engine control module (ECM), replacing

If the difference between the pressures is greater than 140 hPa, try replacing the boost pressure sensor.

HINT: Normal atmospheric pressure is 1013 hPa. Check which of the sensors appears to display the incorrect reading.

If the fault is not in the boost pressure sensor, replace the engine control module (ECM).

NOTE:

The atmospheric pressure sensor is built into the engine control module (ECM) and therefore cannot be replaced as a separate item.

CAUTION:

new engine control module (ECM)s (ECM) are supplied without software. The engine control module (ECM) must be programmed before it will function after replacement.

Remedy as necessary.

Other information:

Normal atmospheric pressure is 1013 hPa
To access or replace the boost pressure sensor, see Temperature and pressure sensor, replacing
To access or replace the engine control module (ECM), see engine control module (ECM), replacing
For information about signals, see ELECTRICAL SYSTEM

Fig 1: Identifying 4-Bit connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Boost Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to Verification