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Home >> Suzuki >> 2003 >> XL-7 Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0448: Evaporative Emissions System - Vent Control Circuit Open >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

Canister vent valve is controlled by PCM. PCM monitors vacuum level via Fuel Vapor Pressure (FVP) sensor input. At an appropriate time, Evaporative (EVAP) canister vent valve is ON, allowing engine vacuum to draw a small vacuum on entire EVAP emission system.

When DTC sets, PCM will not illuminate MIL. PCM will store conditions present when DTC was set as FAILURE RECORDS data only.

A history DTC P0448 will clear after 40 consecutive trip cycles during which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.

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