ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [ZJ, Z6]

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ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [ZJ, Z6]

B3E014018840W05

  Note

  • Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See Troubleshooting Procedure.)

## Continuity Inspection

1. Disconnect the ECT sensor connector.

2. Remove the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [ZJ, Z6].)

3. Place the ECT sensor in the water and while increasing water temperature, measure the resistance between terminals A and B.

  • If not within the specification, replace the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [ZJ, Z6].)
  • If the monitor item condition/specification (reference) is not within the specification, even though there is no malfunction, perform the "Circuit Open/Short Inspection".

  ECT sensor resistance

  Water temperature (°C {°F}) | Resistance (kilohm)
  --- | ---
  20 {68} | 2.212.69
  80 {176} | 0.2870.349

ECT sensor characteristics graph (reference)

## Circuit Open/Short Inspection

1. Remove the PCM connector cover.

2. Disconnect the PCM connector. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [ZJ, Z6].)

3. Inspect the following wiring harness for open or short circuit (continuity check).

### Open circuit

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

### Short circuit

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