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Home >> Subaru >> 2006 >> Baja Turbo, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0442 - Evaporative Emission Control System Leak Detected (Small Leak) - >> Outline Of Diagnosis

Outline Of Diagnosis

WARNING: This page is about a different variant/trim than selected.

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
G04988928Courtesy of SUBARU OF AMERICA, INC.

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