Ignition Switch "OFF"
Disconnect battery (-) cable.
Refer to "Shop Manual" and disconnect ECTS connector.
Refer to "Shop Manual" and remove ECTS.
Put the ECTS into the engine coolant.
Measure the resistance between Pin No. 1 (Signal) terminal and Pin No. 3 (Ground) terminal of ECTS.
Specification : Refer to table below
※ Resistance value decreases as temperature increases.
Temp.(℃/℉) | -40 / -40 | -20 / -4 | 0 / 32 | 20 / 68 | 40 / 104 | 60 / 140 | 80 / 176 | 100 / 212 | 110 / 230 | 120 / 248 |
Resistance (kΩ) | 48.14 | 14.13 - 16.83 | 5.79 | 2.31 - 2.59 | 1.15 | 0.59 | 0.32 | 0.19 | 0.145 - 0.149 | 0.12 |
Fig.1) Measuring ECTS resistance
Is the measured value within specification?
 | ▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure. |
 | ▶ Carefully re-do this troubleshooting guide steps. ▶ If no problems were found with the circuits or connectors, replace the ECTS and go to "Verification of Vehicle Repair" procedure. |
When installing component, tighten it within specification.
If component is dropped, check for proper operation. The internal damage may be present.
Top up the engine coolant after re-installing engine coolant temperature sensor.
