JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 684 — FUNCTIONS LOCKED OUT - CONNECTIVITY INTERLOCK
Message on the display: FUNCTIONS LOCKED OUT - CONNECTIVITY INTERLOCK
Code 684 occurs in machines: JLG 1250AJP.
blocking fault
• DriveState = PREVENTED • LiftUpState = PREVENTED • LiftDownState = CREEP
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
- DTC 66111 is active OR a FUNCTIONAL INTERLOCK is received and REMOVAL INTERLOCK is set to MACHINE LOCKOUT
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 684 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
- 681REMOTE CONTRACT MANAGEMENT OVERRIDE - ALL FUNCTIONS IN CREEP
- 682FUNCTIONS IN CREEP - CONNECTIVITY INTERLOCK
- 683FUNCTIONS IN CREEP AND RESTRICTED TO TRANSPORT - CONNECTIVITY INTERLOCK
- 685ALL FUNCTIONS LOCKED OUT - CONNECTIVITY INTERLOCK
- 686ENGINE START PREVENTED - CONNECTIVITY INTERLOCK
- 772STALLED TRACTION MOTOR OR POWER WIRING ERROR