Checking other diagnostic trouble codes (DTCs), engine control module (ECM)

HINT: This diagnostic trouble code (DTC) can only be stored after a refueling. The diagnostic detects major leaks in the fuel tank system. The most likely cause is that the fuel tank filler cap has not been installed correctly. For further information about this diagnostic trouble code (DTC), select Information, then DTC information. 

HINT: In the event of a permanent fault, a diagnostic trouble code (DTC) for a "Major leak" will also be stored after the major leak diagnostic is complete. 

• Check if the diagnostic trouble code (DTC) for "Major leak" is stored in the engine control module (ECM), if so, fault-trace from it instead.
• If no diagnostic trouble code for "Major leak" is stored, perform a quick test of the tank system via VEHICLE COMMUNICATION to ensure that the fault was intermittent and probably caused by the fuel tank filler cap?