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ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME014018840208

  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 or PCM terminal 38 voltage are out of specification, perform the "Circuit Open/Short Inspection".

Measure the ECT sensor resistance.

ECT (°C {°F}) | Resistance (kilohm)
--- | ---
20 {68} | 3540
80 {176} | 3.64.1

ECT sensor characteristics graph (reference)

## 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 (harness-side) and PCM terminal 38
  - ECT sensor terminal B (harness-side) and PCM terminal 91

### 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 ground
  - ECT sensor terminal B (harness-side) and power supply