Finally got back to this thing Voltage dropped all power and grounds have 83 mv on the vpwer pins 37 and 57 11 mv on pins 29 ground ,20 and 49 ground 2 mv on grounds 40 and 60 . 0 volts on the O2 signal ECT shows .718 vollts at 175 deg f iat shows 1.13 volts a... Login to read more.