JLG 1200SJP Service Maintenance Manual page 201

Normally Closed Switch
• Key-On, Engine On
• System Mode= "Running"
• Warm engine at idle to normal
operating temperature
• Increase RPM above limit set
in diagnostic calibration
Yes
Does DTC 524
reset ?
No
Intermittent Problem
3121142
• Key Off
• Disconnect harness from Oil Pressure switch
• Jumper Oil Pressure signal wire to ground
• 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
Does DTC 524
reset?
No
• Faulty Oil Pressure Switch (open circuit)
• Faulty engine oiling system (verify with
mechanical gauge)
• Faulty connection at sensor
• Faulty ECM
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE
• Disconnect wireharness header from ECM
• Carefully remove yellow lock from header
at device output terminal
• CAREFULLY check resistance between
Oil Pressure signal at ECM header and
Yes
signal at sensor.
INSERT probe or object into terminals
as this will cause the terminal to
spread and may no longer make
contact with ECM pin. Spread pins will
void warranty! Probe on the side of
terminal.
Yes
Does DMM indicate a
resistance < 5.0 ohms?
• Faulty harness
NOTE: DO NOT
No
(open circuit)
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