its like this. My lude has a hunting idle so i go to check for codes in the ECU, i do the jumper thing and the check engine comes on but doesnt go out. does this mean no codes are in the ecu or is there a prob with the ecu. see, i thought if no codes were in the ecu it would do the one flash hello thing then nothing for no codes. someone let me know. thanx

 

unplug the negative wire on the Battery, then plug it back in after a minute or so, if the light doesnt shut off theni dotn know what to tell you.

 

Constant led = Code 0 Ecu malfunction..

Sorry man but it sounds like your ecu is bad...