Coolant Temperature Sensor, Basic Function - GF07.04-P-2002A
Engine All (4xWD)
Engine All (CAR)
Example illustration: coolant temperature sensor
Example illustration: coolant temperature sensor and resistance curve
Overview
This document contains information on:
- General
- Function
General
The coolant temperature sensor (1) permanently detects the coolant temperature. The detected coolant temperature is transmitted as a voltage signal to the combustion engine control unit in order to draw conclusions regarding the engine temperature.
Function
The coolant temperature sensor (1) detects the coolant temperature and transmits a corresponding voltage signal to the combustion engine control unit.
The NTC resistor installed in the coolant temperature sensor (1) consists of a temperature-dependent semiconductor material that reduces its electrical resistance as the coolant temperature increases. The combustion engine control unit supplies the NTC resistor with approx. 5 V via a series resistor.
NTC (negative temperature coefficient): The electrical resistance falls as the temperature rises (NTC thermistor).
The signal voltage is plausible between 0.1 V and 4.93 V. If the signal voltage is outside the tolerance, an error is detected and the combustion engine control unit adopts a substitute value from a stored temperature model.
| Detailed information | |||
| Coolant temperature sensor, detailed information | Engine 260, 282, 608, 656 | GF07.04-P-2502A | |
| Engine 139 in model 232, 236 Engine 254 in model 167 as of model year 2023 Engine 254 in model 214, 236 Engine 256 in model 167, 214, 236 |
GF07.04-P-2502D | ||
| Component descriptions | |||
| Coolant temperature sensor, component description | Model 223 | GF20.40-P-1001A | |
| Model 206 | GF20.40-P-1001C | ||
| Model 254 | GF20.40-P-1001H |