Location
In engine 471.9 up to engine end number 032690, the fuel temperature sensor (B602) is located on the left side of the crankcase on the fuel filter module.
Engine 471.9 up to engine end number 032690 |
B602 | Fuel temperature sensor |
W47.50-1010-12
W47.50-1024-09
Engines 470.9, 473.9 and engine 471.9 from engine end number 032691 |
1 | Fuel filter module | B602 | Fuel temperature sensor | |
2 | Electrical connector |
Location
In engines 470.9, 473.9, and engine 471.9 from engine end number 032691, the fuel temperature sensor (B602) is located on the fuel high-pressure pump.
Task
The engine management (MCM) control unit (A4) determines the fuel temperature over the fuel temperature sensor (B602).
Structure
There is an NTC resistor inside the fuel temperature sensor (B602). NTC stands for "Negative Temperature Coefficient", which means that electrical resistance falls as temperature rises.
Function
The fuel at the fuel temperature sensor (B602) influences the temperature measuring element inside the sensor depending on its temperature and thus the size of the electrical resistance. The engine management control unit (MCM) (A4) derives the associated temperature from the electrical resistance.