Am I correct? There's four connectors on the ECM--A, B, C, and D.
When they're ALL unplugged, and you connect power to C16 and ground to D1, the fuse doesn't blow.
What happens if you connect the entire "C" connector, and the ground to D1? What happens if you connect power to C16, and the entire "D" connector? The entire "B" connector?
Wild Guess with no evidence: It'll be fine until you plug in the "A" connector. (But I've been wrong before.)
When they're ALL unplugged, and you connect power to C16 and ground to D1, the fuse doesn't blow.
What happens if you connect the entire "C" connector, and the ground to D1? What happens if you connect power to C16, and the entire "D" connector? The entire "B" connector?
Wild Guess with no evidence: It'll be fine until you plug in the "A" connector. (But I've been wrong before.)