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4TH gen GT GTS All-Trac 3sgte upgrade

Discussion in 'Aftermarket Modifications' started by ST165-2765, Oct 3, 2012.

  1. ST165-2765

    ST165-2765 Well-Known Member Donated!

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    Harness Connectors Firewall End Of Engine Harness

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    Above is a list of various plugs and harness connectors that connect a 3sge engine wiring
    harness to the rest of the car. These are the connections that your new engine will have to
    connect to. Below is a detailed look at how various wires and plugs were traced and other
    considerations that need to be made when upgrading to a 3sgte.

    So you got a 4th gen and you want to stuff a bit more power in it with a 3sgte.

    What you need
    -3sgte
    -3sgte engine wiring harness and all the sensors/electronics that connect to it
    (afm/maf, coil, igniter, AC sensors, O2 sensors, water temp, oil pressure, ECU........ )
    -all intercooler bits
    -downpipe

    If your starting with a GT or All-Trac your good to go
    If you have a GTS your starter is probably going to be under the exhaust manifold
    where the new turbo is going to be so your going to need to modify your tranny
    to accept a GT or All-Trac starter and you will also need the clutch and flywheel
    from the GT or All-Trac, you can also find the clutch flywheel and starter on camry's.
    Other option is to replace the tranny with a GT or camry tranny once again you will
    also need the clutch flywheel and starter.

    So now your ready to get going. Right now you should be looking at a 3sgte engine
    wiring harness that has all its plugs connected to bits you got with the engine except
    for a few plugs at one end of the harness that connect to the battery and engine bay
    fuse box. The following picture shows a 4th gen 3sge engine wiring harness battery end.
    You will need to take some of these plugs and splice them into your 3sgte harness so
    your 3sgte harness can plug into the 4th gen engine bay fuse box.
    [​IMG]

    2B, 2C, 2G, 2H are the only plugs you should need from your old 3sfe,3sge engine wiring harness, all the other plugs ont the engine wiring
    harness are engine related the only exception I can think of is 2 plugs for the tranny for a speed sensor and reverse indicator.
    [​IMG]

    If you got an ST165 engine to install your good to go its all just plug and play. The ST165 3sgte engine wiring harness has plugs 2B, 2C, 2G, 2H
    allready on it so you don't have to splice anything just plug the ST165 engine wiring harness into the 4th gen engine bay fuse box. You may
    have to wire up the intercooler pump as I'm not sure if its on the engine wiring harness or engine bay wiring harness but other than that putting
    in an ST165 engine is going to be the easiest.

    If you want to put in an ST185, ST205, ST215 engine your going to have to modify the new engine wiring harness to plug into the 4th gen engine
    bay fuse box. These should be the only connections on you new harness that don't connect to a part of your new engine or electronic bits that
    came with the engine. So we have to look at the 4th gen engine bay fuse box
    [​IMG]

    It does not matter if you have a GT GTS or All-Trac all the fuse boxes are the same. GT & All-Trac fuseboxes are identical GTS fuse boxes look
    slightly different but all the plugs/locations are the same. Heres whats going on inside the fusebox.
    [​IMG]

    So what we need to do is identify what the wires for the 4 plugs are for
    Plug 2B
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    Plug 2C
    [​IMG]

    [​IMG]

    Plug 2G
    [​IMG]

    [​IMG]

    Now that we know what the plugs and wire colors are we need to check the electrical diagrams
    to see what the wires do.
    [​IMG]

    closeup
    [​IMG]

    [​IMG]
    In this case I'm going to start looking at
    Plug 2B
    Pin 1 red - 12 volts coming out of the fuseable link box
    Pin 2 white - 12 volt 40 amp AM1 fuseable link
    Pin 3 white - 12 volt 40 amp AM1 fuseable link
    Pin 4 black with red stripe - 12 volt 30 amp AM2 fuseable link
    Pin 6 yellow - "L" terminal of the altenator

    [​IMG]

    [​IMG]

    [​IMG]
    Plug 2C
    Pin 1 green with black stripe - A/C high pressure switch(radiator fan) 3sge
    Pin 3 white with black stripe - circuit opening relay pin6, air flow meter pin 2, vsv(for engine idle up) pin 1, cruise control vacuum pump,
    cruise control vacuum switch, cruise control switch(comb. sw)
    Pin 4 green with black stripe -
    Pin 6 black with white stripe - A/C magnetic clutch

