Engine control module (ECM)

Reading off the status of the diagnostic trouble code (DTC): 

• NOTE:

  When reading off the DTC status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.

• Start the engine. Let it idle for at least 15 seconds.
• Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).

Fig 1: Identifying VCT2000

Courtesy of VOLVO CARS OF NORTH AMERICA.

Was the status of the relevant diagnostic trouble code (DTC) permanent? 

• YES 

  Refer to Checking the wiring and component 

• NO 

  Refer to Signal too low. Intermittent fault