4-42 FI SYSTEM
“C23” TO SENSOR CIRCUIT MALFUNCTION
INSPECTION
DETECTED CONDITION POSSIBLE CAUSE
No TO sensor signal for more than 4 seconds,
after ignition switch turns ON.
Sensor voltage high.
• TO sensor circuit open or short.
• TO sensor malfunction.
• ECM malfunction.
( )
0.2 V Sensor voltage
4.6 V
<
without the above range.
Ω
• Remove the seat. (
:
6-4)
1
2
Ye s
Ye s
No
No
Replace the TO sensor
with a new one.
Loose or poor contacts on the ECM
coupler.
Open or short circuit in the Br/W
wire or B/Br wire.
Replace the TO sensor with a new
one.
Red, Br/W or B/Br wire open or shorted to ground, or poor
0
,
a
or
X
connection. (
:
4-22)
If wire and connection are OK, intermittent trouble or faulty ECM.
Recheck each terminal and wire harness for open circuit and
poor connection. (
:
4-5)
Turn the ignition switch OFF.
Check the TO sensor coupler for loose or poor contacts.
If OK, then measure the TO sensor resistance.
Disconnect the TO sensor coupler.
Measure the resistance between Red and B/Br wire
terminals.
;
TO sensor resistance: 19.1 – 19.7 kΩ (Red – B/Br)
z
09900-25008: Multi circuit tester
t
Tester knob indication: Resistance (Ω)
Connect the TO sensor coupler.
Insert the copper wires to the lead wire coupler.
Turn the ignition switch ON.
Measure the voltage at the wire side coupler between
Br/W and B/Br wires.
;
TO sensor voltage: 0.4 – 1.4 V (Br/W – B/Br)
;
TO sensor voltage: 3.7 – 4.4 V (Br/W – B/Br)
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
-
)
Replace the ECM with a new one,
and inspect it again.
Also, measure the voltage when leaning of the motorcycle.
Dismount the TO sensor from its bracket and measure the
voltage when it is leaned more than 65˚, left and right, from
the horizontal level.
V
1
2
ECM coupler
10
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