Ecu Has No Power!

[Lukas 33]

Hey guys I was wondering if you can help me out. I am in the process of finishing my engine off. I just put in a 25/30 and im connecting everything back up and getting it ready for its first start. HOWEVER. There is a nice thick black wire with a yellow stripe (just underneath all the wiring near the washer bottle) and I am wondering what exactly it does and where I need to connect it to. Im guessing it is the earth for the block but I'm not 100% sure and also not 100% sure about where exactly to put it. I have also just put in a Microtech LT12S.....(bag it out if you wish but its what I was recommended due to the tuners in Townsville....)..anyways. I have just put the ECU in and when I went to set the injector correction the hand controller didnt come on. So I had a look down at the ecu and it appears to have nooooooooooo power. Could this be from the mysterious black wire which I have no idea where it goes? All help is appreciated

Cheers

[Lukas 33]

Come on guys. Im lost

[PM-R33]

Hey man, you are correct. The yellow and black wire is an earth strap and it bolts to the right of the engine mount. (not really important where you mount it as long as it is a good earth point on the block).

I dont however think this is your problem as the ECU would still get power regardless. Check over all your wiring into the Microtech and use a test light to make sure the ECU is getting power into all the pins it is supposed to.

[Keeper]

I had same problem the other day on my R32 GTR, two large rectangular connecters near the washer bottom supply battery to the ECU, weird it goes that way round. Check them.

[Lukas 33]

Cheers guys I have today off so I will go work on the car some more and connect up that lead. If still no power I think I will just check the ecu harness. If anyone would know off the top of their head.......is the pin number for the main battery power supply to the ecu pin number 58?

Cheers

[Lukas 33]

I just connected it to the block just then but still no power

[Lukas 33]

Ok I went and got a fuse box translation and pulled out the Engine Control 10A fuse to see if it was blown. Yes it was blown. I figured I could have accidently done something so I put the 10A fuse from the hazard lights in there. I connected the battery back up and turned the key. The hand controller for the ECUs screen light up and immediately turned off again. Disconnected the battery to check the fuse I just put in and it was f**ked too . OH O. Is the ECU drawing too much power or do I have a nice short circuit happening somewhere?

Cheers

[Lukas 33]

Could the ECU fuse be blowing from short circuiting from the coil packs, injectors or fuel pump and such? If so what are all the things that may have an affect on it?

Cheers

[PM-R33]

Yep definetely sounds like it is shorting. Are you sure there are no loose wires coming off of the ecu that could be touching, or loose wires in the engine bay?

[Lukas 33]

Ok that problem is all fix now I just disconnected everything under the bonnet one thing at a time till it stopped blowing fuses. It was the connector for the igniter. I just took it off and pluged it in again and it seemed fine. Weird issue. Im on the clutch problems now. But thats for another thread. Thanks guys