constant current draw on my battery which drains it if I leave the terminals connected for a more than a few days, battery seems fine if I just unplug it whenever im not using it I disconnected negative terminal and measured current draw across the battery with everything off and it is ~400mA. I understand this should be closer to ~50mA. I trawled the internet for wiring diagrams and the only one I could find was a Russian version, ive attached a screenshot below and labelled what I think are relevant sections. I pulled fuses and discovered the issue with the 15A fuse that controls quite a few components.. From the fuse I went to the relay labelled 1 located in the IPDM cluster and put a jumper across coil terminals first and then relay terms. I discovered that the fault was on the relay circuit and not the coil circuit, this lead me to believe that the issue could lie with the components labelled as group 3 below. Im realising now that group 2 is off this circuit as well which I haven't checked.. Group 3 consists of MAF sensor, camshaft position sensors and crank shaft sensor. I pulled all the wire harnesses on these but did not see any change in current draw so concluded these to not be the issue. I then unplugged the ECCS labelled 4 and the current dropped to ~130mA From here Im not too sure how to proceed, does this mean my ECU is bad or could it be any other device connected to the ECU?? Im reluctant to buy a replacement ECU before being certain I know where the fault lies.. Im also curious as the current draw is still slightly higher than expected.. Any help would be greatly appreciated! Thanks in advance!
