12-62 FI SYSTEM DIAGNOSIS
ECT SENSOR INSPECTION
The ECT sensor
1
is installed on the cylinder head.
• Remove the ECT sensor. (
below)
• Check the ECT sensor by testing it at the bench as shown in
the figure. Connect the ECT sensor
1
to a circuit tester and
place it in the oil
2
contained in a pan, which is placed on a
stove.
• Heat the oil to raise its temperature slowly and read the col-
umn thermometer
3
and the ohmmeter.
• If the ECT sensor ohmic value does not change in the propor-
tion indicated, replace it with a new one.
ECT sensor specification
09900-25008: Multi-circuit tester set
Tester knob indication: Resistance (
Ω
)
ECT SENSOR REMOVAL AND INSTALLATION
• Drain engine coolant. (
14-3)
• Disconnect the ECT sensor coupler
1
.
• Remove the ECT sensor
2
.
Engine Coolant Temp.
Resistance
20 °C (68 °F)
Approx. 2.58 k
Ω
50 °C (122 °F)
Approx. 0.77 k
Ω
80 °C (176 °F)
Approx. 0.28 k
Ω
110 °C (230 °F)
Approx. 0.12 k
Ω
* Take special care when handling the ECT sensor. It
may cause damage if it gets a sharp impact.
* Do not contact the ECT sensor and the column ther-
mometer with a pan.