1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 397Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 397

Quality of the image is intentionally reduced!

DIAGNOSTICS
J1-10 J2-10 J1-24 J1-3

When the system is running on the ignition module or in crank mode, there is no voltage on CKT 424 and the ignition module grounds CKT 423 The ECM