hihopes

iTrader: (7)

So I swapped a w58 into my automatic 1997 sc300 back in may from another running sc300. I have been running the auto ecu since then with no problems besides 3 check engine lights. They were p0753, p0773 and p1780 for the 2 solenoids and pnp switch malfunction. Car still ran fine with no problems despite the codes.

I came upon a 1997 5 speed ecu, so I grabbed it thinking I wouldnt have to deal with any codes being thrown. I just tried to plug it in and the car didnt run too well. As soon as I started the car, it was struggling to stay alive. My CEL came on and trac off light started blinking I thought maybe it'd get better while the car warmed up, but it didnt. Im assuming it was running super rich since i smelled a strong gas smell. While parked sitting in neutral, if i give it gas, the rpms are kinda jumpy. If i give it only a little gas, the car stalls out.

I didnt even try to drive it anywhere since something seemed wrong. I put the auto ecu back in so I could drive and it was back to normal.

Anybody know why this is happening?

Vrank

iTrader: (4)

List the part number for the 5spd ecu you have, the one starting with 89661 iirc. I have 97 ewd, ill see if I can compare differences. Same thing happened when I tried an obd2 auto ecu in a factory 97 5spd to try to rule out some issues like last week. Reason I bought the ewd.

hihopes

iTrader: (7)

The part number is 89661 24470

hihopes

iTrader: (7)

I was advised to open the ecu and check the caps. So i checked it out and there was a leaky capacitor in the ecu. Im hoping that was the problem.

Bflatsharp

iTrader: (18)

my 92 sc300 ecu was bad rich fuel, bad idle no codes or lights. had it rebuilt, 40,000 miles later no trouble.
tv repair guy or elec. repair guy will do it for a good price if you cant .. your board looks good from here.
good luck

hihopes

iTrader: (7)

Yeah i already ordered the replacement cap and will attempt the job myself

hihopes

iTrader: (7)

So I replaced the cap the other day.

Plugged the ecu in again and at first the car started and stalled right out. I started it again and it stayed on but was idling very low and had the same problems as last time.

I checked the cel and p0100 came up. A couple of things that cause p0100 are problems with the maf and a failed ecm. Now im assuming that its not the maf since i have no problems or cel for that when the auto ecu is plugged in.

Does this just mean the ecu isnt compatible with an originally auto car?

hihopes

iTrader: (7)

I did some searching and came across this thread here

https://www.clublexus.com/forums/per...g-wrong-2.html

I see that it is possible to use a 96 manual ecu with an originally auto 97, so im assuming there has to be a way to get the 97 manual ecu to work on my car.

Is there any chance that the 97 auto and 5 speed ecu's would have different pins? Can someone check the pins for me or take a picture of the pinout of both?
Please & Thanks!

lfrers

iTrader: (9)

https://www.clublexus.com/forums/sc4...ml#post8282881

Some ECUs if you need one, one auto and the GForce is manual

pins should be the same

Ali SC3

iTrader: (10)

its showing up online as a 95-96 ecu.
http://www.lexuspartsnow.com/parts/l...661-24470.html

If it is a 96 and odb2 there may be a way to make it work. I think 96 and 97 may have different ground pins for the maf, I want to say the 97 uses pin 28 and the 96 uses pin 30 (EVG) and is the only ecu I know of that uses pin 30 for the ecu ground wire. We were talking about his recently in the tt ecu mod thread for 96 and 97 owners and all my diagrams from a gte and a 97 GE say hotwire maf ground is pin 28, but some 96 owners are saying EVG pin 30. I think toyota got a little goofy that year.

so maybe moving the ecu ground wire from pin 28 to pin 30 will let you use the 96 ecu and have it run.
If you get any other codes like for the secondary crank sensor it may also be on a sperate pin, but that is only for detecting misfires and will trip a code, the ecu will run fine without it connected it will just display the code.
It is all outlined in that thread actually, good luck!!

hihopes

iTrader: (7)

Thank you ali sc3. I didnt even think to check the year, but youre right, its coming up as a 96 ecu.

I already read up about the pin changing for the 96 ecu to work with 97s in the thread i linked, but let me just make sure im understanding correctly. So im just switching pin 28 and 30? They both get put into each others spot, or is 28 only getting moved to 30?

Thanks a ton for the help

Ali SC3

iTrader: (10)

I am making an educated guess here having never seen a 96 or 97 harness, but I would think you have a pin in 28 and no pin in 30, so it would just be moving one to the other. If you have a pin in 30 then that would be odd and let us know if that is the case, I doubt you would want to swap them. if there is a ground on 30 then you would probably splice the 2 together, but I really think 30 will be empty, and you just move pin 28 over to 30.

hihopes

iTrader: (7)

Alright thanks for clarifying that for me. I will check it out next chance i get and hope for the best haha

Ali SC3

iTrader: (10)

Np, let us know how it goes its one of those things I was wondering about myself between 96 and 97 diagrams.