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Temperature Sensor

Frequently Asked Questions

The coolant temperature sensor is a small, two-pin device that signals the engine temperature to the engine control module (ECM). This signal determines the engine's warm-up enrichment and fast idle speed. The coolant temperature sensor detects coolant temperature and informs the driver if the engine is overheating. If the sensor detects a high temperature, it activates the engine overheating warning light.

The coolant temperature sensor detects the temperature of the coolant in the engine. The coolant temperature sensor is located in the heart of the engine, near the cylinder head. This sensor is located either on the engine or in one of the coolant passages in the cylinder head.  The temperature of the engine reaches a maximum.

Step 1: Make sure the vehicle is on a level work surface.

Step 2: Locate the coolant temperature sensor.

Step 3: Check the clearance at the front of the vehicle.

Step 4: Remove the radiator cap and cap screw.

Step 5: Drain the radiator.

Step 6: Replace the drain plug.

Step 7: Remove the wiring harness from the temperature sensor.

Step 8: Remove the coolant temperature sensor.

Step 9: Clean the hole where the sensor is located.

Step 10: Install the new sensor.

Step 11: Reattach the wiring harness to the sensor.

Step 12: Make sure the radiator drain plug is tight.

Step 13: Add coolant to the radiator.

Step 14: Add coolant to the coolant reservoir.

Step 15: Remove the coolant pans.

Step 16: Lower the vehicle from the jacks.

The coolant temperature sensor, also known as the engine coolant temperature (ECT) sensor, is a critical component that reads the engine coolant temperature and sends this information to the engine control unit (ECU). The ECU then uses this information to adjust fuel injection, ignition timing, and other engine management functions.

It's important to note that the coolant temperature sensor itself cannot be reset. It's a simple device that changes its resistance with temperature - nothing is stored on it and it has no software. If you suspect it's not working properly, you can test its resistance with a multimeter. If the sensor is faulty, it needs to be replaced.

The coolant temperature sensor is one of the most important engine management sensors because its reading plays a key role in calculations that affect engine performance. Signs of engine overheating can be detected by looking for the following symptoms:

White smoke from the hood;

Engine overheating;

Poor fuel economy;

Loss of engine power;

A throaty sound coming from the engine;

A warning light indicates an engine problem.

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