JLG 15/20MSP Service Manual - Manual (Page 138)

SECTION 6 - TROUBLESHOOTING
6-18 – JLG Lift – 3121231
Obstruction Sensor System - Detection
Check For These Obvious Conditions First:
• Look for an obstruction under platform, remove obstruction.
• Check for any external damage to sensor(s) or wiring harness.
• Are the O.S.S. side shield tubes secure to platform frame and not loose or protruding into the sensor detection area?
• Are the isolation bushings in place and undamaged on both the O.S.S. Module and each of the detection sensors?
• Are the detection sensor mounting screws properly tightened (not over torqued) so not to damage the isolation bushings?
Also check that none of the sensor mounting screws are bent, thereby touching the inside of the sensor mounting holes.
• Are any of the "Do not pressure wash" decals loose and protruding into the sensor detection area?
Battery Voltage Low - Warning Level 3 - Three (3) LED/LCDs lit
• 3 LEDs/BARS Flashing with an audible beep.
• Machine will Operate - No Control Functions are Locked Out.
When batteries are drained to Warning Level 3, charge batteries until a level of four (4) LEDs-(Platform) or BARS (Ground
Control Module), or more before operating. Failure to do so, will eventually result in a fault Code 38 - Battery Voltage Low -
Warning Level 2.
NOTE: If battery is not charging properly, see Battery/Battery Charger Servicing - Section 3 of this Manual.
Table 6-6. Obstruction Sensor System - Detection
STEP ACTION SPEC YES NO
1. Perform Daily Pre-Start Inspection to test each transducer sensor.
Did all sensors pass test? — Go to Step 2 Replace Sensor
2. Disconnect the OSS Control Module connection to the Platform Junction
Box mounted on the mast platform header section above the OSS Control
Module. Does the Ground Control Module now show a Fault Code 5? — Go to Step 3 Replace Ground
Control Module
3. Reconnect the OSS Control Module connection to the Platform Junction
Box. Check for original fault condition. — Replace
OSS System
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