- Turn the ignition switch ON (II).
- Measure voltage between the PGM-FI main relay 1 4P connector terminal No. 2 and body ground.
Is there battery voltage?
YES - Go to step 56.
NO - Repair open in the wire between the No. 6 ECU (ECM) (15A) fuse and the PGM-FI main relay 1. 
- Turn the ignition switch OFF.
- Check for continuity between the PGM-FI main relay 1 4P connector terminal No. 1 and ECM connector terminals A2 and A3 individually.
Is there continuity?
YES - Replace the PGM-FI main relay 1.
NO - Repair open in the wire between the PGM-FI main relay 1 and the ECM (A2, A3).
- Measure voltage between body ground and ECM connector terminals A4, A5, A23 and A24 individually.
ECM CONNECTOR A (31P)
Wire side of female terminals
Is there less than 1.0 V?
YES - Repair open in the wire(s) between that had more than 1.0 V between G101 and the ECM (A4, A5, A23, A24).
NO - Go to step 59.
- Measure voltage between body ground and ECM connector terminal A21.
ECM CONNECTOR A (31P)
Wire side of female terminals
Is there about 5 V?
YES - Go to step 67.
NO - Go to step 60.