Checking the signal cable

Fig 1: Identifying Ignition ON

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition on.

  Connect a voltmeter between connector terminal 2 on the heated oxygen sensor (HO2S) (engine control module (ECM) side) and ground.

  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 3-5 V. 

• OK 

  Refer to Defective heated oxygen sensor (HO2S) 

• NOT OK 

  Refer to Checking the signal 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 2 (control module side) and engine control module (ECM) connector terminal 63 (ECM-18) or terminal 65 (ECM-1C) 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 EMS2000

  Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification