Checking the diagnostic trouble codes (DTCs)

Fig 1: Identifying Ignition Switch ON Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition on
• Read off diagnostic trouble codes (DTCs).

  Check if any diagnostic trouble codes (DTCs) are stored for the electronic throttle unit, throttle position (TP) sensor or engine control module (ECM).

  If any of these diagnostic trouble codes (DTCs) are stored, these must be remedied first.

  Fig 2: Identifying VCT2000 Diagnostic Tool

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Are any of the above diagnostic trouble codes (DTCs) stored? 

• YES 

  Refer to Fault-tracing information 

• NO 

  Refer to Checking components and wiring