2jz Miata build thread - Page 19 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Build Threads Building a motor? Post the progress here.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-09-2010, 04:17 PM   #361
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

Quote:
Originally Posted by Sean View Post
On another note. I need to see if someone can give me some information. I have previously talked to Dr. Tweak about re-doing my Toyota harness witch he said he can make into a "Standalone" harness. This means I only have to piggy back a few wires into my Mazda computer for power, ground, key signal and something else. So the Toyota ECU handles the engine and the Mazda ECU handles the body. This is all fine and dandy but I think I can do it myself and save $500. I need some input on what you guys think. I need to know what and ECU in general need to run by itself. I know some of the stuff but could really use some help. Is this as simple as finding the main power, ground, key signal, starter signal, and fuel pump signal and wiring those into my mazda stuff and then letting the Toyota should handle the rest. If there is anyone in Md that would not mind meeting up one day or talking on the phone to go over this if you are good at wiring that would be awesome. I am going to Toyota today to get all the pinouts for the ECU. If there is anyone in general that is willing to take a look that would be awesome. I am a novice at wiring and I would like the help to reassure my self not that I don't think I can do it I would like some experienced help on my side.
Sean, go over to my thread in the build section, it is titled f20c engine conversion. I kind of detail the basics of how I got my two systems to work together. If you have the back part of the Toyota harness; the part that has the fuel pump wires, then it will be easy to get the car up and running.
hingstonwm is offline   Reply With Quote
Old 03-10-2010, 12:03 AM   #362
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

I took a really good look at it yesterday actually but I am working a little different I have to piggy back my toyota ecu fuel pump signal to the mazda realay and also with a couple other wires. I am thinking now it might have been easier to use the whole toyota harness and patch it into the mazda harness. Do you by chance have a god pinout of the mazda ecu maybe the one you used for your car? Also wanted to add you car is awesome this is another swap I thought about just the 2J came up me for a goo deal so that is what I went with.
Sean is offline   Reply With Quote
Old 03-10-2010, 03:28 AM   #363
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

Actually, I used the s2000 harness, then powered the miata systems by pulling power from the ignition switch of the honda system and running it into the ignition switch of the miata. What you need to do is pin out the toyota computer and figure out which wires trigger the fuel pump relay, then run those wires to the relay and that should then energize the fuel pump. Hope this helps.

Thanks for the kudos on my conversion, it has been a lot of fun to build and drive.
hingstonwm is offline   Reply With Quote
Old 03-10-2010, 12:22 PM   #364
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

Yea that helps I see a lot of wiring diagrams in my near future. What is it called when you have the ability to do something but have absolutely no desire? I hate wiring it is not per say difficult but my big *** under the dash with a soldering iron for hours on end is not fun at all, but I will do it to finish my car.lol
Sean is offline   Reply With Quote
Old 03-10-2010, 01:39 PM   #365
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

You are preaching to the choir...been there, done that, it is not fun. One thing I found was time really went by fast when I was sorting through all my wiring and identifying connections to keep and those to cut out. I don't know about your project, but S2000 wiring harness pieces are expensive and can be hard to come by, so I was really focused in order to make no mistakes.
hingstonwm is offline   Reply With Quote
Old 03-10-2010, 01:56 PM   #366
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

Yea I know the feeling I have been doing my studying so I don't mess up any of my harness I found my for a deal on Ebay because someone didn't know what they had its an actual supra harness and I got it for $200 but they are normally almost $400 so I do not want to mess it up. It will take some time but I hope to have it running in the next few weeks. Did you use the Mazda ecu to control the starter and alternator or did you use the mazda stuff only to power the Honda harness.
Sean is offline   Reply With Quote
Old 03-10-2010, 06:23 PM   #367
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

I powered the Honda harness first then the Mazda harness off of the Honda harness Let the Toyota harness power the Toyota EMC and the Toyota fuel pump relay, isolate the fuel pump wires, jump them into the Miata harness and you should be good to go. I konow it iss an over simplification but it is really not that hard. I just posted a couple of pics over on my build thread.

Last edited by hingstonwm; 03-10-2010 at 07:16 PM.
hingstonwm is offline   Reply With Quote
Old 03-10-2010, 06:42 PM   #368
Elite Member
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Quote:
Originally Posted by hingstonwm View Post
I powered the Honda harness first then the Mazda harness off of the Honda harness Let the Toyota harness power the Toyota EMC and the toyota fuel pump relay, isolate the fuel pump wires, jump them into the Miata harness and you should be good to go.
elesjuan is offline   Reply With Quote
Old 03-11-2010, 02:02 PM   #369
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

I think the toyota ecu is powered by the engine compartment fues box witch I will get from a local junk yard and then all I have to do is give it ignition, wire fuel pump relay, all the grounds, and run the other stuff like tach signal, temp, and oil pressure to the mazda dash and I should be good to go. I will cross my fingers and hope for the best.
Sean is offline   Reply With Quote
Old 03-11-2010, 02:11 PM   #370
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

Sounds like a good plan of attack. There may be some impedance difference between the tach and the fuel level sending unit. But cross that bridge when you come to it.
hingstonwm is offline   Reply With Quote
Old 03-11-2010, 02:46 PM   #371
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

The fuel sending unit will use all the stock miata stuff the only thing that toyota will interfere with the fuel is it will give the relay the on signal. The tack I think I may have to buy a MSD tach driver to convert the signal but we will see.


