JLG X23J - X700AJ Service Manual - Manual (Page 286)

SECTION 3 - CHASSIS & TURNTABLE
3121448 – JLG Lift – 3-259
AUTO CHOKE
The ECM automatically controls the choke so that the user
does not have to perform this task. Since the ECM detects
the engine temperature, the choke valve position in auto-
matically adjusted to its most appropriate opening from
the time the engine stars until the engine warms up.
ENGINE PROTECTION/SELF DIAGNOSIS
FUNCTION
Should engine malfunctions occur, the engine stops or the
malfunction indicator lamp illuminates to alert the user that
a problem has occurred. Count the number of times the
indicator lamp flashes to determine the cause of the prob-
lem.
IGNITION COIL WITH INTEGRATED SPARK PLUG CAP
Voltage produced by the power coil and signals produced
by the crankshaft position (CKP) sensor are sent to the
ECM. The ECM supplies primary voltage to the ignition
coil. The ignition coil which is integrated into the spark
plug cap, creates the secondary voltage to produce a
spark at the spark plug.
This system has the following advantage over the conven-
tional ignition system:
1. Since ECM controls the ignition timing, minute
adjustments become possible, improving engine
operation stability.
2. Voltage loss at high-tension cords is minimal.
3. Inspecting for broken connections at high-tension
cords and adjusting air gap between the flywheel
and ignition coil are not needed.