3SGE Harness question

MR2enV · 04-22-2008, 11:31 PM

Has anyone ever tried to wire up a second gen 3SGE. the part that is cut on my harness is the part that goes to the cabin.. If so,how hard was it,and where can I get a wireing diagram from. thanks

mr220v · 04-23-2008, 02:18 PM

So your body harness is cut?

All you really need is the engine harness. If the harness is of the same year as your mr2, it's especially easy.

When I did my 2nd gen swap, I had a 91 mr2, and a 91 3sge engine harness and ecu. The body harness plugs were the same. The only change I had to make was the ecu body plug. I switched it for a 22pin connector from a 91 previa.

The pinouts will be printed on the ecu's pcbs. You're basically going to be matching +b with +b, batt with batt, etc....

The only other difference is that you'll have to run a wire for STA from that pin on the 22pin connector to the starter solenoid wire.

I have made adapters for the ecu plug problem.

MR2enV · 04-24-2008, 05:20 PM

I have the body plug that came with the jdm motor. i pluged the body harness plugs to the engine harness plugs and that part is done....... now, there is the ECU plug that comes from the body is different from the 3SGE ECU..... the wires that are coming from the ecu body plug are the same colors as the JDM one but they are in different ports. The JDM plug has more wires though, does this mean I can wire it color to color and the extra wires on the harness will not be used.

MR2enV · 04-24-2008, 09:54 PM

allright i did what i thought i couldnt do and I wired up the ecu plug. All the lights work im getting fuel it cranks and everything.......But im not getting spark What do you think that is..... Oh yae there is a female plug that is with the engine harness plug and that is supposed plug into a body harness plug all the wires are different and I dont kno what to do about that. Oh and I cant find the O2 sensor plug any ideas where it is

b12ian86 · 04-24-2008, 10:18 PM

I'm having the same exact problem dude.....i have a 91 with a 93 gen2 motor and i don't know what to do...

mr220v · 04-25-2008, 11:12 AM

Hmmm.... The 3sge harness plugged up, but you're not getting spark now?

If it's turning over, that means the trunk body plug plugs up and is the same year approximately.

Is your coil/igniter bracket grounded? If not bolt it to the chasis in the stock location.

MR2enV · 04-25-2008, 07:23 PM

yea the coil and ignitor plug is grounded in stock position. I used a test light on the wires that go to the igniter and all the wires are dead..... there is a plug that comes from the body side that has three wires do i need any of these. this is getting fustrating

MR2enV · 04-25-2008, 09:39 PM

Every single thing works but its just not getting spark what do i do. Could it be the harness

b12ian86 · 04-26-2008, 03:50 AM

I'm e-mailing some guy named dr tweak....someone told me that i need to change the body harness because there are some wires that the 93 has and the 91 doesn't. I think i'm going to try to see if that;ll work...ill let you know

mr220v · 04-28-2008, 06:45 PM

Check the 8pin connector in the fuse box. This is where the power for the igniter (among other things) comes from. What you may notice when you pull the plug out is that there are a few wires on the harness that don't have corresponding pins in the fuse box.

These will most likely be the black and red 12v power wires. If you bridge the one that has the 12v pin to the ones that don't, you will get power to your igniter.

This is most likely what is going on with both of your coversions.

In addition, b12ian86 will need to bridge +b and fc on his diagnostic connector to get fuel going if no wiring has been done for the fuelcontrol circuit.

b12ian86 · 04-28-2008, 09:20 PM

Quote:

Originally Posted by mr220v

Check the 8pin connector in the fuse box. This is where the power for the igniter (among other things) comes from. What you may notice when you pull the plug out is that there are a few wires on the harness that don't have corresponding pins in the fuse box.

These will most likely be the black and red 12v power wires. If you bridge the one that has the 12v pin to the ones that don't, you will get power to your igniter.

This is most likely what is going on with both of your coversions.

In addition, b12ian86 will need to bridge +b and fc on his diagnostic connector to get fuel going if no wiring has been done for the fuelcontrol circuit.

ill give that a shot....but your saying i can use a 91 body harness and connect it to a 93 engine harness right?

MR2enV · 04-28-2008, 09:32 PM

MR220V was right.... I pulled the pins out of the JDM harness and bridged them and now im getting power.... It started up today..... But it wont Idle.. I checked all the connections and I cant find the problem... It idles if you hold the gas just a little bit but if you try to accelerate it just dies out.... what do you think that is?

mr220v · 04-28-2008, 10:41 PM

jumper +b and fc on your diagnostic connector. If it starts and runs, recheck your FC pin wiring.

jer · 04-29-2008, 05:32 AM

is the previa connector necessary?
thanks

MR2enV · 04-29-2008, 10:23 PM

If the JDM harness comes with the 22 pin then just use it........ My car is finally running. The ACIS (the sensor under the throttle body) was full of carbon so i cleaned it out and the fuel pressure regulator was bad. I purchased an adjustable one from a local shop..... My car idles strong and and revs Beautifully........ Thank you MR220v, you have been alot of help

MR2enV · 04-29-2008, 10:25 PM

Im going to be posting some tips and pics of what to do..... For the swap

jer · 05-01-2008, 04:39 PM

hopefully everything works out!

Actimel · 06-03-2008, 05:53 PM

Quote:

Originally Posted by MR2enV

Im going to be posting some tips and pics of what to do..... For the swap

hello . Sorry for back with this post but have You MR2enV any pics with tips of what to do ...with ecu pin?

my car is 91 3sge made on 3sgte gen2 jdm (i have the 2 ecu 3sge and 3sgte jdm.... Which ecu will be better ?)

