Pvg Valve Enable Short To Battery; Pvg Valve Enable Short To Ground; Rear Left Wheel Blocked - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.255 PVG VALVE ENABLE SHORT TO BATTERY

Flash Code: 3-3
PVG valve enable short to battery. The PVG valve enable output [X002.31] is shorted to battery. See 1.377 COMMON STB
OR OC PROCEDURE on Pg. 174.

1.256 PVG VALVE ENABLE SHORT TO GROUND

Flash Code: 3-3
PVG valve enable short to ground. The PVG valve enable output [X002.31] is shorted to ground. See 1.378 COMMON STG
PROCEDURE on Pg. 175.

1.257 REAR LEFT WHEEL BLOCKED

Flash Code: 8-6
Rear left wheel blocked. The control system is unable to steer the rear left wheel. Steering was commanded for at least 1.3
seconds without sensing an appropriate change in angle from the rear left steer angle sensor. This could be caused by a
mechanical blockage, a hydraulic problem, or a faulty angle sensor.
Note Pretest Instructions
1.257.1
1.257.2
1.257.3 Note that glow plug's large
power draw can aggravate
existing problems with
power distribution wiring
and low battery power. Fre-
quent starting can drain bat-
tery when preheating.
1.257.4 Watch the angle sensor
value on ANALYZER ⇒
ACCESS LEVEL 1 ⇒ CALI-
BRATIONS ⇒ STEER ⇒
CALIBRATE? Press Enter to
view raw value REAR LT
STEER VALUE = XX Do not
press Enter.
1.257.5
1.257.6
1.257.7 Ensure proper pressure with
ANALYZER ⇒ ACCESS
LEVEL 1 ⇒ CALIBRATIONS
⇒ STEER ⇒ REAR LT
STEER VALUE = XX.
1-126
Test
Is the rear left wheel kept from moving?
Check the fault log for primary faults, LT REAR
STEER LT STB OR OC, LT REAR STEER LT
STG, LT REAR STEER RT STB OR OC, LT REAR
STEER RT STG, or any steer angle sensor fault
When engine coolant temperature is below
140°F (60°C), air temperature is below 59°F
(15°C), and battery voltage is less than 11VDC
before starting, does fault mainly occur within
30 seconds after starting engine?
Steer completely left, pause, then completely
right, pause. Does the value continuously and
smoothly change while steering?
If the wheel will not steer in either direction,
check the steer valve for a stuck spool.
Are there any bent, damaged, or seized steer-
ing components?
Install a 3000 psi gauge or higher on Rear
Steer Axle valve port MS1 and MS2 Adjust
steer pressures on Rear Steer/Axle valve.
Adjust relief next to port to 2600 psi ± 10% on
gauge on port MS1. Adjust relief next to port to
2000 psi ± 10% on port MS2. ESC out of cali-
brate mode. Cycle E-stop switch to clear failed
calibration message. Is condition clear?
1250AJP
Result Corrective Action
Yes Free the wheel from any obstructions
No Go to step 1.257.2
Yes If a primary fault is found, troubleshoot it before
this fault
No Go to step 1.257.3
Yes Examine the battery condition and contacts
within the Chassis power distribution wiring.
Repair/replace as needed.
No Go to step 1.257.4
Yes ESC out of calibrate mode. Cycle E-stop switch to
clear failed calibration message.
Go to step 1.257.5
No Repair/Replace the sensor and calibrate.
Yes Repair/Replace the valve
No Go to step 1.257.6
Yes Repair/Replace the component
No Go to step 1.257.7
Yes Troubleshooting complete
No Do not remove gauges.
Go to step 1.257.8
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