Mazda 6 manuals

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

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.

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

- 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

- 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

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