Kohler Command CH620 Service Manual page 44

Governor System
SECOND DESIGN GCU Blink Codes
Failure Condition Possible Causes
Overspeed (Over External noise on ignition input
4500 RPM for 0.5
Frozen carb throttle plate
seconds sustained)
DLA failure
Mechanical bindage
Out of RPM range Frozen carb throttle plate
(Unable to maintain
DLA failure
an average RPM of
+/- 100 RPM of
Mechanical bindage
setpoint for 10
Bad fuel
seconds)
Bad ignition system
Missing ignition RFI interference
pulse detected
Poor lead connection
Bad ignition module
Ignition module Ignition leads disconnected
signal missing on
startup
Watchdog Interrupt RFI interference
Overtemp
Software bug
Lightning
Excessive Battery
Voltage
(> 18v for 0.5
seconds)
Good condition Engine is operating normally
44
Response
Ground to kill,
close carb throttle
plate
Normal operation
Normal operation
DLA will remain at
start point
Ground to kill,
close carb throttle
plate
Ground to kill,
close carb throttle
plate
Normal operation
KohlerEngines.com
LED Diagnostics
Response
Time Yellow LED
0.2 Flashing
seconds
10 seconds Solid on or
solid off
N/A Pulse Off
N/A Off
N/A Flashing
0.5 Flashing
seconds
10 seconds On
of good
engine run
time
24 690 06 Rev. O
Green LED
On
Flashing
Solid on or
solid off
On
Flashing
Off
Solid on or
solid off