You have four wheel speed sensors one of each wheel for the ABS system.
You have one output shaft speed sensor.
You have one vehicle speed sensor, I believe.
Which one are you referring to?
Check the high and low pressures on the AC. If they are down in the thirties or 20s, you are low on refrigerant and it is a coincidence. Otherwise, ensure with the battery off that all of the ECM connectors are firmly seated. Do not force any that are not. Gently remove them and inspect for bent pins.
Also, check that any wiring you disturbed or disconnected in the area where you were working on the ECM replacement has all been reconnected and is secure. It's usually the last thing you touched and forgot about that ends up being the problem.
