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Automatic->Manual ECU swap wiring info

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107K views 103 replies 15 participants last post by  Yotaoffroad27  
#1 · (Edited)
As some of you know, I'm getting ready to convert my 2002 Double Cab PreRunner from auto->manual and 2wd->4wd. (SafetyDang's conversion thread; I come in around page 3.)

For my conversion I plan on swapping my 2002 auto ECU for the 2002 manual ECU. As part of the research, I thought it would be a good idea to compile a list of the wiring differences between the two ECUs. Since I push data around for a living, I took the wiring info from the factory wiring diagrams and the ECU terminal chart and built a simple database to compile this into a table that shows the automatic and manual ECU wiring side by side.

I think it turned out pretty well, although since I haven't reached this part of my conversion yet I can't say with certainty how accurate it is, except that it's as accurate as the data I had available from the factory wiring manual. Anyway, at this point I have a template for doing this, and given the appropriate starting data, it isn't too hard to make similar tables for other auto->manual conversions.

To test this last part, I asked Yotaoffroad27 to send me the wiring diagrams for his 1999 3RZ PreRunner auto->manual conversion, which resulted in this table, similar to my original.

So at this point, I think my template is reasonably solid, and since I appreciate all of the help I've received so far on my own conversions I'd like to give a little back in the form of generating similar tables for other 'Early Tacoma' auto->manual conversions. I don't know if we can cover all of the Early Tacoma years and engines, and I don't want to make this offer so open-ended that I am doing this forever, but maybe I can knock a few of these out now before I start seriously wrenching on my own project in a few weeks.

What I need if you want me to do this for you:

Send me a PM with PDFs of the ECU wiring for both transmissions. The manual ECU wiring appears in the section labeled "Engine Control (engine model number)", and the automatic/ECT wiring appears in a different document labeled "ECT Wiring" (or similar). I need both of these or I can't compile the data. I also need a PDF from the Diagnostics section of the manual that shows the ECU/ECM connectors, similar to the second document I linked to above.

Very important: These documents must be specific to your year Tacoma, or this exercise is worthless. Not all years are available for free on teh interwebs. If yours isn't available, spend $15 on a http://techinfo.toyota.com day pass and download the appropriate diagrams.

Caveats:

1. I am not responsible for any errors. I'll do my best, but ultimately it's on you. Use these tables at your own risk. That's one reason why the wiring colors are included -- always do at least a spot check of the wiring colors before plugging in the new ECU. If connector E6, Pin 1 is supposed to be Black, make sure it is before you plug in the new ECU.

2. I'm doing this for free, and I expect to post the resulting documents so everyone can use them.

3. I AM NOT AN EXPERT, AND I AM NOT GOING TO TROUBLESHOOT YOUR ECU WIRING!! I am compiling data for you to use based on the factory wiring manuals. That's it -- you get what you pay for.

4. I'm willing to put this offer out there for a few weeks, at least until all of my parts arrive and I start wrenching. I have a life, a family, and a job, so I will only work on this stuff as time permits. Now that I have a working template, I think it will take me ~60 minutes or less to hand enter the 65-90 ECU connections and generate a PDF.

5. At this time, I only want to do same year/engine auto vs. same year/engine manual, and I only want to do Early Tacomas (but am willing to do similar model 4Runners if asked).

Any takers?

-Jeff

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

UPDATE 7/6:

All done :D

Current version:
Early_Tacoma_ECUs_v2 is ready for download.

(Right Click, "Save File As...", etc. Total size is 2.7MB)

Feedback and corrections welcome. Enjoy!

-
Previous versions:
Early_Tacoma_ECUs_v1 is ready for download.
 
#2 ·
just looked over the PDF you made me. it looks GREAT! only problem i saw was E7 pin 15 the grid said it was "B" witch ment BLACK for the 2 pins before it (12, 13), but E7 pin 15 was PINK w/ a Purple tracer (Violet?). and the only other thing that threw me was apparently "L" means "BLUE". E7 pin 15 looks to be the TAC and does not deal with the transmission swap.

