Read Notes Below....
Here's a nifty box I built a few years ago. My ECU is in a waterproof box so the mode screw is impossible to reach. But there are the proper leads in the diag connector to add a switch and lights elsewhere. It was less than $20 to build IIRC. I found the schematics at V6-S12.com
Notes
- it wont' work until the engine has been running for a few minutes
- pressing/releasing the button works just like turning the screw on the ecu
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