Emissions - DTC P0440/P0455 or P0442 Diagnostics
Information IB05-03-S001Diagnostic Aids for Diagnostic Trouble Codes P0440, P0455 and/or P0442 - Evaporative Emission (EVAP) System Leak
Light Duty ASCENDER 2003 Information EMISSIONS 03/01/05
Light Duty ASCENDER 2004 Information EMISSIONS 03/01/05
Light Duty ASCENDER 2005 Information EMISSIONS 03/01/05
ISSUE DATE: MARCH 2005
Affected Vehicles
2003-2005 Isuzu Ascender (US/UT).
Service Information
This bulletin is being published to aid technicians in the diagnosis of DTCs P0440, P0455 and/or P0442.
It is possible that a fracture as small as 0.508 mm (0.020 in) may be found in the fuel tank filler neck, causing a DTC P0440, P0455 and/or P0442 to set. Due to the location above the liquid fuel level, this small fracture will not cause a visible fluid leak.
The technician should pay particular attention to the fuel tank filler neck area while performing the smoke test outlined in the Service Manual. Refer to the appropriate diagnostic information for P0440, P0455 and/or P0442 in the Service Manual.
When performing the smoke test outlined in the Service Manual, it may be necessary for the technician to manipulate the fuel tank filler neck in order to see smoke escaping from this minute fracture.
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