Thanks again for making this for me. it will be a valuable resource in the near future. you da man!:D
 
#3 ·
Good catch!



And THIS is why it's always important to check your work, LOL. Yeah, good catch -- that was a typo on my part. E8, pin 15 should be TAC; E7, pin 15 is EGR. I took another look at the material you sent me and yes, both E7-12 and E7-13 are Black.

I've updated the PDF and re-posted it.

Thanks :D

Jeff
 
#5 ·
You should do a 2002 Tacoma 3RZ Auto Prerunner to manual tranny. Remember there is no 4x4 computer...
 
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#7 ·
Sweet, maybe I need to be seriously looking for a manual ECU now. :D

Thanks in advance.
 
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#10 ·
Is it safe to assume that if you didn't list a pin number for a plug, that location is empty?

I ask because I show the D (B-W) wire going into pin 1 on E6, but you didn't list anything for it on manual or auto. There are other pins missing as well, this is just one I noticed should have a wire.
 
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#11 ·
Yes, I was faithful to the wiring guide, at least as far as I know.

When you say,"I show the D (B-W) wire going into pin 1 on E6," does this mean you see it in your truck doing this, or you see it on paper doing this? If it's in your truck, can you tell me the manufacture date from the door jam sticker? If it's from a book or PDF, can you either tell me your source (and page) or scan it/take a picture of it? I don't mean to sound demanding, but it would really help me if I did get this wrong. If my info is incomplete I'll try to get it right.

Thanks,

-Jeff
 
#12 ·
It's on this diagram, page 2-

http://www.ncttora.com/fsm/2003/Wiring_Manual/03tacoma/systemci/030ect3r.pdf

The reason I found it was because I was checking to make sure that all the wire mods I did to my park neutral position switch would not be effected should I decide to switch to a manual ECU. As of now, when my clutch is extended, my truck thinks it's in drive (B/W wire coming from the park neutral switch to the computer at pin 1 on E6) so that the cruise control works.

Edit- Now I see that the wire has a splice point and goes to both the cruise ECU and engine ECU, so i guess it doesn't really matter. I'm still curious why pin 1 on E6 isn't shown though...
 
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#13 ·
Tacoma4life said:
It's on this diagram, page 2-

http://www.ncttora.com/fsm/2003/Wiring_Manual/03tacoma/systemci/030ect3r.pdf

The reason I found it was because I was checking to make sure that all the wire mods I did to my park neutral position switch would not be effected should I decide to switch to a manual ECU. As of now, when my clutch is extended, my truck thinks it's in drive (B/W wire coming from the park neutral switch to the computer at pin 1 on E6) so that the cruise control works.
Click to expand...
;) Take a look at the footer on the PDF you linked to -- that's the 2003 wiring guide. :D There were big changes between the 2002 and 2003 Tacomas -- the 2003 had a drive by wire throttle, which lead to other changes.

I made the 2002 3RZ PDF from my (print) 2002 FSM wiring guide -- same source as the 2003 version you posted, just for the earlier year.

I don't think I have a PDF of the 2002 3RZ wiring guide, just a printed version, but if you want to verify this you can D/L a copy from the http://techinfo.toyota.com site. It's $15 for a two day pass, and you can download as much as your bandwidth will allow.

ADDED: I have the 2002 and 2003 5VZE spreadsheets posted at the top of the thread -- compare them and you'll see how there are some big differences between those two years.

Thanks for reading this as closely as you did -- this is good feedback.

-Jeff
 
#15 ·
No problem. I feel I've benefitted tremendously from your write up, Dang's thread, and especially the resources he linked to within his thread. It's allowed me to just put together a shopping list and feel confident I'm getting the right pieces, which is very nice. Projects are fun, but I spent years blazing a trail with my last project truck. I'm happy to follow someone else's footsteps this time.

