FI SYSTEM/ CVT SYSTEM 6-33
“C15” ECT SENSOR CIRCUIT MALFUNCTION
INSPECTION
DETECTED CONDITION POSSIBLE CAUSE
Output voltage low or high. • ECT sensor circuit open or short.
• ECT sensor malfunction.
• ECM malfunction.
()
0.15 V Sensor voltage 4.85 V<
without the above range.
1
V
1
2
• Remove the maintenance lid. (
:
9-13)
1
2
Ye s
Ye s
No
No
Turn the ignition switch OFF.
Measure the ECT sensor resistance.
;
ECT sensor voltage: 4.5 – 5.5 V
+
B/Bl –
-
Ground
+
B/Bl –
-
B/Br
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
-
)
( )
Loose or poor contacts on
the ECM coupler.
Open or short circuit in the
B/Bl wire or B/Br wire.
;
ECT sensor resistance:
Approx. 2.45 kΩ at 20 ˚C (68 ˚F) (Terminal – Terminal)
z
09900-25008: Multi circuit tester
t
Tester knob indication: Resistance (Ω)
Replace the ECT sensor
with a new one.
Replace the ECM with a new
one, and inspect it again.
Turn the ignition switch OFF.
Check the ECT sensor coupler for loose or poor contacts.
If OK, then measure the ECT sensor voltage at the wire
side coupler.
Disconnect the coupler and turn the ignition switch ON.
Measure the voltage between B/Bl wire terminal and
ground.
If OK, then measure the voltage between B/Bl wire termi-
nal and B/Br wire terminal.
Refer to page 8-13 for details.
B/Bl or B/Br wire open or shorted to ground, or poor
k
or
n
connection.
If wire and connection are OK, intermittent trouble or faulty
ECM.
Recheck each terminal and wire harness for open circuit
and poor connection.
Engine Coolant
Tem p.
Resistance
20 ˚C ( 68 ˚F) Approx. 2.45 kΩ
50 ˚C (112 ˚F) Approx. 0.811 kΩ
80 ˚C (176 ˚F) Approx. 0.318 kΩ
110 ˚C (230 ˚F) Approx. 0.142 kΩ
k
ECM coupler
n
k
Ω
B/Br
B/Bl
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