Dose anyone have an ECU pinout for the miata I have a pdf form of the miata manual but my computer is so slow it locks up everytime I try and open it so I am just looking for the pinout with the lables of what the pins are not a wiring diagram of circuts and all that.
Sean is offline   Reply With Quote
Old 03-11-2010, 02:56 PM   #372
Senior Member
iTrader: (2)
 
Join Date: Jan 2010
Location: Denver
Posts: 909
Total Cats: 14
Default

Quote:
Originally Posted by TurboRoach View Post
This will help then. Its the pinout for the 1.6 cars. I used it when building my adaptronic harness. You'll have to save it and then zoom in on it.

Is this what you are looking for. It was posted in this thread a a couple of pages back
hingstonwm is offline   Reply With Quote
Old 03-11-2010, 03:05 PM   #373
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

OK I am going to have to save it in a different format but it should work.

Thanks
Sean is offline   Reply With Quote
Old 03-11-2010, 08:46 PM   #374
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

All the pinouts I have got from everyone have been very helpful I am in need of one more thing. I may be dumb but I cannot find the ingnition switch signal to the ecu. I am not sure if it is in one of the body plugs or not but if anyone know where it is that would be good.
Sean is offline   Reply With Quote
Old 03-11-2010, 09:01 PM   #375
Senior Member
iTrader: (3)
 
Join Date: Aug 2005
Location: Gig Harbor, WA
Posts: 504
Total Cats: 3
Default

Thats because there isn't one. The only wire you will need to worry about is the fuel pump. You should be able to connect the Toyota fuel pump wire to the yellow connector under the dash like is done for the megasquirt.

Here is the spreadsheet I used
TurboRoach is offline   Reply With Quote
Old 03-11-2010, 09:15 PM   #376
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

Quote:
Originally Posted by TurboRoach View Post
Thats because there isn't one. The only wire you will need to worry about is the fuel pump. You should be able to connect the Toyota fuel pump wire to the yellow connector under the dash like is done for the megasquirt.

Here is the spreadsheet I used
Ok so from what I can see according to the spreadsheet you used pin 1B is power with ignition on. Can I assume that this is keyed power like a ignition signal would be and connect it to the ignition signal for the toyota ECU. Also pin 1C on my spread sheet says it goes to the circuit open relay (cntrols fuel system yellow conector under dash) and yours says pin 1C is the started signal .

For a recap I am going to connect the Toyota ignition signal wire to pin 1B witch is 12V power (with key on) same as keyed ignition switch, and connect my fuel pump signal to the yellow connector under the dash near the ECU that the wire from pin 1C runs to. Let me know if this sounds right.

Also Toyota uses a Fuel Computer and I am not running that so I am going to run a 12V switched power to the yellow connector and it will act as a theft deterrent and fuel pump signal.
Sean is offline   Reply With Quote
Old 03-11-2010, 09:57 PM   #377
Senior Member
iTrader: (3)
 
Join Date: Aug 2005
Location: Gig Harbor, WA
Posts: 504
Total Cats: 3
Default

1B is keyed +12V
1C is the circuit opening relay- the spreadsheet is mislabeled. I didn't use it so I didn't worry about it.

That sounds right. The yellow connector I'm referring to is near the steering column. I'm not sure if 1C runs to that connector. If it does I'll feel like an idiot... I just ran a wire to the yellow connector from the ecu fuel pump output.
TurboRoach is offline   Reply With Quote
Old 03-11-2010, 10:27 PM   #378
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

Is it the only big yellow connector near the steering column. I don't mean to sound like an idiot I just don't want to do this twice.
Sean is offline   Reply With Quote
Old 03-11-2010, 10:30 PM   #379
Senior Member
iTrader: (3)
 
Join Date: Aug 2005
Location: Gig Harbor, WA
Posts: 504
Total Cats: 3
Default

Yeah I think so. I'll double check when I get home tonight. If your car was running you could pull it and see if it stopped
TurboRoach is offline   Reply With Quote
Old 03-11-2010, 10:40 PM   #380
Elite Member
iTrader: (12)
 
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,521
Total Cats: 20
Default

I found it its the yellow connector that goes to the black relay under the dash next to the steering column and the fuel pump relay signal wire is the purple wire in the connector. Thanks for the help I am sure I will need more before this is over.

To sum this little bit up I am going to used 12v keyed power for the ignition signal to the Toyota ECU and a Switch for the fuel pump relay to the yellow connector under the dash.
Sean is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
elesjuan's mediocre 95 Miata adventure (google fiber edition) elesjuan Build Threads 8 02-16-2016 09:36 PM
Project DDoS: '99 "Budget" boost build ProjectDDoS Build Threads 1 09-09-2015 02:52 PM
Drummersrs old Miata, new to me foshizzle Meet and Greet 9 09-08-2015 01:26 PM
Noob here, turbo NC project starts now. turboLuigi Meet and Greet 2 09-04-2015 02:29 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:05 PM.