It frustrated me that I couldn't find an ECU wiring comparison like the one I've posted, so I made one. Now that I have a template, I think I have an easy way to grind these out from the FSM, so I'm going to try to clear the field, at least until my other parts get here. The wiring isn't as well documented and it seems to scare folks, so let's shine some light on it. :cool:

I have one or two more FSM wiring PDFs I've found in researching my own swap, including the 2003 3RZ you linked to, but hopefully others will step up with source material and we can fill in the other gaps.

Finally, I think Toyota optimized the factory fuel and timing maps differently for the auto vs. the manual transmission vehicles, to meet CAFE requirements (fleet economy) and for emissions. That (and CA emissions) are the main reasons I want to do the ECU swap instead of keeping the auto ECU and tricking the computer. I've had enough of tricking computers :rolleyes: . If I'm going to spend the money to convert this truck to a manual, I want to drive it with the right fuel maps, the right timing maps, and no CELs. Been there, done that.

-Jeff
 
#16 ·
ok so i was lookin over the diagram you made, and was wondering if you go to a manaul ECU why do you need to cut the harness at all?? the manaul ECU isn't looking for anything from those wires... so it seams to me that it wouldn't matter if they where removed or not.... it seems that you can just plug and play and nopt have to do any harness mods
 
#17 ·
Good point, but that may or may not be true. I don't know for a fact that the internals of the ECU are blank on those pins, or that a vehicle that once had an automatic but now doesn't won't send some sort of signal, pulse, or voltage over those wires. I mean, just 'cause it shouldn't doesn't mean it won't.

It probably needs further investigation -- if they don't need to be deleted, I can change the wording to indicate that it just isn't used. If you get there first, report back and let me know, OK? :D

Jeff
 
D
#19 ·
This is an incredible offer Jeff. When mine is back on all fours, and I am tackling this issue, I'll be getting you those PDF's. My 4runner is a 1998, but the manual tranny is out of a 1998 Tacoma, does that create a headache for wiring? I have the 1998 manual ECU though.

By delete, you do mean just remove the pin connector from the plug or cut the wire right?
 
#21 ·
As long as you have the 1998 4Runner manual ECU, the source of the transmission doesn't matter -- I think the only manual trans wire is the reverse sensor, and that doesn't go through the ECU. I posted the pinouts for the 1998 4Runner, both 5VZE and 3RZ, at the top of this thread -- since I happen to have a 98 3RZ 4Runner (and the FSM for it), you sort of lucked out. :D

I have the resources for a couple more pinouts, which I may get to this afternoon or this evening. Might as well strike while the iron's hot, etc. I've got it down to about 30 minutes from start to finish, provided I have printouts of the ECU and ECT wiring diagrams.

As for deleting the unused wires: probably the first step would be to crack open a manual ECU and see if the affected pins are unused, or if they are attached to circuits. If they are unused, no harm in leaving them attached/as is. If they are wired up...I don't know. As Yotaoffroad27 pointed out, there shouldn't be any harm in leaving them connected. No CEL, no foul. No need to delete any wires unless/until the system throws a CEL.

My main motivation for doing this was to make sure there weren't going to be any conflicts on my own swap -- pins used for one function by one ECU and a different function by the other. Ironically, the only ECU swap that's indicates a conflict, at least on paper, is the one I will be using (2002 5VZE). I hope to get to the bottom of that pretty soon; hopefully, it's just a typo somewhere.

-Jeff
 
#23 ·
I'm quite certain all 3rz's use a cable throttle, it's just the 5vz's that switched to throttle by wire in 2003.
 
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#24 ·
D'oh. Of course 3RZ != 5VZE. I don't know what I was thinking.

Anyway, I've pretty much run through all the material I have and have posted the resulting tables at the top of the thread. I have one or two more to make from the 95.5 diagrams that Yotaoffroad27 sent me, but if anyone has more wiring diagrams, send them my way.
 
