JLG 3246ES Service Manual - Manual (Page 163)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
3121166 – JLG Lift – 6-11
314 AUXILIARY RELAY - OPEN
CIRCUIT The auxiliary relay did not close
when energized. • Check the auxiliary relay coil and associated wiring to
J1-13 and J1-32.
• No voltage on J1-28.
• HEALTH (Status LED) - ON
3-2 Line Contactor Short Circuit
DTC FAULT MESSAGE DESCRIPTION CHECK
321 LINE CONTACTOR
MISWIRED ON OR
WELDED Battery voltage was present at
the power module B+ terminal
at power up. Drive, steer and lift
up prevented. • Check wiring of contactor.
• Check resistance between the studs of the contactor
while disconnected from the machine.
• Check contactor main contact wiring to battery (+)
terminal and power module terminal B+.
• Check continuity between contactor connector pin 1
and ground board socket J1-19.
• Check continuity between contactor connector pin 2
and power module 12 position connector terminal 8.
• Measure voltage between power model B+ and B- ter-
minals. If 24V is present, replace line contactor.
• Replace power module.
322 CONTACTOR DRIVER
PERMANENTLY ON The power modules line contac-
tor drive circuitry failed to de-
energize when requested. Drive,
steer and lift up prevented. • Check continuity between contactor connector pin 1
and ground board socket J1-19.
• Check continuity between contactor connector pin 2
and power module 12 position connector terminal 8.
• Replace power module.
3-3 Ground Output Driver
DTC FAULT MESSAGE DESCRIPTION CHECK
331 BRAKE SHORT TO BAT-
TERY The ground board detected
voltage while the brake sole-
noid was commanded off. • Ensure ANALYZER -> MACHINE SETUP -> ELEV PROX is
set to NOT INSTALLED.
332 BRAKE OPEN CIRCUIT The ground board did not
detect current flow to the brake
solenoid during normal opera-
tion. • Ensure ANALYZER -> MACHINE SETUP -> ELEV PROX is
set to NOT INSTALLED.
333 LIFT UP SHORT TO BAT-
TERY The ground board detected
voltage while the lift up sole-
noid was commanded off at
power up. • Check for continuity through this circuit. The lift up
solenoid resistance should measure about 30 Ohms.
The lift up solenoid is powered with 24V from ground
board J1-25, and its ground is to ground board J1-30,
37.
• Inspect the wiring for physical damage.
• Replace ground board.
334 LIFT UP OPEN CIRCUIT The ground board did not
detect current flow to the lift up
solenoid during power up. • Check for continuity through this circuit. The lift up
solenoid resistance should measure about 30 Ohms.
The lift up solenoid is powered with 24V from ground
board J1-25, and its ground is to ground board J1-30,
37.
• Inspect the wiring for physical damage.
• Replace ground board.
3-1 Line Contactor Open Circuit
DTC FAULT MESSAGE DESCRIPTION CHECK