Tower Lift Apu Valve Short To Ground; Tower Lift Apu Valve Stuck Open; Tower Lift Enable Open Circuit; Tower Lift Enable Short To Battery - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.309 TOWER LIFT APU VALVE SHORT TO GROUND

Flash Code: 3-3
Tower lift auxiliary power unit pilot valve short to ground. The tower lift pilot valve output [X002.12] is shorted to ground. See
1.378 COMMON STG PROCEDURE on Pg. 175.

1.310 TOWER LIFT APU VALVE STUCK OPEN

Flash Code: 3-3
Tower lift auxiliary power unit pilot valve stuck open. This fault is detected at the end of a tower lift down command. The con-
troller keeps the tower lift enable valve [X080] on with the tower lift PVG valve [X066] off and looks for tower angle sensor
movement. If movement is detected, the tower lift pilot valve [X075] is likely stuck open.

1.311 TOWER LIFT ENABLE OPEN CIRCUIT

Flash Code: 3-3
Tower lift enable open circuit. The tower lift enable output [X002.33] is open. See 1.377 COMMON STB OR OC PROCE-
DURE on Pg. 174.

1.312 TOWER LIFT ENABLE SHORT TO BATTERY

Flash Code: 3-3
Tower lift enable short to battery. The tower lift enable output [X002.33] is shorted to battery. See 1.377 COMMON STB OR
OC PROCEDURE on Pg. 174.

1.313 TOWER LIFT ENABLE SHORT TO GROUND

Flash Code: 3-3
Tower lift enable short to ground. The tower lift enable output [X002.33] is shorted to ground. See 1.378 COMMON STG
PROCEDURE on Pg. 175.

1.314 TOWER LIFT ENABLE STUCK OPEN

Flash Code: 3-3
Tower lift enable stuck open. Fault is detected when a tower lift up is engaged. The controller keeps the tower lift enable
valve [X080] off and engages the tower lift PVG valve [X066] and looks for tower angle sensor movement. If movement is
detected, the tower lift enable valve is likely stuck open.

1.315 TOWER LIFT PVG VALVE COMMAND IMPROPER

Flash Code: 4-5
Tower lift PVG valve command improper. Tower lift PVG valve received an incorrect instruction from the CAN bus. This could
be due to a CAN bus problem or a ground module problem.
Note Pretest Instructions
1.315.1 Check faults
1.315.2
1-148
Test
Is EXCESSIVE CAN BUS COMMUNICATION
ERRORS present?
Cycle power. Does problem clear?
1250AJP
Result Corrective Action
Yes Troubleshoot that fault first
No Go to step 1.315.2
Yes Troubleshooting complete
No Reprogram/replace ground module
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