1. Check for continuity between body ground and ECM connector No. 2 terminals No. 2, No. 4, and No. 6 individually.

Is there continuity?

YES | - | Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■
NO | - | Repair open in the wire between PGM-FI main relay 1 and ECM connector No. 2 terminal No. 1, No. 3 or No. 5.■