12-34 FI SYSTEM DIAGNOSIS
8) Insert the needle-pointed probes to the lead wire coupler.
9) Check the continuity between Yellow wire
C
and terminal
5
.
10)Also, check the continuity between R/Bl wire
A
and terminal
C
.
TP sensor lead wire continuity: Continuity (
)
09900-25008: Multi circuit tester set
09900-25009: Needle-pointed probe set
Tester knob indication: Continuity test (
)
Is the continuity OK?
Step 2
1) Connect the ECM coupler and TP sensor coupler.
2) Connect a 12 volts battery by using the battery lead wire to
the service coupler. (
12-19)
3) Insert the needle-pointed probes to the lead wire coupler.
4) Measure the TP sensor output voltage at the coupler
(between
+
Yellow and
-
B/Br) by turning the throttle grip.
TP sensor output voltage
Throttle valve is closed: Approx. 0.6 V
Throttle valve is opened: Approx. 3.8 V
09900-25008: Multi circuit tester set
09900-25009: Needle-pointed probe set
36890-28H00: Battery lead wire (option)
Tester knob indication: Voltage (
)
Is the voltage OK?
YES
Go to Step 1. (
12-31)
NO
R/Bl wire or Yellow wire open, or Yellow wire
shorted to ground.
ECM coupler (Harness side)
1
2
V
YES
• Yellow, R/Bl or B/Br wire open or shorted to
ground, or poor
5
,
C
or
N
connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO
• Short circuit in the Yellow wire.
• If check result is not satisfactory, replace TP
sensor with a new one.
ECM coupler (Harness side)
2
