V70 2.4T L5-2.4L Turbo VIN 58 B5244T3 (2002)
Housing Assembly HVAC: Description and Operation
Air Quality Sensor (Electronic Climate Control Only, Option)
Air Quality Sensor (Electronic Climate Control Only, Option)
The air quality sensor is available as an option for the electronic climate control from model year 2000. Its function is to transmit a signal to the climate
control module (CCM) if it detects increased concentrations of pollutants in the outside air.
The air quality sensor measures the CO(x) and NO(x) content.
The air quality sensor compares current values with previous ones and can calculate changes in pollutant concentrations.
The signal from the air quality sensor to the climate control module (CCM) is a pulse width modulation (PWM) signal and has four stages, 0-3:
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signal 0 = no increase in or reduced pollutant level.
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signal 1 = gradual increase in pollutant level.
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signal 2 = moderate increase in pollutant level.
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signal 3 = rapid increase in pollutant level.
The control module uses the signal to control the recirculation damper motor.
The air quality sensor is located on the right-hand side of the fresh air intake under the cowl.
There are diagnostics for the air quality sensor.