Intake Air Temperature Sensor

The function of intake air temperature sensing has also changed on the M73 engine. The two required sensors for the M7O DME control modules has been reduced to one on the M73.

DME II monitors the air temperature sensor (NTC) located in the air filter housing for cylinder bank II. DME II utilizes the input signal for its required functions. A processed output signal is sent over the CAN Line to the DME I control module.

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.