JLG 1200SJP Service Maintenance Manual page 197

• Key On, Engine Running
• System Mode= "Running"
Operate engine at condition
that set fault based on fault
snapshot
Does DTC 336 reset ?
No
Intermittent fault
Faulty wireharness
(twist circuit)
Increase the air gap between
sensor and trigger wheel
Repair wireharness
3121142
Yes
Is crank sensor a VR/
magnetic pick-up?
Yes
No
Is wiring between sensor
and ECM properly twisted?
Yes
Yes
Does fault only occur at
high operating speeds?
No
Check wiring and electrical connections
between crankshaft position sensor and ECM
No
Is the wiring OK?
Yes
• Poor system ground
• Bad crankshaft position sensor
• Bad ECM
No
Check wiring and electrical connections
between crankshaft position sensor and ECM
Is the wiring OK?
• Poor system ground
• Bad crankshaft position sensor
• Bad ECM
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE
No
Repair wireharness
Yes
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