Checking the component and wiring

Check the cable between engine control module (ECM) terminal #A4 (#A4) and heated oxygen sensor (HO2S) terminal #4. Check for a short-circuit to ground.

Remedy as necessary.

Other information 

• See Connecting the breakout box
• See Signal specification
• See Replacing the mass air flow (MAF) sensor
• See Contents

Fig 1: Identifying Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying VCT2000 Diagnostic Tool

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Intake Air Temperature (IAT) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification