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Home >> Subaru >> 2011 >> Legacy Premium, Automatic CVT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0442 Evaporative Emission Control System Leak Detected (Small Leak) >> Outline Of Diagnosis >> Notes

Outline Of Diagnosis: Notes

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Check if there is a leakage in fuel system or not, and perform the function diagnosis of valve.

Fig 1: Evaporative Emission Control System Diagram
G07912177Courtesy of SUBARU OF AMERICA, INC.

In this system diagnosis, check for leakage and valve function is conducted by changing the fuel tank pressure and monitoring the pressure change using the fuel tank pressure sensor. When in 0.04 inch diagnosis, perform in the order of mode Z → mode A → mode B → mode C and mode D; When in 0.02 inch diagnosis, perform in the order of mode A → mode B → mode C → mode D and mode E.