I have a 1990 C4 (6-speed coupe, if it matters), ECM 1227727, and I'm trying to connect to the ECM with the ALDLDroid Android app via an ALDL Bluetooth connector. I've tried several different ADX files I've found online, but I have issues with each one. I try connecting both key on, engine off and with the engine running, yet I rarely can connect. I'm either getting incorrect checksum or incorrect response length errors.
Every now and then I get lucky and connect, but more often than not I am not able to do so. Even when I connect, sometimes some of the sensor data displayed is incorrect by a large enough margin to indicate an error of some sort.
I'm trying to narrow down the problem, but first I want to make sure I am using the proper ADX file. Does anyone have an ADX they know works with a 1227727 ECM in a '90 C4?