S80 T6 Executive L6-2.8L Turbo VIN 90 B6284T (2001)
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constant idle speed compensation for the air conditioning (A/C) compressor load.
The sensor is linear. It is grounded in the control module and supplied with a 5 Volt current from the control module. A linear signal (between 0-5 V
depending on the pressure in the air conditioning (A/C)) is transmitted to the control module. Low pressure produces low voltage, high pressure produces
high voltage.
The engine control module (ECM) can diagnose the air conditioning (A/C) pressure sensor. The sensor value can be read off using VIDA.
The air conditioning (A/C) pressure sensor is positioned on the high pressure delivery line for the air conditioning (A/C) system.
Heated oxygen sensors (HO2S)
Front heated oxygen sensor (HO2S)
The front heated oxygen sensor (HO2S) is used to provide the engine control module (ECM) with information about the remaining oxygen content of the
exhaust gases in front of the three-way catalytic converter (TWC). This information is used by the engine control module (ECM) so that it can
continually check the combustion so that lambda=1. lambda=1 is the ideal fuel-air ratio, with 14.7 kg air/1 kg fuel.
The heated oxygen sensor uses current control and its signal characteristic is linear. With a linear signal characteristic, the amplitude of the signal curve
is low when changing the oxygen content in the exhaust gases. The probe consists of a preheating element (see "Pre-heating heated oxygen sensors") and
the actual lambda sensor. The lambda sensor is an oxygen sensitive ceramic body consisting of zirconium oxide. The control module supplies power to
the ceramic body, which reacts to the oxygen content of the exhaust gases. This in turn affects the signal to the Engine Control Module (ECM). In order
to determine the oxygen content in the exhaust pipe, the heated oxygen sensor needs reference air from the surrounding air. This reference air reaches the
heated oxygen sensor via the cable harness.
Caution! The cable harness for the heated oxygen sensors (HO2S) must not be trapped or damaged in any way. The connectors for the heated
oxygen sensors (HO2S) must not be greased under any circumstances. The oil in the grease would disrupt the reference air and the function of
the heated oxygen sensors (HO2S).
The engine control module (ECM) can diagnose the heated oxygen sensor. VIDA can be used to read off the calculated lambda value from the heated
oxygen sensor.
Rear heated oxygen sensor (HO2S)
