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Home >> Chevrolet >> 2018 >> Trax Premier, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Engine Controls And Fuel - 1.4L (LE2) - Diagnostic Information And Procedures (P0325-P2635) And Symptoms) >> Diagnostic Information and Procedures >> DTC P0451-P0454 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

The fuel tank pressure sensor measures vapor pressure or vacuum in the evaporative emission (EVAP) system. The engine control module (ECM) supplies a 5 V reference and a low reference circuit to the fuel tank pressure sensor. The fuel tank pressure sensor signal voltage varies depending on EVAP system pressure or vacuum. The controller also uses this fuel tank pressure signal to determine atmospheric pressure for use in the engine-off small leak test, DTC P0442. Before using this signal as an atmospheric reference it must first be re-zeroed.

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