[Josh S]

I have been working on this guide during the install of my ProEFI and now that I've confirmed that everything is working ok I've decided to post it here. DaveT has posted a great install guide over in the SP section. We did a few things a bit differently so I figured I might as well put mine out there as well in case it helps someone.

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The following guide is how I connected my ProEFI 128 system into my 1995 6-Speed. I cannot confirm that the wire colors and connectors are the same for obd2 Supras.

Installation tips:
I perfer to solder and heat shrink all connections
The pins for additional wires to the ProEFI harness can be crimped with pliers and then soldered
Instructions for connecting the iBoost knob, CAN display cable, and wideband sensor are included with the ProEFI so I did not cover them here.


Items that can be removed:

Here is a list of some of the items that can be safely removed when the ProEFI is installed with a single turbo and upgraded fuel system.
All of the VSV’s that controlled the stock turbo system
The pressure tank and its VSV
The EGR vsv (if you have also removed the EGR system and have block off plates)
The stock FPR and FPR VSV
The TRAC ECU
The fuel pump ECU
The stock turbo pressure sensor


Traction control:

For the traction control connections to the wheel speed sensrs must be made.

Driven Wheel Speed Input (J1 A01)
Non-Driven Wheel Speed Input (J1 A12)
Wheel Speed Return (J1 A32)

The wheel speed sensor wires can be accessed at the ABS ECU which is behind the radio. After removing the dash panels and radio, locate the ABS ECU.

You need to get to the two left plugs shown unplugged here:

Unplug all three connectors and pull back the carpet on the drivers side to allow you to pull the harness out the side of the center console. You need to make connections to the White wire (Front LH sensor wire Pin 5) on the large connector and the purple wire (Rear LH sensor wire Pin 9) on the smaller connector and the light green wire (Return pin 1) smaller connector.

reconnect the three connectors to the ABS ECU and run the two tapped wires to the ProEFI harness.

Connect the shield ground to a good ground near the ABS ECU. You can see I connected the shield to the bolt on the left in this picture.

Connect the wire connected to the white wire to (J1 A12), the wire connected to the purple wire to (J1 A01). Splice the wire connected to the light green wire (return) to (J1 A32). Note that for some reason my harness came with these two line already connected to the ECU harness as if I had an automatic transmission. Just remove the wires from the ProEFI connector and insert the two wires from the speed sensors.

Trac Switch Input (J1 C11)
Trac Active Light Output (J2 B21)
Trac Enabled Output (J2 B02)

The TRAC Switch, the “TRAC OFF” light, and the “TRAC” light, and can all be wired to the connector that went to the stock TRAC ecu right next to the main ECU. There is a 26-pin connector here. Connect (J1 C11) to the light green wire, pin 5. Connect (J2 B21) to the White wire pin 24. Connect (J2 B02) to the light green/red stripe wire, pin 23.

Below is the connector from the TRAC ECU.

Here are the three wires I connected to:

Note, you must also cut the light green/red wire at the ABS/TRAC relay box on the passenger side of the engine bay. I do not have a picture of this. If this wire is not cut, the "TRAC OFF" light will be forced on all the time.

 

[Josh S]

MAP sensor:

Install the pressure sensor into the intake manifold where the stock filter nipple was installed:

Note you may have to run a 1/8" NPT tap into the intake manifold as I believe the stock threads are slightly different. Also use some teflon tape or thread sealer on these threads.

The pressure sensor has three wires to connect:

Red = 5V reference
Black = Ground
White = Signal

The ProEFI harness connects (J1 A29) to ECU pin B62 which goes to the stock pressure sensor connector. Locate the stock turbo pressure sensor connector:

Make the following connections:

Red to Blue/Red stripe
Black to Brown/Black stripe
White to Black/Yellow stripe

Fuel Pressure Sensor:

I installed the Fuel Pressure sensor directly to the unused port on the FPR using a MagnaFuel -6AN to 1/8NPT adapter (Part number MP-3071).

Use thread sealer on the NPT threads of the pressure sensor.

FPR Installed to extra side port of FPR here:

The pressure sensor has three wires to connect:

Red = 5V reference
Black = Ground
White = Signal

I decided to re-purpose the stock secondary trac throttle position sensor harness for the fuel pressure sensor.

Picture of connector:

Make the following connections:

Red to Blue/Red stripe
Black to Brown/Black stripe
White to Yellow/Blue stripe

The Yellow/Blue stripe wire connects to ECU terminal B42. At the ProEFI harness connect the wire from ECU B42 to ProEFI pin (J1 A30), by crimping a pin to the ECU lead and inserting it into the ProEFI connector housing.

