JLG 1850SJ Service And Maintenance Manual page 585

SECTION 6 - JLG CONTROL SYSTEM
Table 6-13. Diagnostic Trouble Code Chart
Flash
DTC Sequence Fault Message Fault Description Check
Code
84152 8 4 TOWER LENGTH SENSOR 2 FAULTY There are three ways (a, b, c) that these Check Hardware, Wiring
faults can be set:
(a)
If the length sensor voltage changes more
than 0.0168 volts within 40 milliseconds a
counter for the respective length sensor
shall be incremented to aid service in diag-
nosing bad sensor performance. The coun-
ter below shall be incremented anytime the
description above is met. It is cleared/reset
by a power cycle
TwrLenSnsr(1/
2)FaultCounter_PowerCycle > 30
(b)
The counter below shall be incremented
every time TwrLenSnsr(1/
2)FaultCounter_PowerCycle (described
above) reached its threshold. This value is
stored in EEPROM in order to track the his-
tory of the issue. (A successful Boom Sensor
Calibration will reset this counter – this is
reflected in the boom sensor calibration
document)
TwrLenSnsr(1/2)FaultCounter_EEPROM >
3
(c)
The fault counter below shall be incre-
mented every time the trigger condition
described in section (a) is observed during
certain steps during Boom Sensor Calibra-
tion (please see that document section for
further details)
TwrLenSnsr(1/2)FaultCounter_BmSnsrCal
> 20
If (a) or (b) or (c) are met (fault triggered)
the machine will be put into Electrical
Retrieval
Fault, once triggered, is maintained within
a given key-cycle
Machine will be trapped in transport
3121619 6-153