Service Manual Owner's manual

SECTION 8 - DIAGNOSTIC TROUBLE CODES
3121222 – JLG Lift – 8-11
322 CONTACTOR DRIVER PER-
MANENTLY ON
The power modules line contactor drive
circuitry failed to de-energize when
requested. Drive, steer and lift up pre-
vented.
• 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 BATTERY The ground board detected voltage while
the brake solenoid 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
operation.
• 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 solenoid was commanded off at
power up.
• Check for continuity through this circuit. The lift up solenoid resis-
tance 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 resis-
tance 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.
335 LIFT DN SHORT TO BAT-
TERY
The ground board detected voltage while
the lift down solenoid was commanded
off.
• Check ANALYZER -> MACHINE SETUP -> ELEV PROX is set to
NOT INSTALLED
• Check for continuity through this circuit. The lift down solenoid
resistance should measure about 20 Ohms. The lift down sole-
noid is powered (PWM) by ground board J1-26, and its ground is
to ground board J1-27.
• Inspect the wiring for physical damage.
•Replace ground board.
336 LIFT DN OPEN CIRCUIT The ground board did not detect current
flow to the lift down solenoid during nor-
mal operation.
• Check for continuity through this circuit. The lift down solenoid
resistance should measure about 20 Ohms. The lift down sole-
noid is powered (PWM) by ground board J1-26, and its ground is
to ground board J1-27.
• Inspect the wiring for physical damage.
•Replace ground board.
337 STEER LEFT SHORT TO
BATTERY
The ground board detected voltage while
the steer left solenoid was commanded
off at power up.
• Check for continuity through this circuit. Steer left solenoid resis-
tance should measure about 30 Ohms. The steer left solenoid is
powered with 24V from ground board J1-21, and its ground is to
ground board J1-30, 37.
• Inspect the wiring for physical damage.
•Replace ground board.
3-2 Line Contactor Short Circuit
DTC FAULT MESSAGE DESCRIPTION CHECK