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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (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 >> 0.04-inch Diagnosis

0.04-inch Diagnosis

WARNING: This page is about a different variant/trim than selected.
Fig 1: DTC P0442 Evaporative Emission Control System Leak Detected - Communication Diagram
G03830122Courtesy of SUBARU OF AMERICA, INC.
0.04-INCH DIAGNOSIS

Mode Mode Description Diagnosis Period
Mode Z (CPC open fail diagnosis) Perform the diagnosis of CPC open fail depending on the amount of the tank pressure change after the diagnosis has started. 3 - 16 seconds
Mode A (Estimated evaporation amount) Calculate the tank pressure change amount (P1). 10 seconds
Mode B (Sealed negative pressure, large leakage judgment) Introduce the intake manifold pressure to the fuel tank and reduce the tank pressure to the desired value. If the tank pressure cannot be reduced, diagnose that there is large leakage. 5 - 25 seconds
Mode C (Pressure increase check advanced OK judgment) Wait until the tank pressure becomes to the target value (pressure to start calculating P2). If the tank pressure does not return to make advanced OK judgment. 1 -15 seconds
Mode D (Negative pressure variation measurement evaporation leakage diagnosis) Calculate the tank pressure variation (P2), and obtain the diagnostic value using P1 of Mode A. Perform the evaporation leakage diagnosis using the diagnosis value. 10 seconds