FYI: 5VZ-FE V6 works fine with the auto A340H
10-31-2007, 09:39 AM
#61
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cant swap sensors for several reasons the main one being they are accuated differntly.
and yes a T100 5vzfe ECU would work perfectly with a A340H trans. But again RARE and EXPENSIVE plus then you have to have a T100 Engine harness as well once again rare and expensive when compared to the more common 4runner or tacoma ecu's and harness's, Let alone engines.
and yes a T100 5vzfe ECU would work perfectly with a A340H trans. But again RARE and EXPENSIVE plus then you have to have a T100 Engine harness as well once again rare and expensive when compared to the more common 4runner or tacoma ecu's and harness's, Let alone engines.
10-31-2007, 08:11 PM
#62
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11-01-2007, 04:46 AM
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I took apart the ECU from my truck (easy to do). And then did some research. There are two cpus mounted, the main one and one that specifically controls the automatic transmission.
These CPU's (I think Hitachi) have a write once rom embedded in them, there-in lie's the specific code for the engine, tranny etc..
I also got a look at a 4x4 manual ECU, the manual model is missing the tranny cpu...
Otherwise they are identical.
So, what I am looking for are some high res pics of the early T100 4x4, auto ECU, and the same pics of the 5vzfe taco ECU. (the inside and external pinouts).
I could be wrong, but I have a lot of experience with embedded roms like this.
I think I can remove the CPU, copy it, and then rewrite it to new cpu/rom. Then install it in another ECU.
This is going about it all backwards, but in the end it may be the easiest thing to do.
These CPU's (I think Hitachi) have a write once rom embedded in them, there-in lie's the specific code for the engine, tranny etc..
I also got a look at a 4x4 manual ECU, the manual model is missing the tranny cpu...
Otherwise they are identical.
So, what I am looking for are some high res pics of the early T100 4x4, auto ECU, and the same pics of the 5vzfe taco ECU. (the inside and external pinouts).
I could be wrong, but I have a lot of experience with embedded roms like this.
I think I can remove the CPU, copy it, and then rewrite it to new cpu/rom. Then install it in another ECU.
This is going about it all backwards, but in the end it may be the easiest thing to do.
11-09-2007, 11:24 AM
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11-09-2007, 07:00 PM
#68
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Sorry i just finished my 1200+ mile trek back to Wa, ill see what i can do about getting you a pic next week. i cant help on the t100 but i can get you a 3vze ecu pic. i got a guy here im going to go see next week that might beable to help make a converter.
11-09-2007, 07:06 PM
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I already have a 3vz ECU. Some pics of and auto/4x4 5vz would be most helpful though.
I have a suspicion, that there is a good chance I could put together a hybrid
ECU that would totally eliminate having to buy a wiring harness adapter.
Pure speculation right now, but I think it might be possible.
Chuck
Last edited by LoneStarMac; 11-09-2007 at 07:10 PM.
11-09-2007, 07:58 PM
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Here are pics from my 90 4runner's ECU.
The embedded roms/processors are located on a daughter card.
It first I thought they were Motorola, but now I'm pretty sure they are both Hitachi.
The topmost chip is for the tranny and the bottom is the main processor.
If I could get some of the same pics of the 5vze, and even another year 3vze might help also (if it's different)
The embedded roms/processors are located on a daughter card.
It first I thought they were Motorola, but now I'm pretty sure they are both Hitachi.
The topmost chip is for the tranny and the bottom is the main processor.
If I could get some of the same pics of the 5vze, and even another year 3vze might help also (if it's different)
Last edited by LoneStarMac; 11-09-2007 at 11:49 PM.
11-12-2007, 09:18 PM
#73
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eliminating the wiring harness adapter/conversion harness would be impossible because it is what makes it possible to connect the 3.4 ecu and engine to the body harness. there is no conversion harness between the ecu and engine.
11-19-2007, 09:20 PM
#74
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okay so talked with some more knowledgable people then myself today about the speed sensor issue and got some good news and bad news. it doesnt look like it will be possible to create a box to plug into the No. 1 VSS and convert its signal to use as the No. 2 VSS. this is because The No. 2 VSS IS like thefatkid was saying a 2.5 volt A/C analog signal where as the No. 1 VSS is a DC Digital Signal.
