If i get a CEL and turn off the key, turn the ignition back on and the light is gone. it resets it's self after ignition is turned off. Pin D1 going into the ecu has a constant 12v power which i belive is ecu backup power. any help would be greatly appreciated. i think the reason my car is running like sh*t all the time is because it is constantly relearning it's own parameters. I have a 1993 honda civic Cx HB OBD1 with a D15B7 16 valve engine. thanks