Page 95
34-J Desel - Servce & Parts Manual
December 2021
Secton 19 - Troubleshootng
GP500 Module
The GP500 module is “the brains” of the system. It receives and processes a variety of inputs both
from the machine and the operator, then controls all the operative functions of the machine. It also
has a feature that allows the technician to access and monitor all functionality of the system, along
with a technician-friendly series of fault messages that can be accessed through the use of the
onboard EZ-Cal scan tool. Flash codes are also provided in case an EZ-Cal scan tool is not available.
Such information can be used for preventative maintenance and troubleshooting should a problem
arise. A comprehensive list of EZ-Cal accessible information can be found later in this section.
The GP500 operates on 12 volts DC and should never be probed or operated with voltage higher
than 14 volts DC.
ART_5714
GP500 Module
Diagnostic
LED
1
3
13
15
1
3
10
12
1
3
10
12
1
3
13
15
1
3
13
15
1
3
13
15
1
3
1
3
1
3
1
4
1
4
13
15
P4
P4-1
P4-2
P4-3
P4-4
P4-6
P4-7
P4-8
P4-10
P4-11
P4-13
P4-15
JIB DOWN
DRIVE FRW
DRIVE REV
JIB UP
AXLE LOCK
SWING LEFT
SWING RIGHT
BOOM UP
BOOM DOWN
BRAKE VALVE
PLATFORM SUPPLY
P5
P5-1
P5-2
P5-3
P5-5
P5-6
P5-7
P5-8
P5-10
P5-11
P5-12
P5-14
P5-15
PLATFORM ROTATE LEFT
STEER RIGHT
STEER LEFT
PUMP CONT#1 INTERLOCK
ALARM
TELE OUT
TELE IN
PLATFORM LEVEL UP
PLATFORM LEVEL DOWN
TILT LIGHT
PROPORTIONAL VALVE
PLATFORM ROTATE RIGHT
P6
P6-1
P6-2
P6-4
P6-5
P6-6
P6-7
P6-9
P6-10
P6-12
P6-13
P6-14
P6-15
OVERLOAD LIGHT
GENERATOR
START INHIBIT LIGHT
BATTERY ISOLATOR RELAY
AUX BATTERY POWER
ALTERNATOR EXCITE
CHOKE/GLOW PLUG
STARTER
IGNITION/DIESEL
HOUR METER
HIGH RPM
HORN
P7-1
P7-2
P7-3
P7-4
P7-5
P7-6
P7-7
P7-9
P7-10
P7-11
P7-12
P7-13
P7-14
VALVE SUPPLY
KEY SWITCH BASE SELECT
BOOM UP SWITCH
KEY SWITCH PLATFORM SELECT
GENERATOR RUNNING
ENGINE START SWITCH
ENGINE STOP SWITCH
AUX BATTERY POWER
BOOM DOWN SWITCH
TELE OUT SWITCH
TELE IN SWITCH
ENG OIL PRESSURE SWITCH
ENG TEMPERATURE SWITCH
P7
P8-2
P8-3
P8-4
P8-5
P8-6
P8-7
P8-8
P8-9
P8-13
P8-14
P8-15
UPPER BOOM ANGLE TRANSDUCER
UPPER BOOM ANGLE TRANSDUCER 2
CABLE EXTENSION TRANSDUCER
CABLE EXTENSION TRANSDUCER 2
UPPER BOOM ANGLE TRANSDUCER 2
PRESSURE TRANSDUCER
ENGINE TEMP SENSOR
AMMETER
GROUND TO MODULE
GROUND TO MODULE
GROUND TO MODULE
P8
P15-1
P15-2
P15-3
P15-4
P15-5
P15-6
P15-7
P15-8
P15-9
SWING LEFT SWITCH
SWING RIGHT SWITCH
PLATFORM LEVEL UP SWITCH
GLOW SWITCH
IDLE ENABLE SWITCH
PLATFORM LEVEL DOWN SWITCH
PLATFORM ROTATE LEFT SWITCH
HIGH SPEED ENABLE SWITCH
PLATFORM ROTATE RIGHT SWITCH
P15
P14
P14-1
P14-2
P14-4
JIB UP SWITCH
JIB DOWN SWITCH
BOOM EXTEND SWITCH
P2
P2-1
P2-2
P2-3
CAN1H
CAN1L
GND
P1
P1-1
P1-2
P1-3
CAN1H
CAN1L
GND
P12
P12-1
P12-2
P12-3
CAN2H
CAN2L
GND
P9
P9-1
P9-2
P9-3
P9-4
B+ SUPPLY
RX
TX
GND
EZ CAL
DIAGNOSTICS