#
ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR-CD (RF Turbo)]

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  Note

  • Perform the following test only when directed.

## Resistance Inspection

1. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)])

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

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

  • If not as specified, replace the ECT sensor.
  • If ECT sensor is okay, perform the "Circuit Open/Short Inspection".

Specification

Water temperature (°C {°F}) | Resistance (kilohm)
--- | ---
20 {68} | 2.21-2.69
80 {176} | 0.29-0.34

## Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)])

2. Inspect for open/short circuit in the following wiring harnesses.

  • If there is open/short circuit, repair or replace wiring harness.

### Open circuit

  • ECT sensor terminal A and PCM terminal 51
  • ECT sensor terminal B and PCM terminal 70

### Short circuit

  • ECT sensor terminal A and power supply
  • ECT sensor terminal A and body ground
  • ECT sensor terminal B and power supply