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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1462: Evaporative Emission (EVAP) System Reference Orifice Flow Erratic >> Circuit/System Description

Circuit/System Description

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The evaporative emission (EVAP) system uses a EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:

The engine control module (ECM) monitors the pressure across the reference orifice with the EVAP leak detection pump pressure sensor. When all conditions are met, the ECM commands the vacuum pump ON and monitors the EVAP leak detection pump pressure sensor. If the ECM detects the pressure is not stabilized, the DTC will set.

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