XC90 2.5T AWD L5-2.5L Turbo VIN 59 B5254T2 (2003)
The air conditioning (A/C) pressure sensor detects the pressure in the high-pressure side of the air conditioning (A/C) system. This is so the engine
control module (ECM) can control:
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engine cooling fan (FC) start
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stopping the compressor if the pressure in the air conditioning (A/C) is too high
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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. At 0.25 kPa or lower, the voltage is 0 V, at 3100 kPa the
voltage is approximately 4.75 V. Low pressure results in low voltage, high pressure in 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)
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5 cylinder engines have two heated oxygen sensors (HO2S), front and rear
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6 cylinder engines have four heated oxygen sensors (HO2S), front and rear for bank 1 (cylinders 1-3) and front and rear for bank 2 (cylinders 4-6)
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XC90s with 6 cylinder engines utilize the Y-concept, where the engine has two heated oxygen sensors (HO2S) bank 1 (cyl. 1 -3), bank 2 (cyl. 4 -6)
and a rear heated oxygen sensor (HO2S) (bank 1).
Front heated oxygen sensor (HO2S)
