9-3 (9440) L4-2.0L Turbo (2.0 T) (2006)
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which quickly warms RH. As RH warms, resistance gradually increases and a state of equilibrium is created.
If RH is cooled by a stream of air, its temperature will be increased again immediately by increased current through transistor T1. The voltage needed to
keep RH resistance constant is fed to a frequency converter which in turn controls transistor T2. T2 grounds the control module input with a frequency
corresponding to air mass flow. The ground pulses are 40 ms long.
Temperature sensor resistor RS, together with R2, is part of a circuit whose purpose is to correct amplifier A so that RH's temperature is always 220
degrees C above the air temperature.
The control module coverts the frequency to grams of air per second and then, using the value from the crankshaft position sensor, to milligrams of air
per combustion. This unit is written as mg/c (milligrams per combustion) and constitutes the primary measurement value for fuel injection. 14.7 mg/c
normally uses 1 mg fuel. This value is also a good gauge of engine torque or load.
