JLG 450A_AJ Series II Service Manual - Manual (Page 175)

SECTION 3 - CHASSIS & TURNTABLE
3121290 – JLG Lift – 3-135
Normally Open Switch
• Key-On, Engine On
• System Mode= “Running”
• Warm engine at idle to normal
operating temperature
• Increase RPM above limit set
in diagnostic calibration
Does DTC 524
reset ?
Intermittent Problem
No
• Key Off
• Disconnect harness from Oil Pressure switch
• Clear DTC 524
• Key On, Engine On
• System Mode= “Running”
• Operate engine et idle for at least one minute
• Increase RPM above limit set in diagnostic calibration
Yes
Does DTC 524
reset?
• Oil Pressure circuit shorted-to-ground in harness
• Faulty ECM
• Faulty Oil Pressure Switch (short circuit)
• Faulty engine oiling system (verify with
mechanical gauge)
No
Yes