NOTE:
Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL.)
1. Remove the battery cover.
2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
3. Disconnect the ECT sensor connector.
4. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [LF].)
5. Place the ECT sensor in the water and while increasing the water temperature, measure the resistance between ECT sensor terminals A and B.Standard
If the monitor item status/specification (reference) is not within the specification, even though the ECT sensor resistance is within the specification, perform the “Circuit Open/Short Inspection”.
If not within the specification, replace the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [LF])
Water temperature
(°C {°F})
Resistance (kilohm)
20 {68}
35.48—39.20
80 {176}
3.65—4.02
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF].)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
ECT sensor terminal A and PCM terminal 2AH
ECT sensor terminal B and PCM terminal 2AY
If there is continuity, there is a short circuit. Repair or replace the wiring harness.
ECT sensor terminal A and power supply
ECT sensor terminal A and body ground
ECT sensor terminal B and power supply