Code 51, Mem-Cal Error
Ensure all pins are fully inserted in ECM socket. If okay, replace MEM-CAL. Clear memory and recheck for Code 51. If code reappears, replace ECM.
CAUTION:
To prevent possible electrostatic discharge (static electricity) damage to ECM or MEM-CAL, DO NOT touch component leads or remove integrated circuit from carrier. See N - REMOVE/INTSTALL/OHAUL article.