JLG 1200SJP Service Maintenance Manual page 220

SECTION 3 - CHASSIS & TURNTABLE
SFC 513- A/D Loss
Key On - Engine Running
System Data Mode
Check all power and
Clear System Fault
ground circuits to ECM
Yes
Does SFC 513 reset
with engine idling?
Yes
Replace ECM with known
Are all circuits ok?
good part and retest
No
No
Fault is intermittent
Repair wiring to
ECM and retest
3-174 – JLG Lift – 3121142