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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 28 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0010 To P0459) >> Diagnostic Information and Procedures >> DTC P0442: Evaporative Emission (EVAP) System Small Leak Detected >> Circuit/System Description

Circuit/System Description

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This DTC tests the evaporative emission (EVAP) system for a small and large leak when the Vehicle is turned OFF and the correct conditions are met. The propulsion system needs to be OFF for several hours before the small and large leak tests run. The EVAP leak detection pump creates a vacuum across a 0.51 mm (0.020 in) reference orifice. This reference vacuum is then compared to the vacuum level created in the fuel tank to determine if a leak exists

The following table illustrates the relationship between the ON and OFF states and the OPEN or CLOSED states of the EVAP components:

Engine Control Module Command EVAP Canister Purge Solenoid Valve Vacuum Pump Switch Valve
ON Open Pump Runs Pump Position/Not Venting
OFF Closed Pump OFF Vent Position
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