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Home >> Cadillac >> 2005 >> Escalade ESV >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Engine Control System - 8.1L (DTC P0200 To P0506/P0507)) >> Diagnostic Information and Procedures >> DTC P0449 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2005 GMC Yukon XL, 2005 Chevrolet Suburban, and 2005 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

A battery positive is supplied to the evaporative emission (EVAP) canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent solenoid valve as ON or OFF. The control module monitors the status of the driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.

The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister vent solenoid valve.

EVAP Canister Vent Solenoid Valve ON/OFF States

Control Module Command EVAP Canister Vent Solenoid Valve Position
ON CLOSED
OFF OPEN
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