Rb25 Neo Ecu Wont Ground Ignition Relay

[godzilla_753]

Hi,

I wasnt sure where to post this, but I figured I would give it a go in this subforum. If there is a better place to put it, mods please do so.

I have a stagea r34 NEO rb25 that ive been working on for the past few months. Having done most of the wiring myself I got the car to start and idle but there seems to be one or two small things left.

On my ecu loom, the plastic clip is missing a wire on pin 31, which on most wiring pinouts has it labeled as having something to do with the ignition relay. If I ground the brown ignition relay myself the car will start but Nissan designed the relay to switch to ground through the ecu. This must mean that the ecu is not getting a signal from some input causing it to not ground the relay.

Here is a pinout for the ecu:

https://docs.google.com/leaf?id=0B9Awbp ... ist&num=50

Does anyone know what input im missing?

Why does my loom not have this pin?

I asked around a few months ago and it seemed someone else also had a computer with no wire on pin 31 making me believe I might be using the wrong pinout. Everyone always says the R34 GTT and Stagea wiring diagrams are the same so I am very confused on what to do now. I was told that if i supply my own ground as I have been doing, there is a chance I would burn up the ECU. Another option I have is to put my own pin in there and give it 12V. Im pretty scared to do that though, because I bought this as a whole front clip, and it obviously ran before so I dont want to start experimenting. I obviously would like to get the issue fixed since it seems like a small one, so any help would greatly be appreciate.

thanks!

[BH_SLO32]

The brown relay should be earthed through pin 4 by the ECU. Pin 31 is an "ignition" power supply (ie. power feed when key is turned to the IGN position). I have a loom from a stagea with an R34 Neo and it has a wire in pin 31. That said, Nissan released a number of different looms for the Stagea engines and you may have got one without a feed to pin 31.

Hi,

I wasnt sure where to post this, but I figured I would give it a go in this subforum. If there is a better place to put it, mods please do so.

I have a stagea r34 NEO rb25 that ive been working on for the past few months. Having done most of the wiring myself I got the car to start and idle but there seems to be one or two small things left.

On my ecu loom, the plastic clip is missing a wire on pin 31, which on most wiring pinouts has it labeled as having something to do with the ignition relay. If I ground the brown ignition relay myself the car will start but Nissan designed the relay to switch to ground through the ecu. This must mean that the ecu is not getting a signal from some input causing it to not ground the relay.

Here is a pinout for the ecu:

https://docs.google.com/leaf?id=0B9Awbp ... ist&num=50

Does anyone know what input im missing?

Why does my loom not have this pin?

I asked around a few months ago and it seemed someone else also had a computer with no wire on pin 31 making me believe I might be using the wrong pinout. Everyone always says the R34 GTT and Stagea wiring diagrams are the same so I am very confused on what to do now. I was told that if i supply my own ground as I have been doing, there is a chance I would burn up the ECU. Another option I have is to put my own pin in there and give it 12V. Im pretty scared to do that though, because I bought this as a whole front clip, and it obviously ran before so I dont want to start experimenting. I obviously would like to get the issue fixed since it seems like a small one, so any help would greatly be appreciate.

thanks!

Edited November 26, 2010 by BH_SLO32

[blk94r33]

So you're saying your car won't run as the ignition relay is activated via earth switching form the ECU? If your unable to find an ignition switched earth, rig up a relay, that runs from a 12v switched supply from the ECU (ie. fuel pump), and hook your ignition to earth via this? If that makes sense?