2 platform controls – JLG 1230ES Service Manual User Manual
Page 139
SECTION 8 - DIAGNOSTIC TROUBLE CODES
3121222
– JLG Lift –
8-7
222
FUNCTION PROBLEM -
INDOOR / OUTDOOR PER-
MANENTLY SELECTED
The indoor / outdoor (zone A / zone B)
switch was closed during power-up in
platform mode.
• Check if the indoor/outdoor (zone A / zone B) capacity switch is
damaged, obstructed or jammed.
• Replace platform board.
223
FUNCTION PROBLEM -
DRIVE & LIFT ACTIVE
TOGETHER
The drive and lift inputs are closed simul-
taneously in platform mode.
• Check drive/lift switch for visible damage.
• Check switch continuity. There should only be continuity from the
center post to one of the outer posts at a time. Otherwise, replace
the switch.
• Check drive/lift switch signal and wiring to the platform board. Its
input (0V) is from platform board terminal J1-11. "Lift" selection
output (0V when selected) is to platform board terminal J1-9.
"Drive" selection output (0V when closed) is to platform board ter-
minal J1-10.
• Replace platform board.
224
FUNCTION PROBLEM -
STEER LEFT PERMA-
NENTLY SELECTED
The steer left switch was closed during
power-up in platform mode.
• Check if the steer left switch is obstructed or jammed.
• Check steer left switch and its wiring. The steer left switch input
(24V) is from platform board terminal J1-1, and its output (24V
when closed) is to platform board terminal J1-15.
• Replace platform board.
225
FUNCTION PROBLEM -
STEER RIGHT PERMA-
NENTLY SELECTED
The steer right switch was closed during
power-up in platform mode.
• Check if the steer right switch is obstructed or jammed.
• Check steer right switch and its wiring to the platform board. The
steer right switch input (24V) is from platform board terminal J1-
1, and its output (24V when closed) is to platform board terminal
J1-16.
• Replace platform board.
226
ACCELERATOR FAULTY -
WIPER OUT OF RANGE
The joystick signal is outside the accept-
able range of 0.50V - 4.5V, or is unstable.
• Center joystick and check to see if a power cycle will clear DTC.
• Check the joystick signal and its wiring. The joystick input (5V) is
from the platform board terminal J1-5, its output (2.5V with joy-
stick at center) to the platform board terminal J1-6, and its ground
(0V) is to the platform board terminal J1-7. Observe output signal
while slowly operating joystick.
• Replace platform board.
227
STEER SWITCHES FAULTY
The steer left and steer right inputs were
closed simultaneously.
• Check if the steer switches are damaged, obstructed or jammed.
• Check the steer switch signals and wiring to the platform board.
The steer switch input (24V) is from platform board terminal J1-1,
outputs (24V when closed) are to platform board terminals J1-15
and J1-16 (left and right).
• Replace platform board.
228
FUNCTION LOCKED OUT -
ACCELERATOR NOT CEN-
TERED
The joystick was not centered at power-
up.
• Release joystick and allow to center.
• Check if the joystick is obstructed or jammed.
• Check the joystick signal and its wiring. The joystick input (5V) is
from the platform board terminal J1-5, its output (2.5V with joy-
stick at center) to the platform board terminal J1-6, and its ground
(0V) is to the platform board terminal J1-7. Observe output signal
while slowly operating joystick.
• Replace platform board.
229
FUNCTION PROBLEM -
TRIGGER PERMANENTLY
CLOSED
The trigger switch was closed during
power-up in platform mode.
• Check if the trigger switch is obstructed or jammed.
• Check the trigger switch signal and wiring to the platform board.
The trigger input (24V) is from platform board terminal J1-1, and
its output (24V when closed) is to platform board terminal J1-8.
• Replace platform board.
2-2 Platform Controls
DTC
FAULT MESSAGE
DESCRIPTION
CHECK