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+--- Thread: My little project - IS200 Turbo (/showthread.php?tid=1216)
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My little project - IS200 Turbo - steviewevie - 19-01-2020
Next thing to be addressed was the aircon. Ed altered the wiring slightly so that the aircon could switch on when the button was pressed. The aircon pump will stay on all the time the switch is pressed now, though I only tend to use the aircon when I need to, I don't leave it on all the time, so that shouldn't be a problem. He did recommend that we sort out a thermostat to wire in there so that t wouldn't freeze up if left on for a long period, and I got a kit from Maplin for that (link) , which I still need to make and get installed.
![[Image: rr51.jpg]](http://images.maplin.co.uk/300/rr51.jpg)
The aircon light is now always lit dimly, even when not switched on, but it is brighter when the button is pressed. I could be wrong, but I think this is because it's the light itself that has been used as the source to detect whether the pump needs switching on or not.
The fuel enrichment was altered in the engine startup, and that seemed it cure the misfire (it had been putting too much fuel in).
My little project - IS200 Turbo - steviewevie - 19-01-2020
Since the main work was complete, I collected the car, what a happy day ! Ed had another go at getting the correct signals from the front speed sensors, but it seemed that the only ways in which the ECU read the right signal then caused the ABS warning light to turn on, which is clearly not a good thing (this was tapping into the same wiring feeding the ABS ECU, obviously).
After a few motorway drives in the car (which were great !), I found I started to get an Error 8 code on my AFR gauge, which indicated a sensor (wideband lambda) timing error, typically caused by overheating. The error would occur after driving for a while at motorway speeds. I wondered if there was something about the map which meant that the exhaust gases were now hotter ?
Looking at the LC-1 manual, and around the Internet, it looked like this was not an uncommon problem. Suggestions included moving the sensor further downstream, or making a heatsink for the sensor (Innovate even include in the manual a template and instructions for making a simple sensor out of a bit of copper sheet). Another alternative was a special mounting to move the sensor further out of the gas flow, but this was quite expensive.
I decided to buy a small piece of copper from eBay, and asked Ed to make up the heatsink for me (just bending it in a couple of places). I also got him to tweak the fuel cut-off point in the maps, since it was a bit high before and the car wasn't cutting the fuel when I lifted off, which was a bit disconcerting (like I was still on the throttle).
My little project - IS200 Turbo - Sparkystav - 19-01-2020
The aircon thing sounds like how I've got mine setup.
I think we used the water injection program of the link to have it turning on and off every few seconds in order to stop the freezing up. Don't know if that helps?
My little project - IS200 Turbo - el_bandido - 19-01-2020
would it not have been easier to just leave the is200 ecu in to run things like the AC, alarm and whatnot?
My little project - IS200 Turbo - Stoney - 19-01-2020
el_bandido would it not have been easier to just leave the is200 ecu in to run things like the AC, alarm and whatnot?
Would have been EASIER to leave the whole car stock. :-D
Sent from my GT-I9100 using Tapatalk
My little project - IS200 Turbo - el_bandido - 19-01-2020
Stoney Would have been EASIER to leave the whole car stock. :-D
Sent from my GT-I9100 using Tapatalk
I can understand using the syvecs for engine management, as it gets a lot more power etc, my point is, you don't gain anything by spending ages ironing out headaches that the is200 ecu could have happily done in the background.
My little project - IS200 Turbo - Sparkystav - 19-01-2020
But the problem is the Lexus is so complex.
The aircon won't run without certain signals from the engine (rev etc).
The dash won't run without lots of signals from the engine.
But you can't just feed these signals to the dash from the syvecs as its all sent via a multiplex signal.
So that's why you have to find workarounds like this, everything's interconnected and it simply won't work without the engine ecu running the engine.
My little project - IS200 Turbo - el_bandido - 19-01-2020
that's the answer I was looking for. How much of the standard ecu can you actually leave running? You must be able to use some of the programmable outputs to talk to the old ecu for some things?
My little project - IS200 Turbo - FirebirdPhil - 19-01-2020
Well that's the ONLY thing TGT got right with my set up - stand alone ECU and immobiliser worked fine, AC worked fine (when gassed), all gauges worked fine. Leaving the OEM ECU in and having a stand alone is possible. They stigged everything else up so a waste of some clever wiring.
My little project - IS200 Turbo - Sparkystav - 19-01-2020
Don't get me wrong the link on mine worked spot on with the standard ecu still fitted to run the gauges etc.
But now I've changed speedo, got another alarm, and (although im not putting it back) I'd figured how to run the aircon I have no need for it. So that's why the ecus gone to smooth the engine bay out.