Mazda 6 Service Manual: Engine coolant temperature (ect) sensor inspection

Mazda 6 Service Manual / Fuel and emission control systems / Control system / Engine coolant temperature (ect) sensor inspection

Note

Perform the following inspection only when directed.

ECT Sensor Resistance Inspection

1. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS.)

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 an ohmmeter.

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

Specification

Circuit Open/Short Inspection

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

2. Inspect the following wiring harnesses 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 1M (harness-side)

- ECT sensor terminal B (harness-side) and PCM terminal 2H (harness-side)

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 GND

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

Engine coolant temperature (ect) sensor removal/installation

Warning When the engine is hot, it can badly burn. Turn off the engine and wait until it is cool before removing the ECT sensor. 1. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARN ...

Crankshaft position (ckp) sensor inspection

Note Perform the following inspection only when directed. Resistance Inspection 1. Disconnect the CKP sensor connector. 2. Measure the resistance between CKP sensor terminals A and B using an ...

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