04-22-2008, 11:31 PM	#1 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	3SGE Harness question Has anyone ever tried to wire up a second gen 3SGE. the part that is cut on my harness is the part that goes to the cabin.. If so,how hard was it,and where can I get a wireing diagram from. thanks

04-29-2008, 05:32 AM	#14 (permalink)
jer No Skills Join Date: Nov 2007 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	also going for a swap, any tips? is the previa connector necessary? thanks

05-01-2008, 04:39 PM	#17 (permalink)
jer No Skills Join Date: Nov 2007 Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	thanks for the tip hopefully everything works out!

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04-23-2008, 02:18 PM	#2 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,255 Thanks: 13 Thanked 90 Times in 76 Posts iTrader Rating: (7/100% )	So your body harness is cut? All you really need is the engine harness. If the harness is of the same year as your mr2, it's especially easy. When I did my 2nd gen swap, I had a 91 mr2, and a 91 3sge engine harness and ecu. The body harness plugs were the same. The only change I had to make was the ecu body plug. I switched it for a 22pin connector from a 91 previa. The pinouts will be printed on the ecu's pcbs. You're basically going to be matching +b with +b, batt with batt, etc.... The only other difference is that you'll have to run a wire for STA from that pin on the 22pin connector to the starter solenoid wire. I have made adapters for the ecu plug problem.

04-24-2008, 05:20 PM	#3 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	I have the body plug that came with the jdm motor. i pluged the body harness plugs to the engine harness plugs and that part is done....... now, there is the ECU plug that comes from the body is different from the 3SGE ECU..... the wires that are coming from the ecu body plug are the same colors as the JDM one but they are in different ports. The JDM plug has more wires though, does this mean I can wire it color to color and the extra wires on the harness will not be used.

04-24-2008, 09:54 PM	#4 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	allright i did what i thought i couldnt do and I wired up the ecu plug. All the lights work im getting fuel it cranks and everything.......But im not getting spark What do you think that is..... Oh yae there is a female plug that is with the engine harness plug and that is supposed plug into a body harness plug all the wires are different and I dont kno what to do about that. Oh and I cant find the O2 sensor plug any ideas where it is

04-24-2008, 10:18 PM	#5 (permalink)
b12ian86 No Skills Join Date: Jun 2007 Posts: 33 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	I'm having the same exact problem dude.....i have a 91 with a 93 gen2 motor and i don't know what to do...

04-25-2008, 11:12 AM	#6 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,255 Thanks: 13 Thanked 90 Times in 76 Posts iTrader Rating: (7/100% )	Hmmm.... The 3sge harness plugged up, but you're not getting spark now? If it's turning over, that means the trunk body plug plugs up and is the same year approximately. Is your coil/igniter bracket grounded? If not bolt it to the chasis in the stock location.

04-25-2008, 07:23 PM	#7 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	yea the coil and ignitor plug is grounded in stock position. I used a test light on the wires that go to the igniter and all the wires are dead..... there is a plug that comes from the body side that has three wires do i need any of these. this is getting fustrating

04-25-2008, 09:39 PM	#8 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Every single thing works but its just not getting spark what do i do. Could it be the harness

04-26-2008, 03:50 AM	#9 (permalink)
b12ian86 No Skills Join Date: Jun 2007 Posts: 33 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	I'm e-mailing some guy named dr tweak....someone told me that i need to change the body harness because there are some wires that the 93 has and the 91 doesn't. I think i'm going to try to see if that;ll work...ill let you know

04-28-2008, 06:45 PM	#10 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,255 Thanks: 13 Thanked 90 Times in 76 Posts iTrader Rating: (7/100% )	Check the 8pin connector in the fuse box. This is where the power for the igniter (among other things) comes from. What you may notice when you pull the plug out is that there are a few wires on the harness that don't have corresponding pins in the fuse box. These will most likely be the black and red 12v power wires. If you bridge the one that has the 12v pin to the ones that don't, you will get power to your igniter. This is most likely what is going on with both of your coversions. In addition, b12ian86 will need to bridge +b and fc on his diagnostic connector to get fuel going if no wiring has been done for the fuelcontrol circuit.

04-28-2008, 09:32 PM	#12 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	MR220V was right.... I pulled the pins out of the JDM harness and bridged them and now im getting power.... It started up today..... But it wont Idle.. I checked all the connections and I cant find the problem... It idles if you hold the gas just a little bit but if you try to accelerate it just dies out.... what do you think that is?

04-28-2008, 10:41 PM	#13 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 1,255 Thanks: 13 Thanked 90 Times in 76 Posts iTrader Rating: (7/100% )	jumper +b and fc on your diagnostic connector. If it starts and runs, recheck your FC pin wiring.

04-29-2008, 10:23 PM	#15 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	If the JDM harness comes with the 22 pin then just use it........ My car is finally running. The ACIS (the sensor under the throttle body) was full of carbon so i cleaned it out and the fuel pressure regulator was bad. I purchased an adjustable one from a local shop..... My car idles strong and and revs Beautifully........ Thank you MR220v, you have been alot of help

04-29-2008, 10:25 PM	#16 (permalink)
MR2enV WHY SO SERIOUS? Join Date: Mar 2007 Location: Miramar, Florida Posts: 138 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Im going to be posting some tips and pics of what to do..... For the swap