DLC Circuit Troubleshooting
  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 ECM connector No. 2 terminals No. 2, No. 4, or No. 6 and body ground (G502).■
  1. Remove the under-hood fuse/relay box.
  1. Test PGM-FI main relay 1.
Is PGM-FI main relay 1 OK?
YES -
Go to Step 53 .
NO -
Replace the under-hood fuse/relay box. ■