NEW UPDATED DESIGN GCU Blink Code Tests
A
B
A
Green LED Light
NEW UPDATED DESIGN GCU Blink Codes for Software Stored Codes - Activated when key is turned to ON
position.
Failure Condition
Speed Error
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)
62 690 05 Rev. E
B
Yellow LED Light
Possible Causes
KohlerEngines.com
Speed control issues can also be diagnosed utilizing
on-board Blink Code diagnostic lights equipped in GCU.
These GCUs store blink codes/trouble codes, that can
be quickly diagnosed using blink code charts.
Response
Response
Ground to kill,
close throttle plate
Ground to kill,
1 second
close throttle plate
delay
Ground to kill,
0.5
close throttle plate
seconds
Governor System
LED Diagnostics
Time
Yellow LED Green LED
BLINKS
ON
BLINKS
BLINKS
ON
ON
OFF
ON
73