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FI
SYSTEM
DIAGNOSIS
"C15" ECT SENSOR CIRCUIT MALFUNCTION
DETECTED CONDITION
POSSIBLE CAUSE
Output voltage low or high • ECT sensor circuit open or short.
0.15
;;;;;;
Sensor voltage < 4.85 V
• ECT sensor malfunction.
(without the above range.)
• ECM malfunction.
INSPECTION
Step
1
1) Lift and support the fuel tank with its prop stay.
(c::::r5-5)
2) Turn the ignition switch OFF.
3) Check the ECT sensor coupler for loose or poor contacts.
If OK, then measure the ECT sensor voltage at the wire side
coupler.
4) Disconnect the coupler and turn the ignition switch ON.
5) Measure the voltage between S/SI wire terminal and ground.
6) If OK, then measure the voltage between S/SI wire terminal
and S/Sr wire terminal.
_ ETC
sensor
voltage:
4.5 - 5.5 V
(CB
BIBI - 8
Ground)
(CB
BIBI - 8
B/Br)
.RiOt!
09900-25008:
Multi
circuit
tester
set
~
Tester
knob
indication:
Voltage
(=-=-=)
Is the voltage OK?
YES
Go to Step 2
• Loose or poor contacts on the ECM coupler.
NO • Open or short circuit in the S/SI wire or S/Sr
wire.
B/Br
~/
I
BIBI