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

id0140b6802000

  Note

  • 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.

  • If not as specified, replace the ECT sensor.
  • If the ECT sensor is normal, but 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 Turbo].)

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

### Open circuit

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

### Short circuit

  • 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