Checking communication with the engine control module (ECM)

Fig 1: Checking Traffic Load On CAN Cables

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition on.

  Read off the DTCs from the Engine control module (ECM).

  Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is communication established? 

• YES 

  Refer to Replacement of the immobilizer control unit 

• NO 

  Refer to Fault-tracing information