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