Service Manual
February 2022
Diagnostics
86
GRC
™
Part No. 1314708GT
Type "UXXX" Faults
DTC
Number
Message on
GCON LCD
Description
Possible Causes
Failure Mode
U001:
U001:SWITCHFAULT
GCON MAIN FTN EN
Short circuit of the GCON main function
enable switch at system startup.
• Short circuit of the GCON main function enable
switch.
• GCON ECM.
All GCON functions
inhibited.
U002:
U002:SWITCHFAULT
GCON PLAT UP
Short circuit of the GCON up directional
switch at system startup.
• Short circuit of the GCON up directional switch.
• GCON ECM.
All GCON functions
inhibited except
platform down.
U003:
U003:SWITCHFAULT
GCON PLAT DOWN
Short circuit of the GCON down directional
switch at system startup.
• Short circuit of the GCON down directional
switch.
• GCON ECM.
All GCON functions
inhibited except
platform up.
U004:
U004:SWITCHFAULT
GCON LCD UP
Short circuit of the GCON LCD scroll up
switch at system startup.
• Short circuit of the GCON LCD scroll up switch.
• GCON ECM.
All GCON LCD
menu functions
inhibited.
U005:
U005:SWITCHFAULT
GCON LCD DOWN
Short circuit of the GCON LCD scroll down
switch at system startup.
• Short circuit of the GCON LCD scroll down
switch.
• GCON ECM.
All GCON LCD
menu functions
inhibited.
U006:
U006:SWITCHFAULT
GCON LCD ENTER
Short circuit of the GCON LCD enter switch
at system startup.
• Short circuit of the GCON LCD enter switch.
• GCON ECM.
All GCON LCD
menu functions
inhibited.
U007:
U007:SWITCHFAULT
GCON LCD ESCAPE
Short circuit of the GCON LCD escape
switch at system startup.
• Short circuit of the GCON LCD escape switch.
• GCON ECM.
All GCON LCD
menu functions
inhibited.
U014:
U014:SWITCHFAULT
PCON DRIVE EN
Short circuit of the PCON drive enable
switch at system startup.
• Short circuit of the PCON drive enable switch.
• GCON ECM.
All PCON drive and
steer functions
inhibited.
U015:
U015:SWITCHFAULT
PCON STEER LEFT
Short circuit of the PCON steer left switch at
system startup.
• Short circuit of the PCON steer left switch.
• GCON ECM.
All PCON drive and
steer functions
inhibited.
U016:
U016:SWITCHFAULT
PCON STEER RIGHT
Short circuit of the PCON steer right switch
at system startup.
• Short circuit of the PCON steer right switch.
• GCON ECM.
All PCON drive and
steer functions
inhibited.
U017:
U017:SWITCHFAULT
PCON HORN
Short circuit of the PCON horn switch at
system startup.
• Short circuit of the PCON horn switch.
• GCON ECM.
PCON horn switch
function inhibited.
U018:
U018:SWITCHFAULT
PCON LO DRIV SPD
Short circuit of the PCON low drive speed
switch at system startup.
• Short circuit of the PCON low drive speed switch.
• GCON ECM.
The machine is
limited to low drive
speed.
U033:
U033:JSTICKFAULT
OUT OF CAL RANGE
PCON drive joystick signal is outside
acceptable calibration range at system
startup.
• PCON drive joystick is not in neutral position at
startup.
• PCON joystick.
• GCON ECM.
All PCON drive and
steer functions
inhibited.
U034:
U034:JSTICKFAULT
OUT OF RANGE:HI
Short circuit of the PCON drive joystick
signal to battery positive at system startup.
• Short circuit of the PCON drive joystick signal
circuit.
• PCON joystick.
• GCON ECM.
All PCON drive and
steer functions
inhibited.
U035:
U035:JSTICKFAULT
OUT OF RANGE:LO
Short circuit of the PCON drive joystick
signal to battery negative at system startup.
• Short circuit of the PCON drive joystick signal
circuit.
• PCON joystick.
• GCON ECM.
All PCON drive and
steer functions
inhibited.
U036:
U036:SWITCHFAULT
GCON + PCON:ON
Mis-wiring or short circuit of GCON key
switch.
• Short circuit of the PCON drive enable switch.
• GCON ECM.
All functions
inhibited.
U042:
U042:SWITCHFAULT
PCON DRIVE MODE
PCON drive mode switch stuck closed, or
depressed prior to startup.
• Drive mode switch stuck closed.
• Drive mode switch is depressed at system
startup.
• PCON ECM.
Drive functions
inhibited.
U045:
U045:SWITCHFAULT
PCON DRIVE EN
Short circuit of the PCON drive enable
switch at system startup.
• Short circuit of the PCON drive enable switch.
• PCON ECM.
• GCON ECM.
All drive and steer
functions inhibited.
U046:
U046:SWITCHFAULT
PCON LIFT MODE
PCON function enable switch stuck closed,
or depressed at system startup.
• PCON lift mode switch depressed at system
startup.
• PCON ECM.
All functions operate
except platform
up/down.
Summary of Contents for Genie GRC-12
Page 113: ...February 2022 Service Manual 101 Electrical Schematic GRC Options...
Page 115: ...February 2022 Service Manual 103 Electrical Schematic GRC from GRC11 1000 to GRC11 1078...
Page 118: ...Service Manual February 2022 106 Electrical Schematic GRC from GRC11 1000 to GRC11 1078...
Page 119: ...February 2022 Service Manual 107 Electrical Schematic GRC from GRC11 1079 to GRC14 1780...
Page 122: ...Service Manual February 2022 110 Electrical Schematic GRC from GRC11 1079 to GRC14 1780...
Page 123: ...February 2022 Service Manual 111 Electrical Schematic GRC from GRC14 1781 to GRC15 2343...
Page 126: ...Service Manual February 2022 114 Electrical Schematic GRC from GRC15 2344 to GRC16P 2481...
Page 127: ...February 2022 Service Manual 115 Electrical Schematic GRC from GRC16P 2482 to GRC16P 2562...
Page 130: ...Service Manual February 2022 118 Electrical Schematic GRC from GRC16P 2563 to GRCP 5999...
Page 131: ...February 2022 Service Manual 119 Hydraulic Schematic GRC from GRC11 1000 to GRC12 1168...
Page 135: ......