Line Contactor Open Circuit; Line Contactor Short Circuit; Open Circuit Line Contactor; Contactor Driver Permanently Off - Oshkosh JLG 1930ES Service Maintenance Manual

3-1 Line Contactor Open Circuit

DTC FAULT MESSAGE
311 OPEN CIRCUIT LINE
CONTACTOR
312 CONTACTOR DRIVER
PERMANENTLY OFF
AUXILIARY RELAY -
314
OPEN CIRCUIT

3-2 Line Contactor Short Circuit

DTC FAULT MESSAGE
321 LINE CONTACTOR
MISWIRED ON OR
WELDED
322 CONTACTOR DRIVER
PERMANENTLY ON
326 AUXILIARY RELAY
SHORT TO BATTERY
3121656
DESCRIPTION
The power modules line contac-
tor did not close when ener-
gized. Drive, steer and lift up
prevented.
The power modules line contac-
tor drive circuitry failed to ener-
gize when requested. Drive,
steer and lift up prevented.
The auxiliary relay did not close
when energized.
DESCRIPTION
Battery voltage was present at
the power module B+ terminal
at power up. Drive, steer and lift
up prevented.
The power modules line contac-
tor drive circuitry failed to de-
energize when requested. Drive,
steer and lift up prevented.
The System Module did not acti-
vate the Negative Main Contac-
tor driver, but battery voltage
was measured on the J1-28 of
the controller.
SECTION 6 - DIAGNOSTIC TROUBLE CODES
CHECK
• Check contactor main contact wiring to battery (+)
terminal and power controller terminal B+.
• Contactor solenoid resistance should measure about
52 Ohms.
• Check contactor solenoid wiring to power module 12
position connector terminal 8 and ground board ter-
minal J1-19.
• Check that power module 12 position connector ter-
minal 8 goes from 24V to near 0V while contactor
should be closing. If this happens replace contactor.
• Replace the line contactor.
• Check continuity between contactor connector pin 1
and ground board socket J1-19.
• Contactor solenoid resistance should measure about
52 Ohms.
• Check continuity between contactor connector pin 2
and power module connector socket 8.
• Replace power module.
• Check the auxiliary relay coil and associated wiring to
J1-13 and J1-32.
• No voltage on J1-28.
• HEALTH (Status LED) - ON
CHECK
• 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.
• 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.
• Check contacts and coils of auxiliary relay.
• Check if no motion interlocks
• Check voltage on J1-28.
• HEALTH (Status LED) - ON
6-11