Diagnostic aids – JLG 450A_AJ Series II Service Manual User Manual
Page 222
SECTION 3 - CHASSIS & TURNTABLE
3-172
– JLG Lift –
3121180
DTC 219- RPM Higher Than Max Allowed
Governed Speed
• Max Govern Speed Override- Crankshaft Position Sen-
sor
• Check Condition-Engine Running.
• Fault Condition-Engine speed greater than the max
governor override speed as defined in the diagnostic
calibration.
• Corrective Action(s): Sound audible warning or illumi-
nate secondary warning lamp, reduce throttle to limit
speed. Recommend closed loop and adaptive learn
fueling correction remains active during fault.
• Non-emissions related fault
This fault sets anytime engine RPM exceeds limit set in
diagnostic 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 diagnos-
tic 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
n
ic
T
h
ro
ttle
A
c
tua
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
D
C
5
V
_
rtn
T
P
S
1
T
P
S
S
E
R
+
+
-M
o
to
r
D
B
W
-
D
B
W
+
E
C
M
H
-B
rid
g
e
1
9
T
P
S
S
E
R
-
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