DTC P1623: ECM Power Source Circuit Unexpected Voltage Turn the ignition switch ON (II). Clear the DTC with the HDS. Turn the ignition switch OFF, and wait 1 minute. Turn the ignition switch ON (II). Check for Temporary DTCs or DTCs with the HDS. Is DTC P1536 or P1623 indicated?
YES | - | Go to Step 6 .
NO | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 and the ECM.■
Turn the ignition switch OFF. Disconnect PGM-FI main relay 1. Check PGM-FI main relay 1. Is PGM-FI main relay 1 OK?
YES | - | Go to Step 9 .
NO | - | Replace PGM-FI main relay 1, then go to Step 13 .
Disconnect ECM connector No. 2 (58P). Check for continuity between ECM connector No. 2 terminal No. 19 and body ground. Is there continuity?
YES | - | Repair short in the wire between PGM-FI main relay 1 and ECM connector No. 2 terminal No. 19, then go to Step 12 .
NO | - | Go to Step 11 .