R33 Engine Control Fuse Keeps The Car Running If In

[mattnama]

I have checked through the forums but cannot find the info I need.

I have a 93 r33 gts-t with a series 2 rb25det in it, I was going over fuses today and found 1 missing under the dash, it's the left column engine control fuse, I have had no issues with the car except my driver headlight not working, anyways I put a new fuse in its place and when I switched off the car and removed the keys it kept running, as far as I know it has no turbo timer, unless it's really well hidden, but I left the car running and it didn't turn off, so I stalled it and removed the fuse then tried again and it was back to normal, no idea why, might it have something to do with the engine swap or deeper issue? Btw I bought the car after the swap, it was a det to begin with

[Dr. Surge]

Maybe they've made little mistake in swapping the engine from a s1 to s2. The way you tell ut, it seems that the ecu is still getting 12v with ignition off and the fuse placed. Normally, if you switch off the egnistion, the ecu doesn't get 12v anymore and the engine shuts down

[mattnama]

That's what I was thinking, that they may have put what's needed into the 1 right column engine control fuse, but I just can't work out why it keeps the engine running if that's the case

[Duncan]

definitely a wiring mistake of some sort, but I wouldn't worry about it if it works correctly without the fuse in. Pretty much everything in the ECU runs through the ECCS relay which is controlled by the ECU. So if for example they have wired battery 12v through that fuse to the ECU instead of from the ignition key it would never know you turned the key off, and never stop running

[mattnama]

Thanks guys just needed to know

[89CAL]

Bit of a thread dig but I came across this yesterday when I was trying to find something draining the battery. Ended up with a lot of fuses out at once and figured no harm in replacing them as per the fuse diagram. Long story short, car wouldn't turn off. Messed around and found as above, if I pull 1 of the 2 engine control fuses out then the problem goes away and car goes back to normal.

However, looking at the wiring diagram, it seems like a pretty important power supply to get rid of (And I could have sworn it was in before, but could be wrong) so basically just after a definitive answer - Is it O.K to leave this fuse out? What is the point of it if so? FYI: I found the switch for the boot light was not working so disconnected it and re-wired the two grounds for my alarm (1 of them back to where it was and the other to the steering column mount) so don't believe either of these things are related.

Diagram (Have put the fuse in where it lives in the circuit, is straight feed from the battery prior to this point):

As far as I can see the relay must be getting its power From the ECU now. Perhaps the ECU is not switching the ground for the power feed through the fuse correctly and therefore it was constantly on when installed?

It is a Link G4 ECU in this car by the way.

Maybe someone else with an R33 GTS-t (Mine is a series 1) could see if this fuse is missing from their car? (6th from the bottom on the left side of the fuse panel drivers side)

[89CAL]

Noone? Interested to see if other R33's don't have this fuse. Thinking about wiring a relay in so that it will work when ignition power is on. Seems like its pretty important. According to the diagram it looks like the main feed in