Kohler CH680 Service Manual

Governor System
4724 690 06 Rev. P KohlerEngines.com
SECOND DESIGN GCU Blink Codes
Failure Condition Possible Causes Response
Response
Time
LED Diagnostics
Yellow LED Green LED
Overspeed (Over
4500 RPM for 0.5
seconds sustained)
External noise on ignition input Ground to kill,
close carb throttle
plate
0.2
seconds
Flashing On
Frozen carb throttle plate
DLA failure
Mechanical bindage
Out of RPM range
(Unable to maintain
an average RPM of
+/- 100 RPM of
setpoint for 10
seconds)
Frozen carb throttle plate Normal operation 10 seconds Solid on or
solid off
Flashing
DLA failure
Mechanical bindage
Bad fuel
Bad ignition system
Missing ignition
pulse detected
RFI interference Normal operation N/A Pulse Off Solid on or
solid off
Poor lead connection
Bad ignition module
Ignition module
signal missing on
startup
Ignition leads disconnected DLA will remain at
start point
N/A Off On
Watchdog Interrupt RFI interference Ground to kill,
close carb throttle
plate
N/A Flashing Flashing
Overtemp
Software bug
Lightning
Excessive Battery
Voltage
(> 18v for 0.5
seconds)
Ground to kill,
close carb throttle
plate
0.5
seconds
Flashing Off
Good condition Engine is operating normally Normal operation 10 seconds
of good
engine run
time
On Solid on or
solid off

Kohler CH680 Specifications

General

Displacement	674 cc
Compression Ratio	8.5:1
Fuel System	Carburetor
Ignition System	Electronic
Cooling System	Air-cooled
Starter	Electric
Engine Type	4-cycle, overhead valve (OHV)
Oil Capacity	1.9 L (2.0 U.S. qt)
Lubrication	Full Pressure
Power	22 hp (16.4 kW) at 3600 rpm