Governor System
59
62 690 05 Rev. E
KohlerEngines.com
ORIGINAL DESIGN Speed Control Input
A
A
Red Wire with Yellow Tracer.
This connection is a single wire red with yellow tracer.
ORIGINAL DESIGN GCU Blink Code Tests
A
B
A
Green LED Light
B
Yellow LED Light
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.
ORIGINAL DESIGN 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)
Overcharging electrical system
>18 volts
Ground to kill,
close throttle plate
0.5
seconds
OFF
ON
