Boom Angle Sensor #2 Communications Fault - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Note Pretest Instructions
1.50.14 Disconnect the #1 right side
tower boom angle sensor
[X099] and the BLAM con-
nector J2 [X087]

1.51 BOOM ANGLE SENSOR #2 COMMUNICATIONS FAULT

Flash Code: 8-4
Boom angle sensor #2 communications fault. The control system lost serial communications with tower angle sensor #2
(Left).
Note Pretest Instructions
1.51.1
1.51.2
1.51.3 Turn on machine. Discon-
nect left tower boom angle
sensor #2 connector
[X100]
1.51.4 Turn on machine. Back-
probe between the 12-pin
ground bus connector
[X098] and 12-pin V-Batt+
bus connector [X097] by the
BLAM. (See Backprobing
on Pg. 319 for details on
backprobing.)
1.51.5 Turn on machine. Discon-
nect 12-pin Deutsch con-
nector [X058].
1.51.6 Disconnect 12-pin Deutsch
connector [X058] and
Power Down Relay [X011]
1.51.7 Disconnect 12-pin Deutsch
connector [X058] and
ground control module J3
[X008]
1-56
Test
Is there continuity between #1 right side
tower boom angle sensor socket 2
[X099.2.soc] and the BLAM connector J2
socket 8 [X087.8.soc]? Also, are the contacts
free from damage?
Test
Are there loose or damaged connections at the
left tower boom angle sensor connector
[X100]?
Does the fault log show BOOM ANGLE SEN-
SOR #1 COMMUNICATIONS FAULT before a
power cycle?
Is there 12VDC on left tower boom angle sen-
sor #2 connector socket 1 [X100.1.soc] and
socket 3 [X100.3.soc]?
Is there 12VDC between 12-pin V-Batt+ bus
connector[X097] and 12-pin ground bus con-
nector [X098]?
Is there 12VDC between 12-pin Deutsch
socket 2 [X058.2soc] and socket 5
[X058.5.soc]?
Is there a short between 12-pin Deutsch con-
nector socket 2 [X058.2.soc] and Power
Down Relay socket 87 [X011.87.soc]?
Is there a short between 12-pin Deutsch con-
nector socket 2 [X058.2.soc] and ground
control module J3 socket 3 [X008.3.soc]?
1250AJP
Result Corrective Action
Yes Reprogram/replace the BLAM
No Repair/replace harness and/or contacts as
needed
Result Corrective Action
Yes Repair any loose or damaged wires or connec-
tors
No Go to step 1.51.2
Yes Go to step 1.51.4
No Go to step 1.51.3
Yes Leave connector disconnected. Go to step
1.51.8.
No Go to step 1.51.4
Yes Repair/replace 12-pin V-Batt+ bus connector
[X097] and/or 12-pin ground bus connector
[X098].
No Leave machine on. Go to step 1.51.5.
Yes Go to step 1.51.11
No Leave 12-pin Deutsch connector [X058] dicon-
nected. Go to step 1.51.6.
Yes Leave 12-pin Deutsch connector [X058] discon-
nected. Go to step 1.51.7.
No Repair/Replace harness between 12-pin Deutsch
connector [X058], including the bus connector
itself and the Power Down Relay [X011]
Yes Ensure both contacts of the 12-pin Deutsch con-
nector socket 2 [X058.2] are seated properly in
the connector bodies and that there is continuity
between all pins.
No Repair/replace harness and or connectors
between 12-pin Deutsch connector [X058] and
ground control module J3 socket 3 [X008.3]
3128411