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Home >> Isuzu >> 2008 >> Ascender LS, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Engine Control System & Fuel System - 4.2L - DTC P0366 T0 DTC P2544) >> DTC P0446 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Envoy and 2009 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON and fuel cap removed, verify that the FTP sensor parameter is between 1.3-1.7 volts.
  2. Install the fuel cap.
  3. With the engine running, the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 12 inches H2O.
    • If the fuel tank vacuum is greater than the specified range, go to the restriction section in Circuit/System Testing below.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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