The good news is that we should beable to mount the sensor in another location with a proper ring and still get signal unfortunately we may still throw codes when in 4low because of the lack of percieved differnce in the rotation from the output shaft of the trans to the output shaft of the T/CASE
here is some pics of the reluctor ring in a A340F tacoma or 4runner
This picture has the reluctor ring from the A340F thats the thing with 4 prongs on it. the other one that has 2 lobs is the single magnet actuator for the older a340h reed style vss.
This picture shows the same sensors and rings
The good news is that we should beable to mount the sensor in another location with a proper ring and still get signal unfortunately we may still throw codes when in 4low because of the lack of percieved differnce in the rotation from the output shaft of the trans to the output shaft of the T/CASE
here is some pics of the reluctor ring in a A340F tacoma or 4runner
This picture has the reluctor ring from the A340F thats the thing with 4 prongs on it. the other one that has 2 lobs is the single magnet actuator for the older a340h reed style vss.
This picture shows the same sensors and rings
Last edited by thefallman; 11-19-2007 at 09:44 PM.
12-14-2007, 03:35 PM
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I though I'd give a little update.
I decided that it would be easier to switch to a T100 ECU. I have a 98 Taco harness and through some research it shares the same connectors as the 96-98 T100 ECU. Basically it is a direct plug-in to my harness with one wire removal (ECT power wire) and one removed and spliced to a ground (speed sensor is now grounded not returning to the ECU). The shifting occurs like it is supposed to and shifts at 5200rpm rather then sitting on the rev-limiter for 3 seconds then shifting at wide open. Also it doesn't down shift too far running into the rev limiter.
I was able to find my ECU off of Ebay for $270 shipped.
I had no luck mounting the sensor off of the driveshaft. The airgap needed to be too close and the bolts are not that true (too far clearance on one contact on the next). Also the bolt spacing was not even creating a uneven signal. I tired to line up the bolts as best i could but I still got a code and put into limp mode.
I decided that it would be easier to switch to a T100 ECU. I have a 98 Taco harness and through some research it shares the same connectors as the 96-98 T100 ECU. Basically it is a direct plug-in to my harness with one wire removal (ECT power wire) and one removed and spliced to a ground (speed sensor is now grounded not returning to the ECU). The shifting occurs like it is supposed to and shifts at 5200rpm rather then sitting on the rev-limiter for 3 seconds then shifting at wide open. Also it doesn't down shift too far running into the rev limiter.
I was able to find my ECU off of Ebay for $270 shipped.
I had no luck mounting the sensor off of the driveshaft. The airgap needed to be too close and the bolts are not that true (too far clearance on one contact on the next). Also the bolt spacing was not even creating a uneven signal. I tired to line up the bolts as best i could but I still got a code and put into limp mode.
02-20-2008, 06:02 PM
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Recap
Sorry for the "newb" comments but i am trying to recap on this discussion to make sure i understand everything.... Ok, first off im glad to hear the 3.4 will bolt right up with the 340H tranny and engine mounts from a 3vze..right? Second the speed sensior is showing to be a problem. This is the only problem that is occuring with the swap?? just the speed sensior, and this is causing the crazy shifting?? So far the only real solution has been find a T-100 ECU. Im also glad to here that a Taco wiring harness fits/works with the t-100 ECU. On that last post I was curious about the ECT power wire removal. Did that render the button useless in the truck?
02-21-2008, 12:16 PM
#78
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Let's not forget the bigger picture, the A340F tranny works great with the 5VZFE, so that's a solution also. They were after all, designed by Toyota to work together in the Tacomas and 4runners.
Last edited by mt_goat; 02-21-2008 at 12:17 PM.
02-21-2008, 02:10 PM
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good point. i think i'd lost sight of that. but i for one am all for finding a solution. i'm sure there's others like me that would love to be able to take out the trash and put in the new in a day or two.
02-22-2008, 07:56 AM
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The A340F Definitally would be the better solution overall. Especially since it can handle more horses if a supercharger was ever wanted down the road. But right now ive got a bad 3VZE and I dont feel like forkin out the money to fix it. Id rather upgrade to something more reliable! Im on a pretty low budget so using all the parts i already have would greatly reduce the cost... Also car-parts.com has a bunch of those T-100 ECU's.
