Scottybbythesea Posted September 15 Share Posted September 15 TCU/TCM DYI fix. My ‘88 AW4 would start out in 4th and not downshift. I was able to manually shift gears with the column shifter so I bought a used TCU/TCM and it fixed my problem. Out of curiousity I took my old TCM apart and discovered a single burned up resistor. I ordered a new one and soldered it in and wouldn’t ya know it, success! Just passing this along in case it might help someone else because the older TCMs are getting harder to find. https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R272J/13537194?so=88501518&content=productdetail_US Link to comment Share on other sites More sharing options...
GonzoTheGreat Posted September 16 Share Posted September 16 That’s a good clean solder job. Thanks for the info! Also a hell of a lot cheaper than a replacement TCM. Link to comment Share on other sites More sharing options...
Salvagedcircuit Posted September 16 Share Posted September 16 Awesome job! Thanks for the photos Link to comment Share on other sites More sharing options...
gogmorgo Posted September 17 Share Posted September 17 Most issues with electronics are just something simple like this. Or a cracked solder joint. Those I can deal with easily enough, usually just takes a gentle poke with a soldering iron to reflow the blob. I wish I had the time to learn more about electronic components and testing. I can guarantee you’d save thousands over a life of repairs. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now