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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 P145C or P145D: Evaporative Emission (EVAP) System Leak Detection Pump Stuck >> Circuit/System Description

Circuit/System Description

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

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 EVAP leak detection vacuum pump stuck off test is performed by comparing an initial stabilized EVAP leak detection pump pressure sensor, absolute, reading to a second stabilized reading for a short period of time.

The EVAP leak detection vacuum pump stuck on test is performed after the switching valve transitions from vent to not venting, pump, position. If after the second EVAP leak detection pump pressure sensor reading, a difference between the two pressure readings indicates the EVAP leak detection vacuum pump is stuck on.

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