
FI SYSTEM DIAGNOSIS 4-41
• Voltage
09900-25008: Multi circuit tester set
Tester knob indication: Voltage (
)
– Between V wire and ground: approx. 0 V (When ignition
switch is ON)
Is check result OK?
Step 4
TP sensor check
1) Turn the ignition switch OFF.
2) Connect the ECM couplers and TP sensor coupler.
3) Insert the needle-point probes to the lead wire coupler.
4) Turn the ignition switch ON.
5) Measure the TP sensor output voltage between the V wire
terminal
+
and B/Br wire terminal
-
with turning the throttle
grip open and close.
09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
Tester knob indication: Voltage (
)
TP sensor output voltage:
Throttle valve is closed: Approx. 1.1 V
Throttle valve is opened: Approx. 4.4 V
(
+
terminal: V –
-
terminal: B/Br)
Is check result OK?
YES
Go to Step 4.
NO
Repair or replace the V wire.
V
3
YES
Replace the ECM with a known good one, and
inspect it again.
NO
Replace the TP sensor with a new one.
(
4-91)
4
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