JLG 3248RS/10RS Service Manual - Manual (Page 119)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
3121273 – JLG Lift – 6-9
3-2 Line Contactor Short Circuit
DTC FAULT MESSAGE DESCRIPTION CHECK
321 LINE CONTACTOR
MISWIRED ON OR WELDED The Line contactor is off, but the System
Module is being energized. • Check wiring of contactor.
• Check resistance between the studs of the contactor while dis-
connected 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 J1-13.
• Check continuity between contactor connector pin 2 and ground
module J1-32.
• Measure voltage between power model B+ and B- terminals. If
24V is present, replace line contactor.
• Replace power module.
• HEALTH (Status LED) - ON
326 AUXILIARY RELAY - SHORT
TO BATTERY The Auxiliary Relay has not been ener-
gized by the System Module, but J1-28
is energized. • The Auxiliary Relay's contacts or coil may be mis-wired
• There is a wire harness issue that allows +B to reach J1-28.
This situation will cause the batteries to discharge while the vehi-
cle is turned off.
• Alternately, the Auxiliary Relay is faulty, replace Auxiliary Relay.
• HEALTH (Status LED) - ON
3-3 Ground Output Driver
DTC FAULT MESSAGE DESCRIPTION CHECK
333 LIFT UP VALVE - SHORT TO
BATTERY Voltage from an external source was
detected on the Lift Up Solenoid (J2-17
NUV). • 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 J2-1, and its ground is to
ground board J2-17.
• Inspect the wiring for physical damage.
• Replace ground board.
• HEALTH (Status LED) - ON
334 LIFT UP VALVE - OPEN CIR-
CUIT Current flow to the Lift Up Solenoid was
not detected (J2-17 NUV). • 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, and its ground is to ground
board.
• Inspect the wiring for physical damage.
• Replace ground board.
• HEALTH (Status LED) - ON
335 LIFT DOWN VALVE - SHORT
TO BATTERY The power module detected voltage
while the lift down solenoid was com-
manded off. (J2-2 PDV or J2-16 NDV) • 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 J2-2, and its ground is
to ground board J2-16.
• Inspect the wiring for physical damage.
• Replace ground board.
• HEALTH (Status LED) - ON