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GCU-3000 21
SECTION 7 : TROUBLESHOOTING
Connected to battery, but
GCU does not respond
• Check battery, If voltage is < 9 Vdc
• Check the battery positive and negative
connection for reversed connection
• Test DC connection terminal for bad contact
• Check DC input protection fuse (F4)
• None of the above
• Change battery
• Correct error
• Correct error
• Change fuse
• Change another GCU-3000
GCU responds normally, but
the starter motor does not
respond
• Check battery, If voltage is < 9 Vdc
• Check the starter motor circuit for incorrect
connection
• Test start output terminal for bad contact
• Check if the starter motor assisting relay
comply with the battery requirement
• Check starter motor assisting relay
• Change battery
• Correct error
• Correct error
• Change starter motor assisting
relay
Start motor responds
normally, but fails to start,
panel appears start failure
• Check fuel level
• Check stop settings
• Check governor and actuator
• Check if fuel solenoid for jamming
• Add fuel
• Reset to correct stop settings
• Change governor or actuator
• Change fuel solenoid
Starter motor disengages
immediately during cranking,
can not start successfully
• Check battery, If voltage is < 9 Vdc
• Check Starter motor circuit
• Check for poor contact from the start signal
terminal
• Check oil pressure sensor
• Change battery
• Correct error
• Correct error
• Change suitable oil pressure
switch or cancel oil pressure
switch to confirm start
starts successfully, but starter
motor does not disengage
• Check AC voltage (5 500 Vac)
• Check AC input protection fuse (F1, F2, F3)
• Check for AC open circuit
• Check oil pressure switch operation
• Check starter motor operation
• Change AVR
• Change fuse
• Correct error
• Change to suitable oil
pressure switch
• Change starter motor
When starter does not
respond, GCU executes stop
• Check oil pressure switch for NO, NC setting
• Check oil pressure switch operation
• Check oil pressure sensor operation
• Correct internal setting
• Change oil pressure switch
• Change GCU exclusive oil
pressure sensor
• Check Preheat timer if equal to “0 Zero”
• Check for preheat wiring open circuit
• Correct internal setting
• Correct error
• Check MPU operation
• Check open circuit in wiring
• Check MPU signal strength if below +/- 2V
• Change MPU
• Correct error
• Change MPU
Remote start signal initiated
under AUTO, but does not
start
• Check if energize to start and energize to
stop setting
• Check remote start input signal
• Check for starter motor open circuit
• Check start signal output
• Correct internal setting
• Correct error
• Correct error
• Correct error
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