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