Blam Sensor Supply Out Of Range Low; Boom Angle Sensor #1 Communications Fault - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING

1.49 BLAM SENSOR SUPPLY OUT OF RANGE LOW

Flash Code: 9-9
BLAM sensor supply out of range low. BLAM sensor power supply voltage for the boom angle sensors is below the expected
range. A power cycle is required.
Note Pretest Instructions
1.49.1 Cycle power
1.49.2 Disconnect BLAM J3
[X088]. Turn on machine.
1.49.3 Disconnect BLAM J3
[X088]. Disconnect battery (
- ) terminal [X117]

1.50 BOOM ANGLE SENSOR #1 COMMUNICATIONS FAULT

Flash Code: 8-4
Boom angle sensor #1 communications fault. The control system lost serial communications with tower angle sensor #1
(Right).
Note Pretest Instructions
1.50.1
1.50.2
1.50.3 Turn on machine. Discon-
nect right tower boom angle
sensor connector [X099]
1.50.4 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 Section 6. Mul-
timeter Basics on Pg. 319
for details on backprobing.)
1.50.5 Turn on machine. Discon-
nect 12-pin Deutsch con-
nector [X058].
1-54
Test
Does fault clear?
Is there between 5.5 V and 4.5 volts measured
between the following points on
BLAM J3:
pin 1 [X088.8.pin] to pin 3 [X088.3.pin];
pin 4 [X088.4.pin] to pin 6 [X088.6.pin];
pin 7 [X088.7.pin] to pin 9 [X088.9.pin];
pin 10 [X088.10.pin] to pin 12 [X088.12.pin]?
Is there a short between the battery ( - ) termi-
nal [X117] and any of the following: chassis
module J3, socket 1 [X088.1.soc], socket 4
[X088.4.soc], socket 7 [X088.7.soc], or
socket 10 [X088.10.soc]?
Test
Are there loose or damaged connections at the
right tower boom angle sensor connector
[X099]?
Does the fault log show BOOM ANGLE SEN-
SOR #2 COMMUNICATIONS FAULT before a
power cycle?
Is there 12VDC on right tower boom angle sen-
sor connector socket 1 [X099.1.soc] and
socket 3 [X099.3.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]?
1250AJP
Result Corrective Action
Yes Troubleshooting complete
No Go to step 1.49.2
Yes Go to step 1.49.3
No Replace BLAM
Yes Troubleshoot BLAM J3 [X088] harness wire with
short
No Reprogram/replace BLAM
Result Corrective Action
Yes Repair any loose or damaged wires or connec-
tors
No Go to step 1.50.2
Yes Go to step 1.50.4
No Go to step 1.50.3
Yes Leave connector disconnected. Go to step
1.50.8.
No Go to step 1.50.4
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 1.50.5.
Yes Go to step 1.50.11
No Leave 12-pin Deutsch connector [X058] dicon-
nected. Go to step 1.50.6.
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