Checking the status

Read off the status of the waking signal for the engine control module (ECM).

Change the ignition key position from position I to II.

Check if the fault is permanent or intermittent.

The status of the wake-up signal for the engine control module (ECM) must change when changing the ignition key position.

If the status of the waking signal for the engine control module (ECM) does not change, the fault is permanent.

If the status of the waking signal for the engine control module (ECM) changes, this is an indication that the fault was present previously but that it is not active at the moment, i. e. the fault is intermittent.

Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Checking components and wiring