Signal missing: Verification

HINT: After rectifying a fault, a verification should be carried out. 

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Checking Traffic Load On CAN Cables

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Reinstall the connectors, components etc.
• Ignition on.
  NOTE:

  For certain faults in the CAN-net where control modules have stopped communicating, it may help to disconnect/reconnect the battery  o "restart" the control module/CAN-net.

  • Erase diagnostic trouble codes (DTCs) in all control modules.
  • Ignition off.
  • Ignition on.
  • Start the vehicle. Allow the vehicle to run for 10 minutes.
  • Read out the diagnostic trouble codes in the vehicle via the DIAGNOSTICS tab.

Does the diagnostic trouble code (DTC) for faulty communication return? 

• YES 

  The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

  Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

• NO 

  OKAY:  Troubleshooting has been completed.