DLC Circuit Troubleshooting
  1. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 3 and ECM/PCM connector terminal A6.
Is there continuity?
YES -
Test PGM-FI main relay 1. If the relay is OK, update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
NO -
Repair open in the wire between the ECM/PCM (A6) and PGM-FI main relay 1.■
  1. Turn the ignition switch to LOCK (0).