I know this is a old post but would like to fix the comments if someone else needs help when reading flash codes on komatsu if when you read ten flashes then that is zero so the first code is 0350 primary ignition circuit problem l would look at ignition coils for Miss fire the second code is0500 speed sensor input problem l would check wiring to sensor as sensor is very low in trans and l seen wrapping pull wiring out of connected hope this helps