3SGTE: Gen3/Gen2 3sgte ECU pin outs

[JDMsw20]

GEN3 3S-GTE PLUG ID

BA-1/EA-3(Engine Relay/Fuse Box 18 pin)
Loc. ID Color ’91 Gen2
18-1 TC on check connector White Same
18-2 TS on check connector Yellow Same
18-3 Intake Manifold Ground Wht/Blk Same
18-4 Alternator L Terminal Yellow Same
18-5 Igniter Black Same
18-6 Water Temp Sensor Yel/Grn Same
18-7 Oil Pressure Switch Yel/Blk Same
18-8 Ignition Switch Red Same
18-9 Not Used Brn/Blk A/C VSV
18-10 Not Used Yel/Blu A/C VSV
18-11 Not Used Red Oil Level Sensor
18-12 Not Used Red/Yel AB on Check Connector
18-13 Back-Up Light Switch Red/Blk Same
18-14 Air box Temp Sensor Brown Not Used
18-15 Not Used Not Used
18-16 A/C Magnetic Clutch Blk/Wht Same
18-17 Alternator S Terminal Wht/Red Same
18-18 Not Used- Pink Cruise Control ECU
Need to connect to 16-12 on engine ECU for gen3

AB-1/EA-1(Trunk Body Harness 15 pin)
Loc. ID Color ‘91 Gen2
16-1 Tranny Speed Signal Brn Not Used (Mech. Speedo)
16-2 Not Used Grn/Red Circuit Opening Rly to ECU 26-17
Need to connect wire from gen2 to engine ECU 22-14 for gen3
16-3 Eng Comp Temp Sensor Blu/Org Same/To Cooling Fan ECU #6
16-4 Eng Comp Temp Sensor Blue Same/To Cooling Fan ECU #5
16-5 Dash Warning Light Blu/Yel Same/To Cooling Fan ECU #2
16-6 Not Used Not Used
16-7 Not Used Wht/Blk Starter Relay #3
16-8 Engine Hood Switch Red/Grn Same (TDS)
16-9 Cat EGT Pink Not Used
Need to connect to engine ECU 22-16 for gen3
16-10 Tranny Speed Sensor Vio/Wht Same/To Cruise Control ECU
16-11 Dash Boost Gauge/PIM Blu/Blk Same/From TPS
16-12 F/P Check Connector Blu/Blk Same
16-13 F/P Relay Blu/Red Not Used
Need to remove wire engine ECU 22-6 from gen2 harness and connect here for gen3
16-14 Not Used Not Used
16-15 Check Engine Light? Grn/Wht Not Used
No connection

Plus Pat's write up !

Gen3 vs Gen2 harness comparison
http://www.mrtwo.net/mr2modproject/g...n3harness1.htm

Gen3 wiring diagrams & misc info:

http://www.mrtwo.net/mr2modproject/mr2modproject.htm

[Ncturnal]

Awesome. Thanks.

[mr2man]

Anyone have the pinout from a 93+ USA SW20? I am trying to find out the differences between the 91-92 & the 93-95.

[docneon]

I adapted JDMsw20's Pinout to show 1993 USDM. There is an error in the BGB that I noted. Hope this helps.

[phoenixr2]

docneon- in response to your note on the bottom. Yes turbo models were available with out EHPS, they are more rare but I have owned a few, and no they were not converted.

[MR2SW22]

I have a 91t, and there is a wire that is tapped into, according to the chart it's a SPD wire, what does that control? i'm guessing speed sensor? maybe stock speed fuel cut?

[94st3sgte]

exaclty how do i read that, like with the numbrs for example 16-10, i am confused, i am trying to find the pip of speedo signal from the trans, how do i read the pin outs by number and match them???

[mopwer]

Got a question too. I have a USDM 93 T and need a new engine wiring harness. I found a guy that has a SW20 90-93 JDM harness. Will it swap right over or do I need to change something. Thanks.

Greg

[Jazzykova]

hey guys I bought a jdm motor(no engine/body harness& ecu) and was told that it was a 93 3sgte, but I discovered that the valve cover did not match a jdm93. It was a jdm 91-92 motor. I had bought a 91t engine/body harness and also a jdm 93 ecu before I had the motor. I already did my swap but I didn't wire up the engine harness yet. I haven't repinned anything either. what would I need to do to get my car to run properly and what kind of issues would I most likely to encounter?

[4ge]

what about 93 to 94 usdm ecu

[DJBess]

Does anyone have the pinout for a USDM 93 SW21?

[arber0214]

Originally Posted by docneon

Attachment 795I adapted JDMsw20's Pinout to show 1993 USDM. There is an error in the BGB that I noted. Hope this helps.

so if you look at the 93 usdm turbo, and 94 + gen 3 which one corresponds to ps ans psc? if anyone knows it will save me a ton of time

[TAZ]

what about NA'S?
any one have 93 5s pinout?
im tryin to put a 93 ecu to a 91
i know theres a difference but wana be sure before i go buy a new ecu

[arber0214]

Originally Posted by TAZ

what about NA'S?
any one have 93 5s pinout?
im tryin to put a 93 ecu to a 91
i know theres a difference but wana be sure before i go buy a new ecu

call the dealership and they will tell you if the ecu are the same, usually they are the same for a few years. on the turbo they are the same 91-93

[Oteck]

while the ecu pinout is nice and all but it the joining harness plug is also vital (EA1). does anyone have the wiring for the gen2 jdm for this plug or is it the same for the usdm (pin out wise)

[Foygroup]

The EA1 plug between GEN2 & GEN3 are a different pin out and a different shape. They won't plug together.

[Oteck]

i know they are different thats why i need the pin out... if they are the same layout as the usdm i can make due with that but i need to confirm that first

[Foygroup]

The first page of this thread has the pinouts under the drawings. It says EA-1 15 pin pinouts.

I followed that list and got it to work.

[Oteck]

yeah for GEN3, not gen2

[Foygroup]

Originally Posted by Oteck

yeah for GEN3, not gen2

Sorry I did not realize you were talking GEN2. I've been so tied up in my own GEN3 swap.