JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 84151 — TOWER LENGTH SENSOR 1 FAULTY - REPLACE/RECALIBRATE SENSOR
Message on the display: TOWER LENGTH SENSOR 1 FAULTY - REPLACE/RECALIBRATE SENSOR
Code 84151 occurs in machines: JLG 1250AJP.
blocking fault
There are three ways (a, b, c) that these faults can be set: (a) If the length sensor voltage changes more than 1.44 inches within 40 milliseconds a counter for the respective length sensor shall be incremented to aid service in diagnosing bad sensor performance. The counter below shall be incremented anytime the description above is met. It is cleared/reset by a power cycle TwrLenSnsr(1/2)FaultCounter PowerCycle > _ 20 (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 history of the issue. (A successful Boom Sensor Calibration will reset this counter - t
Description from the JLG service manual, in the original wording.
Possible causes
The manual does not list the causes for this code: the service technician establishes them during diagnosis of the machine.
Checks from the manual
- Check wiring and hardware Replace sensor and recalibrate.
What service does
A qualified service technician reads the code with the manufacturer's diagnostic tools, finds the cause, clears the code and carries out a function test.
Source: JLG Service and Maintenance Manuals: 600AJ (3121201), 800AJ (3120858), 460SJ, 860SJ, 1250AJP (3122581800), M450AJ (3121829), M600JP (3121711), Diagnostic Trouble Codes tables.
The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.
Does code 84151 not go away?
RK Rental services JLG lifts at our workshop or on site at the customer's premises (construction site, factory, warehouse). We read the code, remove the cause and select the parts by serial number.
Neighbouring JLG codes
- 46136REAR LEFT BRAKE SUPPLY VOLTAGE - OUT OF RANGE LOW
- 46137REAR RIGHT BRAKE SUPPLY VOLTAGE - OUT OF RANGE LOW
- 66111CANBUS FAILURE - CONNECTIVITY MODULE
- 84152TOWER LENGTH SENSOR 2FAULTY - REPLACE/RECALIBRATE SENSOR
- 84153BOOM LENGTH SENSOR 1 FAULTY - REPLACE/RECALIBRATE SENSOR
- 84154BOOM LENGTH SENSOR 2 FAULTY - REPLACE/RECALIBRATE SENSOR