JLG 1200SJP Service Maintenance Manual page 187

·K ey O n, E ngine R unning
·S ystem M ode = "R unning"
D oes D S T display an E C T
voltage less the lim it
defined in calibration?
· Interm ittent P roblem
3121142
· K ey O ff
Y es
· D isconnect E C T sensor from harness
· K ey O n, E ngine O ff
· S ystem M ode = "S topped"
No
· S ensor signal circuit shorted to ground,
check w ire harness for ground short
· F aulty E C M
D oes D S T display E C T
voltage of 4.9 V D C or
greater?
No
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE
Yes
· F aulty E C T
S ensor
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