the big CPU question

[peleus21]

i have a 2002 standard gt-s. now from what i have been told, 2k2's have the fuel cut off at 7800 rpm by the way is correct, and the 2000 and 2001 it is 8200 or something. this would be programing inthe CPU right? now for my question. will a 2001 CPU work for a 2k2 and vice versa?

got a friend with a 2k1 auto who might sell his car and if the CPU's will swap we are gonna do a swap so i have the higher rev limiter

any help would be great

[00 scrub]

someone did this before(I think it was Auto[Bot] GTS) with both a 2k and 2k1 ECU and it did not change the fuel cutoff. Actually I think he was having some rough engine problems. Someone also mentioned that the 2002 2ZZ-GE has a second knock sensor, so that could be why the ECUs are incompatible.

[peleus21]

so they are incompatible? damn so much for that idea then... :ugh: :wtc:

i will find some solution somehow... got to be one

[BlackGTS2002]

I wont sleep till i get rid of that damn rev limiter!!!

[Auto[BoT]_GTS]

naw it wasnt me but someone i think it was ezrida.....but it doesnt work.......i was about to go out and by one to....

[gto78]

my 01 gt-s auto cuts off at 7800 also. i just want a couple hundred more is all.........

[soceur]

i was told by a TTE tech that this swap might work, but you would have to flash the rom once it was in. Its not plug and go (play)

[peleus21]

i just want a couple also just to 82 but 8500 would be the best

[t2000gts]

don't swap auto and manual ECUs...or try it and see if the auto tranny even works with the manual ECU...

how do you go about flashing the rom once it's in?

[peleus21]

ya i would like to know that too not like you can just plug that baby into our home computers

[Griffin]

The production change to the 7800 RPM cutoff Took place in April or May of 2001 from what I hear - that means that you could check teh production sticker on the door and scope production date and you'll know. A late 2001 could probably be swapped to an early 2001 ECM - now a 2002 on the other hand cannot be swapped not because it has *2* knock sensors - it only has one - but it is a new STYLE of knock sensor. It's the new flat type sensor Toyota developed that has a much greater range and sensitivity... the only problem is it uses a 2 wire connector and different ECU logic than the old style of knock sensor. You could conceivably put a 2000 or early 2001 ECM in and swap out the knock sensor - but you would have to wire up a connector... and knock sensors cant take standard wire and butt connectors - its a very sensitive signal - you would have to use an unbroken shielded wire with grounded shielding like is used stock.... (You can get microphone co-ax from radioshak and use that but you have to be sure to properly ground the shielding or RFI will screw up the signal) it may be possible to pop the terminals out of the current connector and into the old style... but I'm not 100% sure if the pin size is the same. So anyways I think it could be done it would just take a little work.

Griffin

[analogvoid]

How much of a performance loss is there on the 2002 GT-S vs. a 2000 GT-S for instance ?

[EzRidA]

It was me that switched the 02' GT-S ECU with a 01' ECU. I'm still working on solutions.

What's this about flashing the rom?

[peleus21]

performance wise i think the only diff is the rev limiter being lower making it way harder to stay in lift. just look at the 1/4 mile times they post vs. 2000 they are like 15's or something


Ez - so what exactly happened when you did it? and i think Griffin is probably right about sensors, but what is your take?

[EzRidA]

My take is that Yota is a bunch of asses. :gap: Seriously though we switched the ECU and disconnected the battery for 5mins. Put everything back together and started the car. Everything looked good and we started getting giddy with excitement. So I pull out at the first available stretch of road I floor it and I hit 6k.............and bam CEL no lift car starts stuttering wouldn't go past 7k. It was like it was in safe mode.

[autxr]

OK, if the car starts and runs, then gives a CEL, then read the damn code. You want to know what is wrong, the car is telling you what is wrong.

If it is a knock sensor, then grab the sensor and part of the wiring harness from a donor car (Matrix, Vibe or Celica).

Scott

[EzRidA]

Not a bad idea, but one we didn't have anyway to scan the code at that time and two Toyota was closed because we did this at night. Now that I think about it I may just go and try this. It never occured to me. Thanks.

[Griffin]

You can short 2 pins in the DLC3 OBD 2 check connector and it will flash the codes on the dash using the CEL - you need a manual to tell ya what pins though.

Yes I am right about the knock sensors changing in 2002. - Ran into it the other way around when a guy tried to put a complete engine from an 02 into his 01 and had to change out the knock sensor for the one off his old block. The new 2 wire sensor is much more sensitive - it can detect knock much more accurately and as such the ECM logic has been changed to compensate - the old logic will not recognize the input from the new sensor - that is why you will have to get one of the old sensors and install it and wire it up per the 00 or 01 wiring diagram.

Sorry this is so abrupt, but I'm feeling grouchy - got a cold ;(

Griffin

[peleus21]

well that would get us 2k2 guys back to 8300 or whatever it is at least. best news i have heard on CPU info in this forum

[Griffin]

Probably so :) - just be sure when you rewire to use a shielded wire that has teh shielding properly grounded. Can't emphasize this enough!

Griffin

[Jesse IL]

As crazy as this may sound, I believe you would need the corresponding gauge clucter for the ECU to work. A while back, people with later 2000 and 2001 models wanted early-2000 ECU's. This is because early models had the cam switchover at 6000 rpm while newer cars will switch at 6200 rpm. Look at dyno charts if you don't believe me. What was found was that switching in a different ECU would either make no difference or cause the car to not run. It was theorized (but never proven) that there is something in the gauges that works with the ECU.

[Griffin]

Originally posted by Jesse IL
As crazy as this may sound, I believe you would need the corresponding gauge clucter for the ECU to work. A while back, people with later 2000 and 2001 models wanted early-2000 ECU's. This is because early models had the cam switchover at 6000 rpm while newer cars will switch at 6200 rpm. Look at dyno charts if you don't believe me. What was found was that switching in a different ECU would either make no difference or cause the car to not run. It was theorized (but never proven) that there is something in the gauges that works with the ECU.

ECU gets its vehicle speed signal from the combination meter - that could have something to so with it. I'd have to go over the wiring diagrams to be sure about any other changes.

Griffin

[EzRidA]

If you guys get me the part number's and diagrams of what is needed to do, I will go ahead and try this out. I can take my car to my dad's shop and start once I get the parts. Knock sensor I'll get from the junk yard because the dealer is definitely going to ask for at $115 for that kind of sensor if not more. ECU I'll use my friends to see if it works. If it does I'll get the ECU from the junk yard. Same thing goes for the cluster. Also I'll make and easy bypass for the knock sensor so I can swap the old sensor in in case this doesnt work.

As for the ECU harness what pins need to be changed? This seems to be the most complicated part.

-Dan

[Griffin]

Couldn't say without looking at an EWD and I won't have access to some till next monday. If someone else could scan and post em for a 02 and for whatever other year you pick I could go over it and let you know.

Griffin

[EzRidA]

I'll see what I can come up with. My main concern is if this doesn't work. Then I need to be able to revert back to stock safely. I don't dount my ability to do it, but I like to see what I'm getting into before I do it.

[Griffin]

Originally posted by EzRidA
I'll see what I can come up with. My main concern is if this doesn't work. Then I need to be able to revert back to stock safely. I don't dount my ability to do it, but I like to see what I'm getting into before I do it.

Changing the knock sensor itself is a very simple bolt / unbolt operation. The plug at the ECM (not boogering it up while ya mess with it) will be the hard part. As long as you dont damage the connector changing out the wires if it doesnt work it will just be a matter of putting the 2 old wires back in where they were and screwing tge knock sensor back in.

Griffin