#34 ·
EnolaGaia and/or Johnnyboy: It seems I need the ECM terminal diagrams for the 1995.5 3RZ a/t and m/t ECUs. The PDF that Johnnyboy sent me only covers the 5VZE, which apparently used different ECUs for a/t and and m/t:

Image


The connector graphic is in the Repair > Diagnostics section of the manual. It's often labeled "terecm.pdf" or similar.

Thanks,

Jeff
 
#30 ·
With the material johnnyboy sent me yesterday, I'm complete on the early Tacomas. For both motors (sorry, 2rz owners), I have the diagrams for:

1995.5
1996
1997
1998
1999
2000
2001
2002
2003
2004

For 4Runners, I have only 1998, but I don't know if there were any significant wiring differences between 4Runner ECUs and Tacoma ECUs. Also, I don't know that I want to make entering this data my life's work.

At this point, I'm going to finish entering what I have and then will make a single, large PDF with everything. That can be shared far and wide as far as I'm concerned. If I get ambitious, I may try to do something more interactive with the data, like an application that will let you cross reference one ECU against another model year's pinouts, but that will be down the road, so to speak.

-Jeff
 
#31 ·
Mosk:

I can imagine that this turning into a lot of work but it is appreciated!!

On a side note, anyone know where to buy a stock female plug for like a 97 auto ecm so that i can make a simple jumper harness. I dont want to hack the plug out of my ECM and really dont want to pay $80 or so on ebay for a used ecm for just the plug?

Anyone have a nonworking ECM that the will sell for cheap from an auto for the 3.4?
 
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#32 ·
mosk-

i can imagine that entering all this data is alot of work. thank you for what you have done!!! maybe you can upload a generic version so people can fill in there own diagrams. maybe add a few extra pin slots an extra plug so it will cover everything. they can fill in what they need. its just an idea.. i know what your doing is getting old.
 
#33 ·
Thanks -- for the most part it's been going well, but I've been working on the 1995.5 chart most recently, and I think it was drawn by someone who never intended to actually use it for wiring -- there's a lot of WTF?!? in that one, lol. I spent a lot of time entering the data and only later realized that Toyota used completely different connectors for the 1995.5 A/T and manual ECUs. So my calculations to marry data from the manual ECU with the a/t ECU are all screwed up. Again - WTF? Because the 1995.5 uses different m/t and a/t connectors -- really completely different ECU -- it doesn't play nice like the other ECUs. Those pinouts will probably get posted as separate charts.

Anyway, I want to chew through the remaining diagrams I have and complete this little project; it's very doable, just needs a little more time. I can post some blank tables when I'm all done. So be patient, lol. I have the data for all of the early Tacos (thanks again, johnnyboy!!), I just need to work through it. The more recent ones go pretty quickly. I was going to do the remaining ones chronologically, but I may pick the low hanging fruit and come back to 1995.5.

Jeff
 
#37 ·
Got 'em - thanks!

I made a new template for these ECUs -- since the A/T and M/T ECUs don't share the same connectors, the info needs to be presented a bit differently. I'll post a few later today and you guys can tell me if it's right.

Dntsdad - you may be right about that PDF I sent you. Oh, well, no harm if I have the material twice.

Jeff
 
#38 ·
mosk,

i know you have other issues to deal with too so we ALL really appreciate your help.

about the 95.5 engine ECU diagrams, the other day when i was looking through TIS, strangely i couldn't find the ECU diagrams for the 2 and 3RZ engine auto or manual.

whatever, thanks to Enola we got that addressed.
 