    Plug 2G
    Pin 2 pink - TCCS ECU pin 2
    Pin 3 black with orange stripe - plug 2G pin 6
    Pin 4 yellow - charge warning light (combination meter)
    Pin 5 black with yellow stripe - circuit opening relay pin 2, TCCS ECU pin 14, TCCS ECU pin 13,check connector pin 12, oxygen sensor pin 2, vsv (for T-vis) pin 2
    Pin 6 black with orange stripe - plug 2G pin 3

    Plug 2H
    Pin 1 white - 12 volt 40 amp AM1 fuseable link


    With all that being said there is one more thing to consider. If you get a JDM engine the engine wiring harness will be for a
    right hand drive car. Its going to want to have the part of the harness that goes to the ECU go through the firewall on the
    drivers side not near the windshield wiper motor on the passenger side so just one more problem to solve


    That should get you a running engine, later I'll look at some extra's that would be nice to have like hooking up the sensors
    in the engine to the instrument cluster.
     
    Last edited: Oct 5, 2012
  2. lone wolf

    lone wolf Well-Known Member Donated!

    nice write up ! I was so lucky to have the complete wiring from my old alltrac which made things very easy :)
     
  3. Seank90

    Seank90 Well-Known Member Donated!

    Excellent stuff! Vote on sticky??
     
  4. Redrkt01

    Redrkt01 Well-Known Member

    I second that. No one has ever gone so far as to post pics of the EWD outlining how you should be thinking about the process or the method to follow through with it.
     
  5. ST165-2765

    ST165-2765 Well-Known Member Donated!

    I've updated the listing for the 4 plugs that connect to the engine bay main fusebox

    color green indicates the plug number and pin number
    color black indicates what the wire connects to once it leaves the fusebox
    color red indicates what the internal connection is within the fusebox

    Plug 2B
    Pin 1
    red - 12 volts coming out of the fuseable link box
    --- headlight relay pin 3
    Pin 2 white - 12 volt 40 amp AM1 fuseable link
    --- plug 2D pin 1
    Pin 3 white - 12 volt 40 amp AM1 fuseable link
    --- plug 2F pin 1
    Pin 4 black with red stripe - 12 volt 30 amp AM2 fuseable link
    --- plug 2F pin 4
    Pin 6 yellow - "L" terminal of the altenator
    --- 7.5A charge fuse

    Plug 2C
    Pin 1
    green with black stripe - A/C high pressure switch(radiator fan) 3sge
    --- plug 2A pin 1
    Pin 3 white with black stripe - circuit opening relay pin6, air flow meter pin 2, vsv(for engine idle up) pin 1, cruise control vacuum pump,
    cruise control vacuum switch, cruise control switch(comb. sw)
    --- EFI main relay pin 3, plug 2E pin 5, engine main relay pin 3, engine main relay pin 2, plug 2A pin 7
    Pin 4 green with black stripe - radiator fan water temp switch
    --- plug 2E pin 2, radiator fan relay no 1 pin 2, plug 2A pin 8
    Pin 6 black with white stripe - A/C magnetic clutch
    --- plug 2E pin 6

    Plug 2G
    Pin 2
    pink - TCCS ECU pin 2
    --- EFI main relay pin 4, 15A EFI
    Pin 3 black with orange stripe - plug 2G pin 6
    --- plug 2E pin 1, radiator fan relay no 1 pin 1, engine main relay pin 1
    Pin 4 yellow - charge warning light (combination meter)
    --- 7.5A charge
    Pin 5 black with yellow stripe - circuit opening relay pin 2, TCCS ECU pin 14, TCCS ECU pin 13,check connector pin 12, oxygen sensor pin 2, vsv (for T-vis) pin 2
    --- EFI main relay pin 2
    Pin 6 black with orange stripe - plug 2G pin 3
    --- EFI main relay pin 1

    Plug 2H
    Pin 1
    white - 12 volt 40 amp AM1 fuseable link
    --- engine main relay pin 5

    As I said before I still have to do the wiring for the instrument cluster, I would have thought they would have gone
    through on the drivers side but I guess their all taking the long route. I did say before that at this point you should
    be able to start the motor but I have noticed that the starter wire is not included in one of the 4 plugs so I'll have
    to track that one down as well although technically you could jump the starter and get the engine running
     
    Last edited: Oct 5, 2012
  6. ST165-2765

    ST165-2765 Well-Known Member Donated!

