PDF associated: /PT 77-0010.pdf

---

MS 7121 PT 77 0010 CARDONE Corrects GM ECM Surface Mount Problem G M Electronic Control Computers with surface mount technology Original part numbers are 16156647 1227165 1227303 1227727 1227730 1227748 1227749 1228253 1228321 1228547 1228706 and 16149396 Engine misfire hesitation and intermittent check engine light and stalling The original conformal coating applied by G M swelled causing movement of the electronic components and cracking of critical solder joints In 1994 a new process was introduced into production by CARDONE The original conformal coating is removed then the components on the printed circuit board are resoldered and tested Finally a new formula conformal coating is applied to seal the circuit board to complete the process CARDONE Electronic Control Computer part numbers with the updated process are 77 6647 77 7165 77 7303 77 7727 77 7730 77 7748 77 7749 77 8253 77 8321 77 8547 77 8706 and 77 9396 Application Problem Cause Solution Note