Engine coolant temperature switch/sensor
on the right side of the engine
Engine Coolant Temperature Sensor.
Start by replacing the Engine Coolant Temperature Sensor
Modern vehicles are equipped with multiple temperature sensors. They are used to advise the engine computer and driver on the condition of the vehicle systems. Common automotive temperature sensors include coolant, transmission, ambient air temperature and engine oil.
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The engine coolant temperature sensor is usually on the front of the engine. The coolant temperature sensor will be in the vicinity of the thermostat housing.
The OBD2 code P0128 for a Saturn SC1 indicates a problem with the engine coolant temperature being below the thermostat regulating temperature. This could be caused by a faulty thermostat, low coolant level, or a malfunctioning coolant temperature sensor. It is important to diagnose and address the issue to prevent damage to the engine.
IAT= intake are temperature sensor ECT= engine coolant temp. sensor
Open the hood and on the drivers side of the engine where the upper coolant hose for the radiator routes to the engine . there is a plastic flange or housing, in that housing the coolnat temp sensor is located .
The computer with input from the engine coolant temperature sensor.
There is NOT a choke on any fuel injected engine. The coolant temperature sensor does the job of what used to be the choke. When the coolant in the engine is cold, the coolant temperature sensor tells the engine control module and it determines how rich or lean to make the engine run. You can use a scanner to see if it and all the other sensors are doing the job they are meant to perform.