Temperatursensor Luft

[amnat]

M62 (9)  

The dual temperature sensor for the coolant is installed in the water pump housing. This dual temperature sensor is located at the point where the coolant flows out of the engine.

Intake Air Temperature Sensor (NTC-I)
The intake air temperature sensor is mounted in the clean air bowl of the air cleaner  (11)*. A precision NTC resistor is used to convert the "temperature" into a measurement value "resistance" which can be evaluated electrically by the DME control unit.

The intake air temperature sensor is not required for correction of the injection timing since the intake air temperature is taken into consideration automatically during air mass measurement. The intake air temperature sensor (NTC-I) is required during the start procedure in conjunction with the coolant temperature sensor (NTC-II). The resistance values of both sensors supply exact information for calculating the injection timing. In this way hot start problems in particular are avoided.

*) nicht bei der DME ME7.2

In the event of sensors failing, substitute values are made available which enable continued, restricted engine operation. In the event of the speed sensor failing, engine operation is no longer possible on the corresponding row of cylinders.
Component->Substitute measures
Intake temperature sensor->Substitute values active
Engine temperature sensor->Substitute values active
Hot-film mass meter-Substitute value from position of throttle valve (EML information via CAN)

DME MS42:

Bei Ausfall des Kühlmitteltemperatursensors wird ein Fehler im DME-Steuergerät eingetragen und aus dem Wert des Ansauglufttemperatursensors mithilfe eines Temperaturmodells ein Ersatzwert berechnet.