Dtc 1652- tps1 loss of communications, Dtc 1652- tps1 loss of communications -209, Diagnostic aids – JLG 450A_AJ Series II Service Manual User Manual
Page 259
SECTION 3 - CHASSIS & TURNTABLE
3121180
– JLG Lift –
3-209
DTC 1652- TPS1 Loss of Communications
• Throttle Actuator (with serial/digital position feedback).
• Check Condition- Key On, Engine Running and/or
Stopped.
• Fault Condition- ECM is expecting to receive throttle
position information from the throttle actuator and is
not.
• Corrective Action(s)- Illuminate MIL, sound audible
warning or illuminate secondary warning lamp. Shut-
down engine.
• Non-emissions related fault.
For a throttle actuator with serial/digital position feedback,
the ECM receives a constant data stream from the throttle
actuator. If communication is absent or interrupted, the
ECM can no longer control the throttle position.
This fault will set if the key is on, the throttle actuator is
receiving power, and the ECM is not receiving digital infor-
mation from the actuator.
Diagnostic Aids
• Verify throttle actuator 5V supply voltage is present at
the actuator.
• Check for a all four TPS feedback wires for short cir-
cuits.
• Check TPS SER+ and TPS SER- wire routing with
respect to noise sources (ignition coils, spark plug coil
wires, etc.) and shield if necessary.
E
le
c
tro
n
ic
T
h
ro
ttle
A
c
tu
a
to
r w
/Se
ria
l
P
o
s
itio
n
F
e
e
db
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