Engine Coolant Temp Sensors - What Are They? How Do They Work?

What do they do?

Determine the exact temperature of the engine coolant.

How do they work?

Analog sensor readings are sent back to the ECM to ensure a proper air/fuel ratio by adjusting the fuel injection and ignition timing.

Where are they located?

On the cylinder head, engine block, thermostat housing or intake manifold.

Symptoms of failure

• Check engine light
• No/erratic gauge operation
• No/erratic cooling fan operation
• Engine overheating
• Rough idle
• Engine hesitation
• Poor fuel economy
• Failed emissions test

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