#
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3]

BME014018841W02

  Note

  • Perform the following inspection only when directed.

## ECT Sensor Resistance Inspection

1. Drain the engine coolant.

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 an ohmmeter.

  • If not as specified, replace the ECT sensor.
  • If the ECT sensor is okay, but ECT PID value is out of specification, perform the "Circuit Open/Short Inspection".

Specification

Water temperature (°C {°F}) | Resistance (kilohm)
--- | ---
20 {68} | 35.48-39.20
70 {158} | 5.07-5.60
80 {176} | 3.65-4.02

## Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [L3].)

2. Inspect the following wiring harnesses for open or short. (Continuity check)

### Open circuit

  • If there is no continuity, the circuit is open. Repair or replace the harness.
  - ECT sensor terminal A (harness-side) and PCM terminal 1M (harness-side)
  - ECT sensor terminal B (harness-side) and PCM terminal 2H (harness-side)

### Short circuit

  • If there is continuity, the circuit is shorted. Repair or replace the harness.
  - ECT sensor terminal A (harness-side) and power supply
  - ECT sensor terminal A (harness-side) and body GND
  - ECT sensor terminal B (harness-side) and power supply