Diagnostic aids – JLG 450A_AJ Series II Service Manual User Manual
Page 167
SECTION 3 - CHASSIS & TURNTABLE
3121290
– JLG Lift –
3-127
DTC 219- RPM Higher Than Max Allowed Governed
Speed
• Max Govern Speed Override- Crankshaft Position Sensor
• Check Condition-Engine Running.
• Fault Condition-Engine speed greater than the max gover-
nor override speed as defined in the diagnostic calibration.
• Corrective Action(s): Sound audible warning or illuminate
secondary warning lamp, reduce throttle to limit speed.
Recommend closed loop and adaptive learn fueling correc-
tion remains active during fault.
• Non-emissions related fault
This fault sets anytime engine RPM exceeds limit set in diag-
nostic calibration for latch time or more. This speed overrides
any higher max governor speeds programmed by the user.
This fault is designed to help prevent engine or equipment
damage.
Throttle lowers to govern engine to speed set in diagnostic
calibration.
DTC 219- RPM Higher Than Max Allowed Governed Speed
(continued).
Diagnostic Aids
NOTE: If any other DTCs are present, diagnose those first.
• Ensure no programmed governor speeds exceed limit set
in diagnostic calibration for Max Gov Override Speed
• Check mechanical operation of the throttle actuator
E
le
c
tro
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ic
T
h
r
o
ttle
A
c
tu
a
to
r w
/S
e
ria
l
P
o
s
itio
n
F
e
e
d
b
a
c
k
2
1
6
1
3
1
2
1
5
V
_e
x
t
V
s
=
+
5
V
DC
5
V
_
rtn
T
P
S
1
T
P
S
S
ER
+
+
-M
o
to
r
D
B
W-
D
B
W+
E
C
M
H
-B
rid
g
e
1
9
T
P
S
S
ER
-
S
e
ria
l x
m
itte
r
Electronic Throttle
Actuator w/Serial
Position Feedback
2
16
13
12
1
5V_ext
Vs=+5 VDC
5V_rtn
TPS1
TPS SER +
+
-
Motor
DBW-
DBW+
ECM
H-Bridge
19
TPS SER -
Serial
xmitter