Rear Left Wheel Sensor Fault - Check Mounting - JLG 1250AJP Troubleshooting Manual

Note Pretest Instructions
1.257.8 Install a low pressure gauge
(1000 psi) on main manifold
MP1 and adjust to 450 psi ±
10% on load sense
1.257.9 Swap valve section with the
one on the other side of
machine.

1.258 REAR LEFT WHEEL SENSOR FAULT - CHECK MOUNTING

Flash Code: 8-6
Rear left wheel sensor fault - check mounting. The control system detected the rear left steer angle sensor value was below
the mechanical minimum angle while the wheel was detected as blocked. The sensor may be mounted improperly or the
sensor may be faulty.
Note Pretest Instructions
1.258.1 Check faults
1.258.2 Disconnect rear left steer
sensor [X238]
1.258.3
1.258.4 Extend axles. Go to ANA-
LYZER ⇒ DIAGNOSTICS ⇒
DRIVE ⇒ L REAR WHEEL
ANGL
1.258.5 Swap rear left wheel sensor
[X238] with a sensor that
doesn't have a fault.
1.258.6
1.258.7 Disconnect rear left wheel
sensor [X238]
1.258.8 Disconnect rear left wheel
sensor [X238] and chassis
module J3 [X231]
1.258.9 Disconnect rear left wheel
sensor [X238] and rear left
steer passthru - 4 pos.
[X237]
3128411
SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Test
Is condition clear?
Does condition follow valve section to other
side of machine?
Test
Is the fault REAR LEFT WHEEL BLOCKED
present?
Do the connectors have any loose, damaged,
corroded contacts or moisture inside?
Is the rear left wheel sensor [X238] in tact and
properly installed? This includes checking that
the sensor pin will turn the sensor and the sen-
sor is properly tensioned.
Monitor value while operating steering. Steer
fully to the left, then fully to the right. Does the
displayed angle ever climb above ±42.11?
-OR- Does the value pause, jump or act errati-
cally?
Check faults. Does the new location now have
a wheel sensor fault?
Calibrate steering. Does fault clear?
Turn on machine. Is there 5VDC between rear
left wheel sensor socket A [X238.A.soc] and
socket C [X238.C.soc]?
Is there continuity between rear left wheel sen-
sor socket B [X238.B.soc] and chassis mod-
ule J3 socket 11 [X231.11.soc]?
Is there continuity between rear left wheel sen-
sor socket B [X238.B.soc] and rear left steer
passthru pin 2 [X237.2.pin]?
1250AJP
Result Corrective Action
Yes Troubleshooting complete
No Do not remove gauges.
Go to step 1.257.9
Yes Repair/replace valve section
No Repair/replace rear left steer cylinder and/or
hoses.
Result Corrective Action
Yes Troubleshoot that first
No 1.258.2
Yes Repair as needed
No Go to step 1.258.3
Yes Go to step 1.258.4
No Reinstall and recheck
Yes Repair/replace sensor and mounting as needed
No Go to step 1.258.5
Yes Replace sensor originally at the rear left wheel.
No Go to step 1.258.6
Yes Troubleshooting complete
No Go to step 1.258.7
Yes Keep sensor disconnected.
Go to step 1.258.8.
No Go to step 1.258.10
Yes Reprogram/replace ground module
No Keep rear left wheel sensor [X238] disconnected.
Go to step 1.258.9
Yes Repair harness between rear left steer passthru
socket 2 [X238.2.soc] and chassis module J3
socket 11 [X231.11.soc]
No Repair/replace harness between rear left wheel
sensor socket B [X238.B.soc] and rear left steer
passthru pin 2 [X237.2.pin]
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