Checking the ground lead

Connect an ohmmeter between connector terminal 1 for the air conditioning (A/C) pressure sensor and the ground terminal.

Fig 1: Identifying Air Conditioning (A/C) Pressure Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

The ohmmeter should read approximately 0 Ω. 

• OK 

  Refer to Defective air conditioning (A/C) pressure sensor 

• NOT OK 

  Refer to Checking the ground lead 

Check the cable between connector terminal 1 for the air conditioning (A/C) pressure sensor (control module side) and engine control module (ECM) terminal #77. Check for an open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Fig 1: Identifying Air Conditioning (A/C) Pressure Sensor Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying EMS2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification