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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 P24B9-P24BB: Evaporative Emission (EVAP) System Leak Detection Pump Pressure Sensor >> 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 three main components:

The EVAP leak detection pump pressure sensor performs a correlation to barometric pressure (BARO). After a short delay period, the EVAP leak detection pump pressure sensor, absolute, reading is compared to the BARO. Large deviations will increment the fail counter threshold and sets a P24B9.

There are two different threshold calibrations used in the comparison to the BARO. A smaller threshold is used when there has been a recent BARO update and then a larger threshold value is used when there has not been a recent BARO update.

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