Jump to content
SAU Community

Recommended Posts

Hi peoples! I noticed while i was snooping around my engine bay that the the brown outlet on my aac valve doesn't have anything plugged into it.I have a forward facing plenum on my RB25 and the brown and purple outlets are not easily visible or easy to reach.I can't see a brown plug with wires attached that matches the brown outlet on the aac valve.I have however fond a dark blue on dangling around the same area. The purple plug on the aac valve is currently connected.Will it have any adverse effect on my engine if the brown plug remains as is?

Link to comment
https://www.sau.com.au/forums/topic/335628-aac-valve/
Share on other sites

you unplug it when setting the correct idle rpm, are you having idle issues?

Yeah the electronics do some sort of compensation, so you unplug, adjust idle, reconnect. I'm guessing without it connected you could expect the idle to be too drop low when the air con is on?? Or maybe when its cold?

Link to comment
https://www.sau.com.au/forums/topic/335628-aac-valve/#findComment-5432848
Share on other sites

It still idles at around 1000rpm when cold and idles between 750 &800 rpm when warm.still seems to idle around 750 with A/C on as well.Doesn't concern me too much,just wanted to make sure it wasn't damaging the engine or anything.

Link to comment
https://www.sau.com.au/forums/topic/335628-aac-valve/#findComment-5432894
Share on other sites

It still idles at around 1000rpm when cold and idles between 750 &800 rpm when warm.still seems to idle around 750 with A/C on as well.Doesn't concern me too much,just wanted to make sure it wasn't damaging the engine or anything.

nope it wont damage the engine

Link to comment
https://www.sau.com.au/forums/topic/335628-aac-valve/#findComment-5433940
Share on other sites

There should be a brown plug for the AAC (idle speed control). The purple plug is for the FICD solenoid. Basically it increases the idle when the AC is switched on. The dark blue plug is for the air regulator which operates independent of the ECU and is used to increase the idle when the engine is cold. The air regulator closes once the engine gets warm.

If the AAC is not connected there must be another means of idle control (presumably you have an aftermarket ECU).

Link to comment
https://www.sau.com.au/forums/topic/335628-aac-valve/#findComment-5438851
Share on other sites

There should be a brown plug for the AAC (idle speed control). The purple plug is for the FICD solenoid. Basically it increases the idle when the AC is switched on. The dark blue plug is for the air regulator which operates independent of the ECU and is used to increase the idle when the engine is cold. The air regulator closes once the engine gets warm.

If the AAC is not connected there must be another means of idle control (presumably you have an aftermarket ECU).

Yes, i have power fc. thanks for your info mate. So in other words if i put a stock ecu back in it would idle crappy?

Link to comment
https://www.sau.com.au/forums/topic/335628-aac-valve/#findComment-5441120
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • A few small updates since the previous post and lessons. I decided to do a little interior light upgrade on the 110. I quite like the iilumo items, even if they're a bit of a premium over other brands. You'll also note the Stedi Fogs, that will go into the S15 fog lights as I needed to match the bulbs since I got the new ones earlier. I hope they fit as the body is quite a bit longer than your normal bulb.  Annoyingly, I managed to trip the fuse, which normally wouldn't be an issue until I located the fuse. I can't say I've ever come across this. I had lucked out that someone nearby had a spare, but oddly enough Toyota dealerships seem to keep this in stock. I ordered some to keep in my stash and as luck would have it, someone else nearby tripped the same fuse so I passed on the favour.  I also did a little service on the 110 ahead of some additional work coming up. It's been annoying that Goleby's stopped carrying this particular HKS filter for the 110, so now I need to keep them on order from Japan. I also took the opportunity to install a bash plate and number plate riser. The plate riser is such a cheap but nice fix to help really tidy up the car. I'm tempted to now also replace my headlights, on this car. Both items were from Project Aero.    I also needed to replace the rear tyres on the 110, and after trying to get it aligned learnt that I need to replace some bushes in the front end, so that's next.  Closing out this update with a nicer picture as always! 
    • Yeah mate, never miss it.
    • Any going to watch World Time Attack at SMSP this year?
    • Appreciate the correction on the "ground", that will make a huge difference to looking at this. That makes complete sense about AF70/AF71 which is what I had come down to being the issue, one of these. I'll have another look in the ignition wiring when I get a chance next week. I'll also make up a jumper wire for running that AF73 test.  ECU is fine, relay itself is fine, pump harness is fine and the pump itself is fine. I am going to upgrade the Walbro 255 anyway with a DW300 I have since I need to replace the fuel sender and I'm going to upgrade the FPR with my chasebays kit ready for new plenum/injectors/dbw, but I'll get this working first. That's why this is so frustrating. 
×
×
  • Create New...