Checking wiring

Check the signal cable between engine control module (ECM) terminal #45 and heated oxygen sensor (HO2S) terminal 4. Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . Remedy if necessary.

Check the intake system for air leakage according to intake system/leak test .

Try a new heated oxygen sensor (HO2S) if no fault is found in the above fault-tracing.

Other information 

• To connect the breakout box, see Connecting the breakout box. EMS 2000
• To replace the heated oxygen sensor (HO2S), see Replace the front heated oxygen sensor (HO2S) .

Fig 1: Identifying Heated Oxygen Sensor (HO2S) 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.

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