Yamaha T135SE Service Manual page 338

TROUBLESHOOTING
The coolant temperature warning indicator
light starts to display the self-diagnosis
sequence.
Check:
1. throttle position sensor
2. thermo sensor
NOTE:
9Before troubleshooting, remove the following
part(s):
1. side cowlings (left and right)
2. front cowling
3. center panel (lower)
9Troubleshoot with the following special tool(s).
Pocket tester
90890-03112
1. Throttle position sensor
CIRCUIT DIAGRAM
Br
B /L
G/R
(BLACK)
W
9 W
B
R
B/L L Y
L L
Y Y
e
G/R
G/R
B/L
t
G/R B/L
G/W
B/L
P
0 C.D.I. unit
e Throttle position sensor
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Yamaha T135 Service Manual
P B L
G/W
W O W/Y Y
(BLACK)
O O
B
0
Br Br
r
W /Y L
Br Br
(BLACK)
W Y / L
W Y /
L
y
L L
B
B
B
B/L Br B
Br
SELF-DIAGNOSIS
1. Wire harness
9Check the wire harness for continuity.
Refer to "CIRCUIT DIAGRAM".
9Is the wire harness OK?
YES
2. Throttle position sensor
9Check the throttle position sensor for conti-
nuity.
Refer to "CHECKING AND ADJUSTING THE
THROTTLE POSITION SENSOR" in chapter
6.
9Is the throttle position sensor OK?
YES
Replace the C.D.I
unit.
w
8-46
ELEC
NO
Repair or replace the
wire harness.
NO
Replace the throttle
position sensor.