Function Cutout Active, Boom Above Horizontal

Common Symptoms

• Platform LCD displays 6053-12 and scrolls a function cutout message
• Boom drive or steer functions stop responding at the platform controls while boom is elevated above horizontal
• Machine does not travel or has travel speed limited while boom is raised above the horizontal pivot point
• Operator can still raise or lower the boom but certain combined motions are blocked
• No audible alarm or engine fault, machine otherwise feels operational
• Ground controls may still allow some movements that platform controls restrict
• Code clears on its own once boom is brought back below horizontal and functions are re-enabled

Probable Causes (Ranked by Likelihood)

• Boom is physically above horizontal and the ADE controller is correctly enforcing the factory function cutout envelope, no fault present Very Likely
• Boom angle sensor (inclinometer or tilt sensor) is reading the boom above horizontal when it is not, due to calibration drift Likely
• Boom angle sensor connector corroded or pin backed out, feeding a false elevated-angle signal to the ADE Likely
• Boom angle sensor has failed and is sending a constant out-of-range or stuck high signal Possible
• ADE software or calibration table needs updating after a sensor replacement or boom structural repair Possible
• Boom proximity switch or limit switch for the horizontal position is stuck open or misadjusted, preventing the controller from seeing the boom return to below horizontal Possible
• Wiring harness chafing along the boom causing intermittent shorts that mimic an above-horizontal angle reading Less Likely

Step-by-Step Diagnostic Procedure

1. Step 1. Observe the boom position first. If the boom is genuinely above horizontal, this code is expected behavior. Lower the boom fully below horizontal using the platform or ground controls and confirm the code clears. If it clears, no further diagnosis is needed.

2. Step 2. If the boom is at or below horizontal and the code stays active, check the boom angle sensor location on the boom pivot or turntable. Inspect the sensor body and its harness connector for moisture, corrosion, bent pins, or loose locking tabs. Clean and reseat the connector and recheck.

3. Step 3. With the boom fully lowered, use the platform LCD or connect JLG Analyzer software via the data link at the ground controls to read the live angle sensor value. The ADE should show a boom angle near 0 degrees or a negative value when the boom is below horizontal. If it still reads a positive elevated angle with the boom down, the sensor or its wiring is the problem.

4. Step 4. Measure sensor supply voltage at the connector. Most JLG boom angle sensors expect 5 VDC supply. With the key ON and connector unplugged, measure between the supply pin and ground. Less than 4.75 VDC points to a wiring or ADE supply issue. Correct supply voltage means the sensor itself may be failed.

5. Step 5. With the connector plugged in and key ON, backprobe the signal wire and measure output voltage. Slowly raise and lower the boom by hand or with controls and confirm the voltage changes smoothly with boom movement. A stuck voltage or erratic jumpy reading confirms a failed sensor or broken signal wire.

6. Step 6. Locate the boom horizontal limit switch or proximity switch if equipped on your model. With the boom lowered, confirm the switch closes or the proximity target aligns within the manufacturer spec gap (typically 3-5 mm for inductive proximity switches). Adjust the switch bracket if needed.

7. Step 7. If sensor and wiring check out, connect JLG Analyzer software via the data link at the ground controls and run the boom angle sensor calibration routine. Recalibrate per the model-specific service manual procedure. Incorrect calibration after a sensor swap will keep this code active even with a new sensor.

8. Step 8. If the code persists after sensor replacement and calibration, the fault may be inside the ADE or TCON controller. At this point the repair requires advanced controller diagnostics. Contact a JLG-authorized service shop.

Frequently Asked Questions