Kohler Command PRO EFI Series Service Manual page 74

Governor System
NEW UPDATED DESIGN GCU Blink Codes for Software Running Codes - Activated when engine is running.
Failure Condition
Running Normally
RPM Too High Mechanical bindage
RPM Too Low Mechanical bindage
Missing Pulse Faulty ECU
(Normal RPM) Faulty ECU wiring
Missing Pulse Faulty ECU
(RPM Too High) Faulty ECU wiring
Missing Pulse Faulty ECU
(RPM Too Low) Faulty ECU wiring
Sleep Mode Power at GCU with no ECU
pulses (left in run mode)
Watchdog Interrupt RFI interference
Overtemp
Software bug
Lightning
Overspeed (Over External noise on ECU input
4500 RPM for 0.5
Frozen throttle plate
seconds sustained)
DLA failure
Mechanical bindage
Excessive Battery Overcharging electrical system
Voltage (> 18v for >18 volts
0.5 seconds)
Speed Out of Intermittent/open connection at
Range-Low GCU
74
Possible Causes
KohlerEngines.com
Response
Response
None
None
None
System shutdown 30 minutes OFF
Ground to kill, N/A
close throttle plate
1 second
delay
Ground to kill, 0.5
close throttle plate seconds
LED Diagnostics
Time
Yellow LED Green LED
BLINKS BLINKS
ON BLINKS
ON BLINKS
BLINKS ON
ON ON
OFF ON
OFF
BLINKS OFF
ON OFF
OFF OFF
OFF BLINKS
62 690 05 Rev. E