Tower Telescope Pvg Valve High Voltage; Tower Telescope Pvg Valve Internal Fault - JLG 1250AJP Troubleshooting Manual

Note Pretest Instructions
1.339.4 Turn off machine. Discon-
nect tower tele PVG - 4 pos.
[X067].
1.339.5 Turn off machine. Discon-
nect tower tele PVG - 4 pos.
[X067] and BLAM J4
[X089].

1.340 TOWER TELESCOPE PVG VALVE HIGH VOLTAGE

Flash Code: 4-5
Tower telescope PVG valve high voltage. Voltage powering the tower telescope PVG valve exceeded 32 VDC. Restore
proper system voltage to clear fault.
Note Pretest Instructions
1.340.1 Ensure all off-board power
connections, such as
110VAC, are disconnected.
Ensure all on-board power
systems are turned off, such
as generators, welders, etc.
1.340.2 Turn off machine. Ensure all
off-board power connec-
tions, such as 110VAC, are
disconnected. Ensure all on-
board power systems are
turned off, such as genera-
tors, welders, etc. Turn off
machine. Disconnect tower
tele PVG valve [X067]
1.340.3 Measure voltage on the sec-
ond tower tele PVG valve
connector[X261] using a
spare harness exposing ter-
minal 2 [X261.2] and 3
[X261.3], or use insulated
alligator clips to those termi-
nals.

1.341 TOWER TELESCOPE PVG VALVE INTERNAL FAULT

Flash Code: 4-5
Tower telescope PVG valve internal fault. Hardware or software inside the tower telescope PVG valve caused an error. There
are no serviceable parts that cause this problem.
Note Pretest Instructions
1.341.1 Read faults
1.341.2
3128411
SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Test
Measure resistance between tower tele PVG
socket 1 [X067.1.soc] and socket 4
[X067.4.soc]. Is it about 60Ω?
Is there continuity between tower tele PVG
socket 1 [X067.1.soc] and BLAM J4 socket 4
[X089.4.soc]? - AND - Is there continuity
between tower tele PVG socket 4
[X067.4.soc] and BLAM J4 socket 3
[X089.3.soc]?
Test
Turn on machine and start engine. Is battery
voltage about 12 VDC? -AND- Does charging
and 12VDC electrical power generation sys-
tem appear to be working properly?
Are there any shorts between tower tele PVG
valve socket 2 [X067.2.soc] or socket 3
[X067.3.soc] and wiring for off-board power
sources such as 110VAC, or on-board power
sources such as welder or generator outputs,
etc.? Note, tower tele PVG valve socket 3
[X067.3.soc] to ground continuity is OK. Be
sure to check for intermittent problems.
Observe 12VDC system voltage at the valve
over an extended time under various operating
conditions, for example, during engine start.
See Min/Max on Pg. 319 for details. Is it per-
forming properly?
Test
Are there any 6-6 communication faults?
Cycle machine power. Keep power off at least
20 seconds. Does fault still occur?
1250AJP
Result Corrective Action
Yes Replace tower tele PVG valve [X067] actuator
No Go to step 1.339.5
Yes Replace tower tele PVG valve [X067] actuator or
see 1.46 BLAM CAN COMMUNICATIONS LOST
on Pg. 48
No Repair harness between tower tele PVG - 4 pos.
[X067] and BLAM J4 [X089]
Result Corrective Action
Yes Go to step 1.340.2
No Repair 12 VDC charging and electrical power
generation system.
Yes Repair shorts as needed
No Transient condition likely set fault. If fault keeps
occurring, go to step 1.340.3.
Yes Replace tower tele PVG valve actuator [X067]
No Repair as needed
Result Corrective Action
Yes Troubleshoot those first
No Go to step 1.341.2
Yes Replace tower tele PVG valve actuator [X067]
No Troubleshooting complete
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