Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Overriding an Electronic Automatic Transmission

saand · 01-28-2011, 07:08 AM

Hi RFdesigner, I am an elec eng as well.
Good to see another person trying this one out. I have gotten control of my TC (Torque converter) and my gear selection.
The methods i have used are written up in the wiki if you haven't come across it yet the links are here
Torque Converter Lockup - EcoModder
Manumatic - EcoModder

my car sounds like its a bit older than yours, the ECU did throw errors however it has not caused any issues.
I now have full gear selection and TC lock up control with just switches and i highly recommend the modification if your after more control of your efficiency and driving.

When i was looking into it, other people fooled their ECU by using a representative load on the ECU lines which went to the transmission. I believe this just involved a resistor on each line which simulated the same resistance as the solenoid coil.

you could test this out just using a switch and resistor on the TC control, cut the TC control line put the resistor on the ECU side and put the switch on the transmission side so you get control. Drive around the block and see if it throws any errors or starts limping home.

01-28-2011, 07:08 AM	#2 (permalink)
saand Wiki Writer Join Date: Jul 2010 Location: Melbourne, Australia Posts: 236 bugler - '91 Mazda 626 90 day: 35.89 mpg (US) Thanks: 15 Thanked 25 Times in 22 Posts	Hi RFdesigner, I am an elec eng as well. Good to see another person trying this one out. I have gotten control of my TC (Torque converter) and my gear selection. The methods i have used are written up in the wiki if you haven't come across it yet the links are here Torque Converter Lockup - EcoModder Manumatic - EcoModder my car sounds like its a bit older than yours, the ECU did throw errors however it has not caused any issues. I now have full gear selection and TC lock up control with just switches and i highly recommend the modification if your after more control of your efficiency and driving. When i was looking into it, other people fooled their ECU by using a representative load on the ECU lines which went to the transmission. I believe this just involved a resistor on each line which simulated the same resistance as the solenoid coil. you could test this out just using a switch and resistor on the TC control, cut the TC control line put the resistor on the ECU side and put the switch on the transmission side so you get control. Drive around the block and see if it throws any errors or starts limping home.