Picture of pin crimped and soldered to the B42 wire:

IAT Sensor:

I installed the IAT sensor low on the IC pipe that goes to the throttle body.

The ProEFI harness connects (J1 C12) to ECU pin B45 which goes to the stock MAF plug. Conect the IAT sensor to the Pink/Blue stripe (signal) and the Brown/Black stripe (ground).

Below is a picture of the two IAT wires from the MAF connector that have been re-routed to the throttle body side:

Here is where I mounted my IAT sensor. It is a ⅜” NPT thread:

Note that the pins for the IAT sensor are inserted into the front of the supplied connector. This means you must pass the wires through the connector before crimping/soldering the terminals on:

 

[Josh S]

Boost Control Solenoid:

The ProEFI harness connects (J2 B18) to ECU pin B60 which goes to the stock wastegate VSV. The wires are Black/Red stripe (power) and Blue/White stripe. It does not matter which wire goes to which side of the solenoid.

These wires exit at the front of the spark-plug cover (near the water neck).

Picture of wires:

First you need to crimp the contacts onto wires to mate with the connector that comes on the solenoid. Put the green rubber boots on and crimp then solder the contacts as pictured:

Insert the pins and close the connector cover:

Solder this cable to the stock wires. I routed the cable under the spark plug cover to the rear of the valve cover and out along the firewall:

Here is where I mounted the solenoid:

Fuel Pumps:

I decided to wire the relay’s directly to the ProEFI individually, as this allows for staging of the fuel pumps so that only one pump will run at cruise and light load and the 2nd will come on at higher load where it is needed.

At the connector for the stock fuel pump ECU, connect the purple/white stripe to one relay coil and the green to the other relay coil. The opposite sides of the relay coil should both be connected to the switched 12V feed which is the blue/orange stripe wire.

At the ProEFI harness move the pin from (J2 B07) to (J2 B17). This will connect the ProEfi outputs LS05 and LS07 to the two wires we tapped into at the fuel pump ecu. Note that these are low side outputs, meaning they connect to ground to turn on.

The green wire is ECU pin A21, and the purple/white stripe is ECU pin A22.

(Again my harness had a wire already in the (J2 B17) terminal which is used for an auto transmission, for a 6-speed just remove this pin)

 

[Josh S]

Methanol Injection

After a lot of research and thinking about my methanol injection system I decided to purchase an AEM injection monitor gauge to use in conjunction with the ProEFI as a failsafe measure.

I am using the ProEFI to progressively control my meth pump and adjust the fuel trims and the AEM monitor will provide feedback should anything go wrong. The AEM monitor has a flow meter that is installed before the meth nozzle. Once it is all installed you can connect the gauge via USB and run a baseline injection flow rate vs. duty cycle curve. You then set high and low limits around this baseline.

For example a clogged nozzle will show up as low flow and trip a fault, likewise a high flow (popped off hose) will trigger a high flow fault. I connected it so that a fault will automatically change my iBoost setting to 1 (base boost) and tell the ProEFI to turn off the meth injection thus removing the meth fuel trims. The system is wired is such a way that anytime the ProEFI is calling for meth (pulsing the output to my solid state relay) the AEM monitor will see it and check for the correct amount of flow. This is true even if the fuse, relay, or pump goes bad.

My connection schematic is below:

Now on to the install of the gauge itself. I decided to install it to the left of the steering wheel where the dimmer controls are. I realize that this is not a great location for visibility, but the whole point of how I've designed the system is that it will work automatically so I don't need to monitor the gauge. The whole gauge and needle also blink on a fault so it is easy to see that. I don't like A-pillar gauges and didn't want to cut any of the bracing behind the gauge panels so this was the best location for me.

I drilled a 2" hole with a hole saw:

After a couple passes around the hole with a sanding wheel on a dremmel the gauge fit right in:

I relocated the dimmer to below the dash here.

I added the recommended AEM filter to the line going from my tank to the pump:

Installed the flow meter right before the nozzle:

Ran the line from the flow meter inside the fender and inside the car to the gauge:

Here is all the wiring ready for the gauge to be installed:

For the toggle switch that I can use to turn the meth on/off I found a project box I had laying around and mounted the switch to that which I then placed in the glove box. I left some room so I can add additional switches as needed (anti-lag control is one I may add)

Here is the gauge installed and powered up:

 

[Josh S]

Flex Fuel Sensor

After E85 became somewhat available in my area, I switched over to flex fuel and no longer use the meth injection.

