GF07.04-P-6043CY Component Description For the Coolant Temperature Sensor

GF07.04-P-6043CY Component Description For The Coolant Temperature Sensor
- up to model year 08

Component Identification:

The temperature sensor is located at the rear on the left cylinder head.

Task
The temperature sensor detects the coolant temperature and transmits a corresponding voltage signal to the ME-SFI [ME] control unit (N3/10).

Design
The temperature sensor consists of a very rapidly responding NTC resistor and a 2-pin connector. The housing bottom section which is inserted in the cylinder head is made out of metal.

The connection assignment (polarity) of pin 1 and 2 is arbitrary.

Function
The NTC resistor integrated in the temperature sensor alters its electrical resistance in line with the coolant temperature. The ME-SFI [ME] control unit applies a sensor voltage of 5 V and evaluates the signal voltage in accordance with the coolant temperature.

The signal voltage is plausible between 0.1 V to 4.93 V, otherwise a fault is identified and a substitute value taken by the ME-SFI [ME] control unit from a stored temperature model.

NTC means " Negative Temperature Coefficient", which means: the electrical resistance reduces for an increasing temperature (NTC thermistor).

Example: Coolant temperature Resistor
20 °C 3090 ohms ±5%
80 °C 320 ohms ±5%

The NTC resistor is supplied with a 5 V voltage by the ME-SFI [ME] control unit via a series resistor with 1470 ohms ±1%. Following a short- circuit to battery voltage or sensor voltage without series resistor, the temperature sensor is defective.