Normally open switch normally closed switch – JLG 450A_AJ Series II Service Manual User Manual
Page 172
SECTION 3 - CHASSIS & TURNTABLE
3-132
– JLG Lift –
3121290
Normally Open Switch
Normally Closed Switch
• Key-On, Engine Off
• System Mode= “Stopped”
Does DTC 524
reset ?
Intermittent Problem
No
• Key Off
• Disconnect harness from Oil Pressure switch
• Check continuity through switch to ground.
Yes
Is switch closed?
• 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
• Key-On, Engine Off
• System Mode= “Stopped”
Does DTC 524
reset ?
Intermittent Problem
No
• Key Off
• Disconnect harness from Oil Pressure switch
• Check continuity through switch to ground.
Yes
Is switch open?
• 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