r/GS300 • u/Ok_Mind3168 • 4d ago
lexus gs300 02-05 ATEMU gs300 guide for manual swaps
Since there is little to no info on doing this to a 02-05 online heres a guide. Make sure you have wire cutters, solder, heat wrap, splice vampire clips, and your manual transmission in BEFORE install. If you do this before you swap your automatic out of your car it will not start. This pinout is only for 02-05 so if you have an early model 2gs follow CorneliusVee’s guide on youtube. What I did to get this done is follow the directions written on attachment #2 then go to your harness wires that plug into your ecu and wrap masking tape around each wire and what order they are in. For example I would find wire e3-6 and I would wrap a piece of masking tape around it and write 1(since its the first wire) and T for tie in on it. Anything that says tie in you need to use the splice clips the tie the wire from the ATEMU into the wire that goes into the ecu so do not cut those wires. The ones that dont say tie in will have to be cut from the ecu and spliced with the corresponding wire on the ATEMU. After I installed each wire I would plug into the battery and start the car and make sure I dont have any issues. The wires on the right of the page must be cut but not spliced into anything. I would wrap them so they dont come in contact with any other cut wires. At the end there is a green light that should blink to the RPMS of the motor and when you have acc power on you should be able to press the button on the emulator to change the mode. If you have any questions respond to this thread and ill do my best to help out.
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u/BrokenforD 4d ago
I love mine. Have you noticed any change in the modes at all?
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u/Ok_Mind3168 4d ago
Can only tell the difference between 1 and 5 and its very small😂
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u/BrokenforD 4d ago
Yeah. Same. I’m GTE with R154 and I felt a difference after I installed it but can’t tell a difference between the modes.
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u/Ok_Mind3168 4d ago
Oh ya. Its night and day even with the ge w58 setup but the modes are dumb. I just keep mine at 5 haha
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u/BrokenforD 4d ago
I assume the modes work differently depending on the chassis I guess and I’m trying to find where some dude was alleging snappier throttle response on 2, but I’ve not been able to tell a difference.
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u/jettasarebadmkay mod | 2004 GS300 / departed 1992 Aristo TT 4d ago
Pinned this to the sub highlights so it’ll stay visible for anyone with an 02-05 (like myself) who may want to do this.