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ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME014018841W01

  Note

  • Perform the following test only when directed.

## Resistance Inspection

1. Drain the engine coolant.

2. Remove the ECT sensor.

3. Place the ECT sensor in water with a thermometer, and heat the water gradually.

4. Measure the resistance between the ECT sensor terminals using an ohmmeter.

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

Specification

Water temperature (°C {°F}) | Resistance (kilohms)
--- | ---
20 {68} | 2.2-2.8
80 {176} | 0.29-0.4

## Circuit Open/Short Inspection

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

2. Inspect the following wiring harness 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 and PCM terminal 41
  - ECT sensor terminal B and PCM terminal 20

### Short circuit

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