Checking the power cable

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Connect a voltmeter between connector terminal 1 on the heated oxygen sensor (HO2S) (engine control module (ECM) side) and ground.

  Ignition on.

  Fig 2: Identifying Heated Oxygen Sensor (HO2S) Connector Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Voltage Display

  Courtesy of VOLVO CARS OF NORTH AMERICA.

The voltmeter should read battery voltage for 2 seconds immediately the ignition is switched on. 

• OK 

  Refer to Checking the signal cable 

• NOT OK 

  Refer to Checking the power cable 

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off.

  Check the cable between heated oxygen sensor (HO2S) connector terminal 1 (control module side) and system relay 2/14 base # 3 for an open-circuit according to Open-circuit, permanent faults .

  Remedy as necessary.

  Fig 2: Identifying Heated Oxygen Sensor (HO2S) Connector Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 3: Identifying Ohmmeter

  Courtesy of VOLVO CARS OF NORTH AMERICA.
  Fig 4: Identifying System Relay Base Connector Terminals

  Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification