Checking the connectors and components

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off
Check the connectors for the rear heated oxygen sensor (HO2S) and control module. Check for contact resistance and oxidation according to Contact resistance and oxidation
Check the signal cable between terminal #4 for the rear heated oxygen sensor (HO2S) and control module terminal #44. Check for an intermittent open-circuit according to Open-circuit, intermittent faults
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box. EMS 2000
- To replace the rear heated oxygen sensor (HO2S), see Replacing lambda sond rear .
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.