Checking the wiring and component

Check the intake air temperature (IAT) sensor resistance between terminals #1 and #2 on the boost pressure sensor.

Check the signal cable between control module terminal #A5 (#A5) and boost pressure sensor terminal #2. Check for a short-circuit to supply voltage. Check for an open-circuit.

HINT: With the ignition on and the boost pressure sensor connector disconnected, the voltage between terminal #2 and ground must be approximately 5 V. 

Check the ground lead between control module terminal #A60 (#A60) and boost pressure sensor terminal #1. Check for an open-circuit.

If no errors are found and the fault is permanent, replace the intake air temperature (IAT) sensor.

Remedy as necessary.

Other information: 

• To connect the breakout box / access the control module, see Connecting the breakout box
• To access or replace the intake air temperature (IAT) sensor, see Temperature and pressure sensor, replacing
• For resistance values, see Component specifications
• For information about signals, see ELECTRICAL SYSTEM
• See Contents .

Fig 2: Identifying 4-Bit Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Boost Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification