P0603

DETECTING CONDITION AND POSSIBLE CAUSE

DTC CONFIRMATION PROCEDURE
1. Turn ignition switch OFF.
2. Clear DTC with ignition switch ON.
3. Turn ignition switch OFF.
4. Start engine and run it at idle it possible.
5. Check pending DTC in "ON BOARD TEST" or "PENDING DTC" mode and DTC in "DTC" mode.

INSPECTION
Substitute a known-good ECM and recheck.