    Looking at the other end of the engine harness just before it goes through the firewall their are
    2 connectors that join to other wiring harnesses. Their identified as connectors C1 & C2
    [​IMG]

    At the end of the harness are several more plugs most go to the ECU one goes to the circuit
    opening relay and G1 is a connector to another wiring harness
    [​IMG]

    G1
    [​IMG]
    pin 1 blue with white stripe - TCCS ECU pin 7
    --- speed sensor (comb. meter) pin 1
    pin 2 black with yellow stripe - altenator pin 3
    --- 10A engine fuse
    pin 3 yellow - 7.5A charge fuse pin 4
    --- charge warning light (comb. meter)
    pin 4 yellow with green stripe - water temp sender
    --- water temp guage pin 3
    pin 8 red with blue stripe - back up light switch pin 2
    --- 15A guage fuse pin 2
    pin 9 red with black stripe - back up light switch pin 1
    --- back up lights pin 2

    G1
    [​IMG]
    pin 10 blue with black stripe - check connector pin 1 (FP)
    --- fuel pump pin 1, circuit opening relay pin 1
    pin 11 orange - diode (electrical idle up) pin 2
    --- TCCS ECU ISCV (3sge), VSV (engine idle up) (3sge), TCCS ECU ELS (3sgte)
    pin 12 yellow with black stripe - oil pressure switch
    --- oil pressure guage pin 2
    pin 13 green - TCCS ECU pin 19
    --- chechk engine (comb. meter)
    pin 16 black - igniter pin 6
    --- tachometer pin 4
    pin 17 brown - ground
    --- water temp pin 6

    C2
    [​IMG]
    pin 1 black - starter, circuit opening relay pin 3, TCCS ECU pin 3(STA), TCCS ECU pin 1(NSW)
    --- starter relay pin 2
    pin 2 black with orange stripe - ignition coil pin 1, igniter pin 3, noise filter pin 1, injectors 1 2 3 4 pin 2,
    --- ignition switch IG2 pin 7
    pin 4 white - 40A AM1
    --- 30A heater CB

    C1
    [​IMG]
    pin 1 white with blue stripe - A/C compressor sensor pin 2
    --- A/C amplifier pin 16
    pin 2 blue - speed sensor pin 1
    --- cruise control computer pin 7
    pin 3 green with red stripe - stop light switch
    --- TCCS ECU pin 6
    pin 4 white with red stripe - A/C compressor sensor pin 1
    --- A/C amplifier pin 9, A/C thermistor pin 1
    pin 5 black - igniter pin 4
    --- A/C amplifier pin 10
    pin 6 brown - speed sensor pin 2
    --- cruise control computer pin 13

    [​IMG]

    That should take care of all the connections(plugs) on the engine wiring harness that don't connect dirrectly to the engine
    or one of its electrical components. I'll try to clean it all up a bit and post some additional relevant info
     
  7. scottjackson1209

    scottjackson1209 Well-Known Member Donated!

    Okay so my engine is now out and I have a committed buyer...the harness is going with the engine so I dont want to start cutting into it...so I have a few questions here...

    I'm switching to a ST205 engine/trans/ecu/wiring. Will all my gauges etc work with this swap? is that were Re-Pining the "G1" connector comes in? could I just cut a connector out of a GT at the wreckers and re-pin it to work?

    I think this G1 connector behind the dash is the only one i'm confused about. I kept the fuse box with my body harness so I can just move the fuses/wiring to the other fuse box correct?

    Honestly i'm TERRIBLE at troubleshooting and reading these wiring diagrams...if anyone knows of a detailed writeup with the ST165 and ST205 wiring diagrams so that I know EXACTLY what i need to re-wire that would be great!



    a couple of other questions. Will the Tach and water temp gauges work with this ECU? Is that part of Re-pining the G1? also the ignition goes through G1 right? so I can't start the engine with the key until I get the G1 re pinned correct?

    I've read through this thread several times and still can't seem to make perfect sense of it...maybe when my engine gets here tomorrow it will make a bit more sense
     
  8. Derek Buckles

    Derek Buckles New Member

    Would you mind updating the pictures? Your post has been very helpful in my swap. I just can't see the pics anymore.
     

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