#40 ·
1996 Taco 5VZE posted

As I mentioned yesterday, I discovered I needed to re-work my template to accommodate the 1995.5 - 1997 ECUs, which use different ECUs for each transmission type and thus different connectors for A/T and M/T. It's a PITA :rolleyes:

I think this new template presents the data pretty well. The 1996 Tacoma 5VZE table is posted at the top of the thread and below:

1996 Tacoma 5VZE

Comments welcome -- take a look at it and let me know what you think. Now that the template is settled I think the remaining data entry will go a little quicker, but these earlier ECUs are a bit more time consuming to enter so I can't churn them out as quickly. Still, I hope to finish everything this week as I hope to have the remaining parts for my swaps by the end of next weekend :D

Jeff
 
#41 ·
mosk22rte said:
As I mentioned yesterday, I discovered I needed to re-work my template to accommodate the 1995.5 - 1997 ECUs, which use different ECUs for each transmission type and thus different connectors for A/T and M/T. It's a PITA :rolleyes:

I think this new template presents the data pretty well. The 1996 Tacoma 5VZE table is posted at the top of the thread and below:

1996 Tacoma 5VZE

Comments welcome -- take a look at it and let me know what you think. Now that the template is settled I think the remaining data entry will go a little quicker, but these earlier ECUs are a bit more time consuming to enter so I can't churn them out as quickly. Still, I hope to finish everything this week as I hope to have the remaining parts for my swaps by the end of next weekend :D

Jeff
Click to expand...
shoooooooooooooot looks good to me. told you toyota was working some crazy harnesses back then. great work. it looks awsome and it will be a big help for years to come...... but i can already hear them now..... "do you have anything for the 2nd gen tacoma???":D
 
#42 ·
1995.5 5VZE is up:

1995.5 Taco 5VZE

Those are all the ones I have data entered for. I'll enter more data as my time permits.

Also, I apparently overlooked the fact that I have the 1998 4Runner 3rz/5vze but not the 1998 Tacoma 3rz/5vze. I don't know if there were any ECU differences between 1998 4Runners and Tacomas, but if there were I'll need those diagrams + ECU terminals to be complete.

Jeff
 
E
#44 ·
mosk22rte said:
... Also, I apparently overlooked the fact that I have the 1998 4Runner 3rz/5vze but not the 1998 Tacoma 3rz/5vze. I don't know if there were any ECU differences between 1998 4Runners and Tacomas, but if there were I'll need those diagrams + ECU terminals to be complete.
Click to expand...
Jeff:

Unfortunately, I don't have any 1998 ECM pinout diagrams.

I've forwarded you the engine control wiring diagrams for all engines, though.
 
#45 ·
Sorry, didn't know you were actively waiting for that one. I'll do it next (well, after I finish touching up the 1997 Taco 5VZE, which is pretty much done).

EnolaGaia said:
Jeff:

Unfortunately, I don't have any 1998 ECM pinout diagrams.

I've forwarded you the engine control wiring diagrams for all engines, though.
Click to expand...
Great, Enola - thanks! I have the ECU connector diagrams for the 1998 4Runner, and I'm pretty sure those are identical to the 1998 Tacoma. The pinouts are also likely the same, but I'll do a comparison to make sure. Thanks!

Jeff
 
#47 ·
Got 'em - thanks! I think that completes all of my Tacoma docs. Now I just need to chew through the data entry. :welder:

I posted the 1997 5VZE Tacoma tables at the top of the thread. I'll tackle Johnnyboy's 2001 stuff next, but I have to do some actual work first so I may not get to them immediately. If I can't get to them this afternoon, Johnnyboy, I'll get to them tonight after the kids are in bed.

BTW -- any feedback on the new format for the 1995.5-1997 tables? The 1998+ ECUs share the same connectors so they are much easier to document. The earlier stuff is confusing, so I've tried organizing it in a way that makes sense to me. Let me know what you think.

Also, an open-ended request: Before anyone actually uses these tables, please do a spot check of the wiring colors and functions, and please let me know if I've made any mistakes. I've tried to be careful, but I don't have anyone testing these after I generate them, so I don't know if I've made any errors translating the diagrams into tables. It's very easy to fat-finger a connector, pin, or color. All feedback and corrections are welcome.

Jeff
 
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