Pressure sensor, A/C (620) T8, B207
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Pressure sensor, A/C (620) T8, B207
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Pressure sensor A/C (620)
The value is used by ECM, for load compensation depending on the A/C compressor load of the engine. Also used for radiator fan logic and block conditions (pressure switch) in the A/C system.
The pressure sensor contains two metal-coated ceramic discs mounted close together. The disc closest to the pressure connection is thinner and bends when it comes under pressure. This modifies the capacitance between the metal coatings of the discs as a function of the pressure. Built into the sensor is a circuit which converts the capacitance to an analogue voltage.
T8
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Pin no.
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Signal type
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Description
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A
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Ground
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Connected to ECM pin 18(A).
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B
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Power supply, 5 V
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Connected to ECM pin 41(A).
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C
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Signal
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Connected to ECM pin 7(A).
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The pressure sensor is secured to the A/C pipe on the high-pressure side. Based on the pressure in the intake manifold, the pressure sensor provides a proportional voltage to control module pin A7.