For the Flex fuel sensor I bought a GM 13577394 sensor. This is the new flow-through design sensor.

For the harness I bought the following from Mouser Electronics and made it myself (I found this info elsewhere on the forums):

Delphi GT 150 series connector QTY:1, part # 13519047 (you have to remove two tabs from the sensor side to fit this connector).

Delphi GT 150 series Terminals QTY:3, Gold part# 15326427

Delphi Loose Cable Seal QTY:3, part# 15366021

For wiring I re-purposed the stock main o2 sensor wires. These run across the front of the valve covers. I re-routed these to the driver side and spliced in there.

There are four wires that went to the stock o2 sensor.

White (shielded) - Unused
Black-Red = Switched 12V, connect this to the +12V terminal of the sensor
Brown = Ground, connect this to the ground of the sensor
Black-Blue = Signal, connect this to the signal terminal of the sensor

The Black-Blue wire goes to the stock ECU terminal position B71. This should be connected to the ProEFI J1 A09. I just crimped a pin on this lead and plugged it into the ProEFI. Note that this is Digital Input 4 when setting up the Flex fuel input settings in the ProEFI.

I mounted the flex fuel sensor under the intake manifold and plumbed it into the return line from the FPR to the stock return hardline.

 

[Josh S]

resvered

 

[ovey1]

Great write-up keep up the good work. I need to hook my fuel pumps up like yours.

 

[Dj6ta]

Awesome job! Mods, make this a sticky!

 

[89tSupra]

very nice writeup

 

[NickD.]

Awsome Guide! I might use this someday, thanks.

 

[::MySTiK_[SuPRa]::]

Nice job Josh. This definitely should be stickied.

 

[Supradedupra]

Awesome!

For more reference material, here are some other "Guides" that may help anyone else who until recently, felt really in over their head after opening the box and seeing nothing but a pin out sheet:

http://proefiforum.forumakers.com/t118-94-supra-auto-map-fps-uego-install

http://proefiforum.forumakers.com/t...t119-94-supra-auto-can-gauge-iboost-switch-boost-controller-trac-wiring-install

I'll probably make one as well just for the sake of more information, and the fact that my build might be a little different.

 

[Josh S]

Supradedupra, thanks for posting the links to Dave's guides, he has done a great job and helped me track down one problem I found after my install was finished.

When I installed my ProEFI there were no guides out there so I spent a lot of timing going over the Supra wiring diagrams and planning everything out from the pin-out sheet included from ProEFI. Hopefully these guides will help anyone who wants to tackle the install themselves.

 

[Cursed]

"Note, you must also cut the light green/red wire at the ABS/TRAC relay box on the passenger side of the engine bay. I do not have a picture of this. "

Please clarify why this needs to be done?

Adam

 

[Josh S]

"Note, you must also cut the light green/red wire at the ABS/TRAC relay box on the passenger side of the engine bay. I do not have a picture of this. "

Please clarify why this needs to be done?

Adam

This is something I overlooked initially and Dave's guide helped me figure out the issue. Basically if you don't do this the "TRAC Off" light will be forced on even if the ProEFI has the traction control on. Based on looking at the wiring diagram I think it is possible to simply remove the TRAC relay from that box, but I didn't try that so I can't be sure.

 

[Cursed]

This is something I overlooked initially and Dave's guide helped me figure out the issue. Basically if you don't do this the "TRAC Off" light will be forced on even if the ProEFI has the traction control on. Based on looking at the wiring diagram I think it is possible to simply remove the TRAC relay from that box, but I didn't try that so I can't be sure.

Thanks J, I went back and looked over Dave's posts on proefi.com and found what you mentioned. Cutting this wire resolved an issue I had been working on for 5 months where that light was not working!

Adam

 

[bg_bls]

Thanks for taking the time to post this up. It should make things much easier for me when I switch to PROEFI :rockon:

 

[SupraFTW]

On your trac wiring, did you run a return signal wire to the Proefi or just the two signal wires for front and rear?

 

[Josh S]

On your trac wiring, did you run a return signal wire to the Proefi or just the two signal wires for front and rear?

I just ran one wire for the front and one for the rear. However if I had to do it over again I would use shielded cable grounded at each end just to minimize the chance of the signals picking up noise. That being said I seem to be getting nice clean speed inputs to the ProEFI with the unshielded wires.

 

[SupraFTW]

Thanks for the quick reply. I'm in the middle of wiring it up myself.

Did anyone say not to run the return signal? Dave's write-up shows a return wire being used and ProEFI's pinout has an input for the speed sensor return (Pin J1 A32). I guess if yours works without it, then I don't need it either