For optimal shift characteristics, the EGS control module requires the input signal from the transmission temperature sensor. At very low transmission oil temperatures, the shifting forces to be applied are high; at operating temperature, they are correspondingly low. The transmission temperature sensor is installed in the mechatronics module. Activation of the converter lockup clutch, among other things, is controlled according to the transmission oil temperature.
The transmission temperature sensor is a thermistor where the output value changes according to the transmission oil temperature. The sensor has negative temperature coefficient. With rising temperature, the resistance falls and with falling temperature the resistance increases. The EGS control module sends a reference signal to the sensor and measures the voltage drop in the circuit. At low transmission oil temperature, the sensor resistance is high and the EGS control module picks up a high signal voltage. When the transmission oil temperature rises, the resistance becomes lower and the signal voltage drops.
Index |
Explanation |
Index |
Explanation |
|---|---|---|---|
1 |
Electronic module |
2 |
Hydraulic unit (hydraulic selector unit) |
3 |
Transmission oil temperature sensor |
|
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The following system function is described:
Below the following transmission oil temperature, the converter lockup clutch is not regulated or closed.
The automatic transmission oil is cooled in the cooling circuit. A thermostat is installed in the transmission oil cooler. The thermostat is opened or closed on a temperature-dependent basis.
The transmission temperature sensor can not be replaced separately.
Relevant faults for the sensor system
The following faults are treated in the test module:
The internal temperature sensor is integrated in the EGS control module.
No liability can be accepted for printing or other faults. Subject to changes of a technical nature