ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [WL-3]

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Note
•  Perform the following inspection only when directed.

Resistance Inspection

1.  Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [WL-3].)

2.  Measure the resistance between the ECT sensor terminals A and B using an ohmmeter.

•  If not as specified, replace the ECT sensor.
•  If as specified, carry out the “Circuit Open/Short Inspection”.

Specification

Engine coolant temperature (°C {°F})

Resistance

(kilohm)
20 {68}
2.21—2.69
80 {176}
0.29—0.34
110 {176}
0.138—0.145

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Circuit Open/Short Inspection

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [WL-3].)

2.  Inspect for an open or short circuit in the following wiring harnesses.

•  If there is an open or short circuit, repair or replace wiring harness.
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Open circuit
•  Power circuit (ECT sensor connector terminal A and PCM connector terminal 1T)
•  Ground circuit (ECT sensor connector terminal B and PCM connector terminal 1B)
Short circuit
•  ECT sensor connector terminal A and PCM connector terminal 1T short to ground
•  ECT sensor connector terminal B and PCM connector terminal 1B short to power supply