JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 4368 — ALL FUNCTIONS PREVENTED - ENGINE POWER REDUCTION SEVERE
Message on the display: ALL FUNCTIONS PREVENTED - ENGINE POWER REDUCTION SEVERE
Code 4368 occurs in machines: JLG 1250AJP.
blocking fault
The ECM is derating the engine, machine will lock out engine powered functions but allow APU. ECM will clear fault once issue is no longer detected. For Tier 4 Final: The Engine Control Module is reporting that a SCR system trouble code has been ignored too long. Triggered by SPN:FMI 524191:14 For Stage 5: The Engine Control Module is reporting an engine aftertreatement trouble code that has been ignored to long.
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
- Refer to Engine Manufacture's Take Action for Repair procedure in Diagnostic Trouble Code list using the SPN:FMI provided to diagnose and repair. Run Regeneration if required.
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 4368 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.