Line Contactor Open Circuit; Line Contactor Short Circuit; Model Changed - Hydraulics Suspended - Cycle Ems; 2510 Drive Prevented - Brakes Not Releasing - JLG 1930ES Service Maintenance Manual

2-5 Function Prevented
DTC FAULT MESSAGE
259 MODEL CHANGED -
HYDRAULICS SUSPENDED -
CYCLE EMS
2510 DRIVE PREVENTED -
BRAKES NOT RELEASING
2511 ELEV ANGLE SENSOR
FAULTY - NOT MOUNTED
2512 ELEV ANGLE SENSOR NOT
DETECTING CHANGE

3-1 Line Contactor Open Circuit

DTC FAULT MESSAGE
311 OPEN CIRCUIT LINE CON-
TACTOR
312 CONTACTOR DRIVER PER-
MANENTLY OFF

3-2 Line Contactor Short Circuit

DTC FAULT MESSAGE
321 LINE CONTACTOR MIS-
WIRED ON OR WELDED
3121166
DESCRIPTION
The model selection has been changed. • Check ANALYZER -> MACHINE SETUP -> MODEL NUMBER.
While driving on a level surface, armature
current was > 150A for five seconds.
Brakes assumed to not be releasing prop-
erly.
The input voltage from the elevation
angle sensor indicates the elevation
angle sensor is not mounted.
The input voltage from the elevation
angle sensor did not change while vehicle
was lifting up.
DESCRIPTION
The power modules line contactor did not
close when energized. Drive, steer and lift
up prevented.
The power modules line contactor drive
circuitry failed to energize when
requested. Drive, steer and lift up pre-
vented.
DESCRIPTION
Battery voltage was present at the power
module B+ terminal at power up. Drive,
steer and lift up prevented.
– JLG Lift –
SECTION 6 - DIAGNOSTIC TROUBLE CODES
CHECK
• Replace ground board.
• Ensure vehicle is not stuck on something preventing movement.
• Check / repair drive motor wiring, brakes or mechanical issues.
• Check that the elevation angle sensor is securely mounted.
• Check that the elevation angle sensor mechanisms are intact.
• Replace elevation angle sensor.
• Check that the elevation angle sensor is securely mounted.
• Check elevation angle sensor is not jammed or obstructed.
• If there are any other elevation angle sensor, joystick, or lift up
faults, troubleshoot them before continuing.
• Replace elevation angle sensor.
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 terminal J1-19.
• Check that power module 12 position connector terminal 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
• 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 J1-19.
• Check continuity between contactor connector pin 2 and power
module 12 position connector terminal 8.
• Measure voltage between power model B+ and B- terminals. If
24V is present, replace line contactor.
• Replace power module.
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