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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 P2418-P2420: Evaporative Emission (EVAP) System Leak Detection Pump Switching Valve Control Circuit >> Circuit/System Description

Circuit/System Description

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The evaporative emission (EVAP) system uses an 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) commands the EVAP leak detection pump switching valve to vent or not venting, pumping, position by a switch called a driver. The ECM monitors the commanded state of the driver and the actual state of the control circuit. If they do not match it sets a DTC. The switching valve is located inside the EVAP leak detection pump and is non-serviceable.

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