Checking The Components And Wiring

Check the cable between engine control module (ECM) terminal #A68 (#B8) and heated oxygen sensor (HO2S) terminal #4. Check for an open-circuit. Check for a short-circuit to ground.

Try a new heated oxygen sensor (HO2S) if the above fault-tracing does not remedy the fault.

Remedy as necessary.

Other information 

• see SIGNAL SPECIFICATION (2004, 2005, 2006, 2007)
• see OXYGEN SENSOR (CATALYST MONITOR SENSOR)
• see CHECKING WIRING AND TERMINALS

Fig 1: Identifying 4-Bit Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Rear Heated Oxygen Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to VERIFICATION