Page 108
45-J Desel - Servce & Parts Manual
January 2022
Secton 19 - Troubleshootng
Interlock Messages
The following messages appear as result of perceived improper operation, machine positioning, or
other incorrect operation. Interlock messages may be the result of a part failure if the part in question
provides incorrect information to the GP400.
FUNCTIONS LOCKED - LIMIT REACHED________________ Flash Code: 2/2
Rotating platform not centered; Certain operations require centered platform Rotating platform at
extreme CW or CCW; no further rotation possible in that direction
FUNCTIONS LOCKED - TEST MODE SELECTED__________Flash Code: 2/2
Calibration in progress or internal test mode active. Cycle EMS to clear.
FUNCTIONS LOCKED - OUTRIGGERS__________________ Flash Code: 2/2
Stabilizers must be set before operation is allowed.
FUNCTIONS LOCKED - OVERLOADED__________________Flash Code: 2/2
Platform overloaded - reduce weight in platform until alarms stop (Overload option only)
FUNCTIONS LOCKED - UNDERLOADED_________________Flash Code: 2/2
Overload system detects less then normal lift cylinder pressure. Platform resting atop a fixed
object, possible pressure switch failure or not calibrated correctly.
FUNCTIONS LOCKED - TILTED________________________Flash Code: 2/2
Platform sensors indicate platform out of level; level platform or chassis until alarm stops or re-
position machine
FUNCTIONS LOCKED - AUTO PLATFORM LEVEL_________Flash Code: 2/2
Auto Platform Level operation running, wait until completed to operate other functions.
FUNCTIONS LOCKED - TOO HIGH______________________Flash Code: 2/2
Elevation sensor indicating elevation beyond 98%. Height Calibration performed incorrectly;
Angle Transducer loose or remounted incorrectly or extend proximity switch/s failure. Use EZCal
in conjunction with EZ-Cal Flow Charts to identify GP400 or GP440 for sensor’s inputs to check
sensor readings.
FUNCTIONS LOCKED - EXTERNAL SHUTDOWN__________Flash Code: 2/2
Boom not retracted or axle/s off level. Boom must be retracted to allow frame level, drive
or outrigger operation. Axles must be centered before drive is allowed when the platform is
elevated. Also, drive will be interrupted if Stabilizer pressure sensor output is below 0.2 volts
(possible sensor failure or sensor wiring issue).
CHECK DRIVE/STEER SWITCHES______________________Flash Code: 2/2
Drive joystick output without enable or during power up. Check drive joystick analog output and
steer switch digital output using the EZ-Cal.
CHECK LIFT SWITCHES______________________________Flash Code: 2/2
Lift joystick or toggle switch movement without enable or during power up. Check joystick analog
output using the EZ-Cal.
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