Governor System
52 19 690 01 Rev. --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.
GCU Blink Code Tests
A
B
A Green LED Light B Yellow LED Light
GCU Blink Codes for Software Stored Codes - Activated when key is turned to ON position.
Failure Condition Possible Causes Response
Response
Time
LED Diagnostics
Yellow LED Green LED
Speed Error BLINKS ON
Watchdog Interrupt RFI interference Ground to kill,
close throttle plate
BLINKS BLINKS
Overtemp
Software bug
Lightning
Overspeed (Over
4500 RPM for 0.5
seconds sustained)
External noise on ECU input Ground to kill,
close throttle plate
1 second
delay
ON ON
Frozen throttle plate
DLA failure
Mechanical bindage
Excessive Battery
Voltage (> 18v for
0.5 seconds)
Open battery voltage on B+
24 V battery (not compatible
with system, 12 V battery only)
Ground to kill,
close throttle plate
0.5
seconds
OFF ON
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