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

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.334 TOWER TELE ENABLE STUCK OPEN

Flash Code: 3-3
Tower telescope enable stuck open. This fault is detected when a tower lift up is engaged. The controller keeps the tower
tele enable valve [X081] off and engages the tower tele PVG valve [X067] and looks for tower length sensor movement. If
movement is detected, the tower tele enable valve is likely stuck open.

1.335 TOWER TELESCOPE APU OPEN CIRCUIT

Flash Code: 3-3
Tower telescope auxiliary power unit pilot valve open circuit. The tower telescope pilot valve output [X002.32] is open. See
1.377 COMMON STB OR OC PROCEDURE on Pg. 174.

1.336 TOWER TELESCOPE APU SHORT TO BATTERY

Flash Code: 3-3
Tower telescope auxiliary power unit pilot valve short to battery. The tower telescope pilot valve output [X002.32] is shorted
to battery. See 1.377 COMMON STB OR OC PROCEDURE on Pg. 174.

1.337 TOWER TELESCOPE APU SHORT TO GROUND

Flash Code: 3-3
Tower telescope auxiliary power unit pilot valve short to ground. The tower telescope pilot valve output [X002.32] is shorted
to ground. See 1.378 COMMON STG PROCEDURE on Pg. 175.

1.338 TOWER TELESCOPE PVG VALVE COMMAND IMPROPER

Flash Code: 4-5
Tower telescope PVG valve command improper. Tower telescope 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
1.338.1 Check faults
1.338.2

1.339 TOWER TELESCOPE PVG VALVE COMMUNICATIONS

Flash Code: 4-5
Tower telescope PVG valve communications. The tower telescope PVG valve is required to send it's status message every
100mS. If the status message from the PVG valve is not received within 500mS then this fault is issued.
Note Pretest Instructions
1.339.1 Check faults
1.339.2 Disconnect tower tele PVG -
4 pos. [X067]. Turn on
machine.
1.339.3 Disconnect tower tele PVG -
4 pos. [X067] and ground
module J2 [X002]
1-154
Test
Is EXCESSIVE CAN BUS COMMUNICATION
ERRORS present?
Cycle power. Does problem clear?
Test
Is EXCESSIVE CAN BUS COMMUNICATION
ERRORS present?
Measure voltage between tower tele PVG con-
nector socket 2 [X067.2.soc] and socket 3
[X067.3.soc]. Is it about 12 VDC?
Is there continuity between tower tele PVG - 4
pos. socket 2 [X067.2.soc] and ground mod-
ule J1 socket? [X001.?.soc]?
1250AJP
Result Corrective Action
Yes Troubleshoot that fault first
No Go to step 1.338.2
Yes Troubleshooting complete
No Reprogram/replace ground module
Result Corrective Action
Yes Troubleshoot that fault first
No Go to step 1.339.2
Yes Go to step 1.339.4
No Go to step 1.339.3
Yes Repair harness between tower tele PVG - 4 pos.
[X067] and battery ground
No Repair harness between tower tele PVG - 4 pos.
[X067] and ground module J1
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