Komatsu · CA731
Engine Speed Sensor Signal Phase Failure
What this code means
Phase failure of the engine speed sensor signal.
Applies to: PC200-8 excavator (engine controller).
Need the part?
If diagnosis points to a failed sensor, solenoid, controller or harness part, send us the code (CA731), machine model and serial number — we quote genuine and OEM replacement parts for export.
Ask for the replacement part on WhatsAppSource: ProCarManuals – Komatsu Fault/Error Codes list (manual library). Single published source — confirm against the manual for your exact model before ordering parts. Compiled 2026-10-30. No manufacturer affiliation.