Engine Oil Temperature Sensor, Basic Function - GF18.30-P-2000A

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Engine All (4xWD, CAR)

Example of engine oil temperature sensor

Courtesy of MERCEDES-BENZ USA

Overview

This document contains information on:

General
Function

General

The engine oil temperature sensor (1) records the engine oil temperature.

Function

The engine oil temperature sensor (1) has an integrated precision resistor with a negative temperature coefficient (NTC).

The NTC resistor changes its electrical resistance according to the engine oil temperature.

The electrical NTC resistance decreases as the temperature increases (NTC thermistor).

The resistance variation results in a voltage signal. The combustion engine control unit calculates the engine oil temperature from the voltage signal.

The combustion engine control unit permanently evaluates the voltage signal. If the engine oil temperature is too high, a power output limitation is initiated by the combustion engine control unit.

Any fault in the engine oil temperature sensor (1) is detected by the combustion engine control unit and entered in the fault memory.

Component descriptions
Engine oil temperature sensor, component description	Engine 656 in model 223	GF18.30-P-2013A
	Engine 654, 656 in model 167 as of model year 2023	GF18.30-P-2013M