Atmospheric pressure sensor (539), T8: Connection

PIN DESCRIPTION

Pin No.	Signal type	Description
1	Power supply, 5V	Connected to ECM pin 42(A).
2	Ground	Connected to ECM pin 30(A).
3	Signal	Connected to ECM pin 8(A).

Fig 1: Identifying Atmospheric Pressure Sensor (539), T8 Functional Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Atmospheric Pressure Sensor (539), T8 Circuit Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The electronics in the sensor are of the semiconductor type and mounted on chips, which on changes in air pressure bend and thus pass more or less voltage depending on the external air pressure.