LS400FAN

Thanks Yamae, you're a big help.

GeorgeNVA

Some info regarding 1uz-fe vvti engines:
LS400 ECU is interchangeable with SC400 ECU (if both are for vvti engine)
LS400 ECU is also interchangeable wit JDM ECU for UCF20/UCF21 Toyota Celsior, keeping in mind three things:
-immobilizer (can be bypassed)
-180km/h speed limit in JDM ECUs (can be bypassed)
-56 and 57 DTCs in JDM ECU, they stand for integrated hydro fan control that's unique for Japanese models. However, unlike in 1992 model, the 56DTC does not affect driveability

Here's the ECUs I tested with my '2000 1uz-fe engine (UCF21 Celsior)
JDM:
89661-50450
89661-50520
89661-50521
89661-50522
European:
89661-50440
USDM, Soarer
89661-24530

Also, there's extremely rare ECU with part number 89661-3A300. It's for 150 series Toyota Crown, 1uz-fe vvti, and it does not have security system. It's compatible with all ECUs listed above. Note that 170 series Crown has immobilizer system and is NOT plug and play compatible to these ECUs.

Troupe

Greetings all. Down here in New Zealand we have quite a few Windom 3.0Gs. I have a 1993 which I am trying to restore. The ECM is a Denso FF 89540-33020 which even my local expert ECM repairer doesn't have a pinout for. I wonder if Yamae can dig one up in Japan - these cars are made for that market and imported second hand into NZ.
Appreciate any help and thanks for letting me join your club.

Yamae

The Denso FF 89540-33020 is not an ECU. It's an ABS controller. You can find it some at the Yahoo Auction Japan so called YahoAuc. There is one below today. You can ask the agent to bid.
The page of the agent.
http://yahoo.aleado.com/lot?auctionID=v422812113

The original page.
http://page17.auctions.yahoo.co.jp/j...ion/v422812113

Troupe

Many thanks Yamae. Yes, I had just discovered that I was looking in the wrong box!! I'm holding the Engine Controller (89661-33200) in my hand right now. Needless to say, I am very new to this sort of thing.
If I may impose on your good nature, my problem is a transmission fault which the computer tells me is #1 and #2 shift solenoids. I have tested them and know they're OK. I wanted a pinout so I could check the loom (which I also think is OK) before digging deeper. Is it likely the fault is in the Engine controller? After some more research I am beginning to think it might be the ECT.
Appreciate your help.

Yamae

Sorry that I'm not familiar to your car and I don't have enough information. This is a LS400 forum and other people also don't know it well neither.

The only thing I can say is that Toyota usually includes the AT controller in the engine controller. Your problem may be related to the ECU capacitors but without seeing yours it's hard to tell. Why don't you see inside and check that it has Nichicon capacitors printed PF(M) or PR(M).

Troupe

Many thanks. I think I'm on the right track now. I've found the ECM (behind the glovebox, not by the passenger pillar where I had originally been told). Will have a look inside today.
Apologies for my blunder. I will search the ES300 threads today.

djru5h

Hello.. I am new here and I recently purchased a 1995 LS400. It smokes (white) from time to time and runs pretty rough while its doing that.. Other times it runs like new.. After reading several posts in this and other forums I am convinced that it is my ECU and not my engine.. My question is: when swapping an ecu can any of the part #'s (for my year/model) listed above be used to replace my current ecu or does the part number have to match?

Yamae

You'd better not be convinced without seeing the actual figures printed.
A 95 LS400 was needed to update the firmware for some customers. Search more and you will be finding about this.

djru5h

If the figures that you speak of are diagnostic scan codes my LS does not send any codes back (even with the CEL on). I have managed to get to the ECU.. my part # is 89661-50224.. i found a matching replacement w/key online and I have read numerous threads/posts on this forum regarding the issue. the seller of the replacement ecu says that the security system would need to be programmed to the ecu.. is this something that only the dealer can do or is it possible for me to maybe go to an import shop or locksmith? Please excuse my noobish questions. I have owned many vehicles but I have never had an ecu fail so I don't know what exactly to expect.

Yamae

You'd better not trust the seller. A 95 does not have a immobilizer system and there's no way to program the ECU.

djru5h

sigh.. that is very frustrating to hear.. I've been having a difficult time locating the ECU that I need and when I finally do it's "suspect"..

here is the one I found:
http://www.ebay.com/itm/231932462801?item=231932462801&viewitem=&vxp=mtrI'm just confused as to why the security feature would need programming if the 95 LS400 ECU does not get programmed... just so i'm clear on this, if i were to get the exact model ecu that I currently have should it be plug and play?? The reason I ask is because the one i found on ebay comes with a key.. I assume that key is preprogrammed to that ECU.

Yamae

Keys for a 97 LS400 and after are preprogrammed. Seems both you and the seller don't know the fact.

djru5h

ok. i see. thanks for the info... and as far as me not knowing the facts, that's why I am here asking questions... thanks for pointing that out as well..

oldskewel

iTrader: (1)

Here's what may be leading to confusion on the earlier cars ... I'll just talk about my '91, since I don't know for sure about the others.

There is no immobilizer system (as modern cars have). But the keys (slightly fatter hey head with one button) are programmed to communicate with the central locking system. The "box" for that is in the trunk, on the left side, I think. But we're talking about the _central locking system_, not the ignition immobilizer.

Close enough to potentially cause confusion, when different languages are involved and when the systems changed in later models.

===================
BUT .... I have a feeling you're drifting off track here a little. I would not jump to the conclusion that you need a new ECU. The white smoke is classic power steering idle-up air valve. Get that taken care of first. Read up on this list about the extra work required to keep these early power steering systems running well. The single one thing is to find and clean the rack solenoid filter.

Do all that, then see how it runs. And if you do ever dive into the ECU, make sure you don't make things any worse than when you started. These cars generally are great, and run well for a very long time.

Good luck.