wire harness?

sinneDBTB · 10-04-2009, 09:37 AM

bought myself a 3.4 to swap my 3.0 got the 3.4 m/t ecu wondering if i can make a auto wire harness work? been researching the site with no definitive answers... anyone know?

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sinneDBTB · 10-04-2009, 10:32 AM

bump*

Eat_at_Joes · 10-04-2009, 09:59 PM

what type of trans are you going with behind the 3.4 after its installed? If its a manual with a manual ecu with a auto harness then i think that you could make it work. i beleive that the a/t harness has more wires sense the computer has more to monitor but if you can sort out these wires then you may be set.

now if its the a/t behind the 3.4 with the a/t harness and a m/t ecu then it will not work.

again im not for certain so do not qoute me. but it sounds logical to me.

904_runner · 10-04-2009, 10:13 PM

Yes you can make it work..

My truck was originally a 3.0L, 5-speed.

Donor motor was a 99 tacoma auto.
I used everythign from the donor and made it work with the auto ecu and harness.

So to answer your question, YES you can make it work, just takes a bit of time and research..

I just jumped the park/neutral saftey switch to make the ecu think it is in neutral the whole time..
Runs fine!

sinneDBTB · 10-05-2009, 12:01 AM

its a 90 3.0 5spd swap with a 99 3.4 5spd (not complete) but i also scored a complete but disassembled 97 3.4 auto. so my plan is to use the 99 5spd since it is newer has less km and mostly since its assembled. i want to use the 97 for parts, mostly the exhaust and wiring harness on the 99. follow? i wasnt able to get the ecu i wanted so no i have the option open to get either. so which would work better? the 97 a/t or the 99 m/t?

904_runner · 10-05-2009, 12:37 AM

i would use the 99 mt personally..

What was not complete about it?

sinneDBTB · 10-06-2009, 05:21 PM

the 99 didnt have a alt, p/s, wire harness, ecu...
but what i meant is what ECU will work best with 99 m/t engine and 97 a/t wire harness?
i want to keep my swap as cheap as possible so lil bit of extra work is no issue.

Jody · 10-06-2009, 05:59 PM

I think you'll end up wanting to use the ecu out of a 97 m/t. I did mine with the 3.4 and harness from a 98 a/t 4runner but used the ecu from a 98 m/t tacoma. everything works fine. it's a bit of a pain to wire up the back-up lights, 4wd sensor but your speedo should still be a cable. I just cut all the plugs off for the a/t and grafted on the plugs for a 3.0 m/t and made everything line up at the jumper.
Good Luck

10-04-2009, 10:32 AM	#2 (permalink)
sinneDBTB Registered User Join Date: Feb 2009 Location: British Columbia Posts: 202	bump* __________________ 90 4RUNNER V6 3VZE (5VZFE SWAP SOON!) ISR MOD / EGR MOD / 3" PERFORMANCE BODY LIFT / 1.5" OVERLOAD LIFT COILS / 1" BJ SPACERS / KYB SHOCKS / 33"X12.5" BFG M/T / 421000KM

10-04-2009, 10:13 PM	#4 (permalink)
904_runner Registered User Join Date: Mar 2008 Location: Chico, California Posts: 3,789	Yes you can make it work.. My truck was originally a 3.0L, 5-speed. Donor motor was a 99 tacoma auto. I used everythign from the donor and made it work with the auto ecu and harness. So to answer your question, YES you can make it work, just takes a bit of time and research.. I just jumped the park/neutral saftey switch to make the ecu think it is in neutral the whole time.. Runs fine! __________________ Mike 1990 4runner: 3.4 swapped, 5-speed, sas'd, Rear leaf swap, Locked, 5.29's, 39.5" iroks on Beadlocks, Armor'd Longfields, Duals coming soon: My build thread http://www.yotatech.com/f152/904_run...thread-158746/ http://www.treadlightly.org/ http://www.pirate4x4.com/tech/billav...ery/index.html Last edited by 904_runner; 10-04-2009 at 10:14 PM.

10-05-2009, 12:01 AM	#5 (permalink)
sinneDBTB Registered User Join Date: Feb 2009 Location: British Columbia Posts: 202	its a 90 3.0 5spd swap with a 99 3.4 5spd (not complete) but i also scored a complete but disassembled 97 3.4 auto. so my plan is to use the 99 5spd since it is newer has less km and mostly since its assembled. i want to use the 97 for parts, mostly the exhaust and wiring harness on the 99. follow? i wasnt able to get the ecu i wanted so no i have the option open to get either. so which would work better? the 97 a/t or the 99 m/t? __________________ 90 4RUNNER V6 3VZE (5VZFE SWAP SOON!) ISR MOD / EGR MOD / 3" PERFORMANCE BODY LIFT / 1.5" OVERLOAD LIFT COILS / 1" BJ SPACERS / KYB SHOCKS / 33"X12.5" BFG M/T / 421000KM

10-05-2009, 12:37 AM	#6 (permalink)
904_runner Registered User Join Date: Mar 2008 Location: Chico, California Posts: 3,789	i would use the 99 mt personally.. What was not complete about it? __________________ Mike 1990 4runner: 3.4 swapped, 5-speed, sas'd, Rear leaf swap, Locked, 5.29's, 39.5" iroks on Beadlocks, Armor'd Longfields, Duals coming soon: My build thread http://www.yotatech.com/f152/904_run...thread-158746/ http://www.treadlightly.org/ http://www.pirate4x4.com/tech/billav...ery/index.html

10-06-2009, 05:21 PM	#7 (permalink)
sinneDBTB Registered User Join Date: Feb 2009 Location: British Columbia Posts: 202	the 99 didnt have a alt, p/s, wire harness, ecu... but what i meant is what ECU will work best with 99 m/t engine and 97 a/t wire harness? i want to keep my swap as cheap as possible so lil bit of extra work is no issue. __________________ 90 4RUNNER V6 3VZE (5VZFE SWAP SOON!) ISR MOD / EGR MOD / 3" PERFORMANCE BODY LIFT / 1.5" OVERLOAD LIFT COILS / 1" BJ SPACERS / KYB SHOCKS / 33"X12.5" BFG M/T / 421000KM

10-04-2009, 09:59 PM	#3 (permalink)
Eat_at_Joes Registered User Join Date: Apr 2009 Location: Green River, Wyoming Posts: 16	what type of trans are you going with behind the 3.4 after its installed? If its a manual with a manual ecu with a auto harness then i think that you could make it work. i beleive that the a/t harness has more wires sense the computer has more to monitor but if you can sort out these wires then you may be set. now if its the a/t behind the 3.4 with the a/t harness and a m/t ecu then it will not work. again im not for certain so do not qoute me. but it sounds logical to me.

10-06-2009, 05:59 PM	#8 (permalink)
Jody Registered User Join Date: Apr 2009 Posts: 24	I think you'll end up wanting to use the ecu out of a 97 m/t. I did mine with the 3.4 and harness from a 98 a/t 4runner but used the ecu from a 98 m/t tacoma. everything works fine. it's a bit of a pain to wire up the back-up lights, 4wd sensor but your speedo should still be a cable. I just cut all the plugs off for the a/t and grafted on the plugs for a 3.0 m/t and made everything line up at the jumper. Good Luck Last edited by Jody; 10-06-2009 at 06:05 PM.

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