ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3 Turbo]
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3 Turbo]
id0140b6802000
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Note
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• Perform the following inspection only when directed.
ECT Sensor Resistance Inspection
1. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS [L8, LF, L3, L3 Turbo].)
2. Remove the ECT sensor (located above the starter).
3. Place the ECT sensor in water with a thermometer, and heat the water gradually.
4. Measure the resistance between the ECT sensor terminals A and B using a tester.
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• If not as specified, replace the ECT sensor.
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• If the ECT sensor is normal, but PID value is out of specification, perform the "Circuit Open/Short Inspection".
Specification
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Water temperature (°C {°F})
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Resistance (kilohm)
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20 {68}
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35.48-39.20
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70 {158}
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5.07-5.60
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80 {176}
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3.65-4.02
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Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [L3 Turbo].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)
Open circuit
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• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
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- ECT sensor terminal A and PCM terminal 1M
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- ECT sensor terminal B and PCM terminal 2H
Short circuit
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• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
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- ECT sensor terminal A and power supply
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- ECT sensor terminal A and body ground
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- ECT sensor terminal B and power supply
