Governor System
53
19 690 01 Rev. --
KohlerEngines.com
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)
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
OFF
Summary of Contents for Command Pro ECV850
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