ECU wiring for novices
ECU wiring for novices
Say for instance I had a 1uzfe ECU from an LS400 and wanted to put said engine in my IS200, I assume I'd be able to use the LS400 ECU to get the engine running and provide information to the dash etc?
I'd expect to lose things like traction control etc. but would this be enough to look after the LS400 gearbox and everything else that would allow the car to run (until a standalone was installed).
If I had the wiring diagrams for both cars, is this going to be particularly hard work?
el_bandido
17-06-2019, 07:28 AM #1Right....
Say for instance I had a 1uzfe ECU from an LS400 and wanted to put said engine in my IS200, I assume I'd be able to use the LS400 ECU to get the engine running and provide information to the dash etc?
I'd expect to lose things like traction control etc. but would this be enough to look after the LS400 gearbox and everything else that would allow the car to run (until a standalone was installed).
If I had the wiring diagrams for both cars, is this going to be particularly hard work?
I reckon youll be staring at the wiring diagrams for a long time to figure it out.
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Sparkystav
17-06-2019, 07:45 AM #2Nope as the dash is hugely different. You'll need both ecus working side by side.
I reckon youll be staring at the wiring diagrams for a long time to figure it out.
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Edit: Not bothered about the RPM calculation being wrong for now, just need a working speedo and fuel gauge. Temp would be handy as well as the fans need to run.
el_bandido
17-06-2019, 07:49 AM #3Wouldn't I need to duplicate inputs to both ECU's to do that? Also, any idea where the speed sensor is on an LS400? The is200 one is on the back of the gearbox isn't it?
Edit: Not bothered about the RPM calculation being wrong for now, just need a working speedo and fuel gauge. Temp would be handy as well as the fans need to run.
Rpm comes from the ecu to the dash so that's easily done provided the ecu has an rpm output.
Temps a no as its sent to the dash via an mpx signal the LS ecu won't be able to send. Same with fuel level, and aircon)
You'll lose the immobiliser as well I reckon.
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Sparkystav
17-06-2019, 07:56 AM #4Speeds not a problem, as the ecu recieves the signal from the dash that receives it from the gearbox. As long as whatever gearbox you fit has a speed sensor your fine.
Rpm comes from the ecu to the dash so that's easily done provided the ecu has an rpm output.
Temps a no as its sent to the dash via an mpx signal the LS ecu won't be able to send. Same with fuel level, and aircon)
You'll lose the immobiliser as well I reckon.
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AC isn't such an issue for now, the link ecu should be able to deal with that eventually.
el_bandido
17-06-2019, 08:05 AM #5Could I run the fuel level via the is200 ecu? Would it also not be possible to keep the immobiliser alive with the IS200 ecu as well, provided it has power? Not sure how it's wired up to the ignition circuit in an IS.
AC isn't such an issue for now, the link ecu should be able to deal with that eventually.
The immobiliser is built into the ecu. So running the engine from the LS one will render it useless.
And you'll need some clever wiring again to keep the fuel gauge working when the LS ecu is running the engine.
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Sparkystav
17-06-2019, 11:31 AM #6The link ecu can't really deal with the aircon without a bit of complex wiring.
The immobiliser is built into the ecu. So running the engine from the LS one will render it useless.
And you'll need some clever wiring again to keep the fuel gauge working when the LS ecu is running the engine.
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When you move to complete standalone you'll have to lose these items anyway.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
Sparkystav
17-06-2019, 11:46 AM #7I'm not saying it can't be done, after all they worked on my car but i had standalone and IS ecu not LS and IS. But it's simpler to remove the offending items, dash, immobiliser etc and replace with aftermarket items.
When you move to complete standalone you'll have to lose these items anyway.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
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edit: I reeeeeeeally don't want to lose the IS200 dash, it's my favourite part of the car haha. Might replace it for an IS350 dash though, as I'll need gear indicators.
el_bandido
17-06-2019, 12:41 PM #8I take it your aircon isn't working then? I don't want to have to go syvecs because I could go and buy an IS300 for the price of that ECU.
edit: I reeeeeeeally don't want to lose the IS200 dash, it's my favourite part of the car haha. Might replace it for an IS350 dash though, as I'll need gear indicators.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
Sparkystav
17-06-2019, 12:54 PM #9The aircon did work with the old setup. However I've removed it now, the pump had to go to fit the alternator because of the new manifold and the pipework looked ugly so that had to go, and losing the rd saved weight. All in all a good thing lol. And ive the sunroof and windows for hot days.
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
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Ok mate, thanks for the answers thus far, I'll investigate further regarding the LS400 ecu and I will be back to pick your brains about running both ecu's at once.
el_bandido
17-06-2019, 01:12 PM #10I still want to keep mine fairly luxury, so the aircon has to stay
Ok mate, thanks for the answers thus far, I'll investigate further regarding the LS400 ecu and I will be back to pick your brains about running both ecu's at once.
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