EVAP - Revised DTC P0440, P0442, P0446, and P1441
File In Section: 6E - Engine Fuel & EmissionBulletin No.: 61-65-31A
Date: August, 1996
Subject:
Section 6E3 - Driveability and Emissions - Revised DTC P0440, P0442, P0446 and P1441
Models:
1996-97 Buick Skylark
1996-97 Chevrolet Cavalier
1996-97 Oldsmobile Achieva
1996-97 Pontiac Grand Am, Sunfire
1996-97 Chevrolet and GMC S Models
with 2.2L, 2.4L Engines (VINs 4, T - RPOs LN2, LD9)
This bulletin Is being revised to add the 1997 model year. Please discard Corporate Bulletin Number 61-65-31 (Section 6E - Engine Fuel & Emission).
This bulletin is being issued to revise the following Evaporative Emission (EVAP) diagnostic trouble codes for the 1996-97 enhanced evaporative emission system vehicles equipped with 2.2L and 2.4L engines:
^ DTC P0440 - Evaporative Emission (EVAP) System/Control System
^ DTC P0442 - Evaporative Emission (EVAP) Control System - Small Leak Detected
^ DTC P0446 - Evaporative Emission (EVAP) Control System - Vent Control/Blocked
^ DTC P1441 - Evaporative Emission (EVAP) Control System Flow During Non Purge
1996 Manuals Only
Some difficulty may be noticed when trying to clear EVAP related DTCs, making it difficult to verify if the vehicle has been repaired. To properly clear EVAP related DTCs, the battery must be disconnected for approximately 30 seconds. The diagnostic scan tool can be used to confirm if the DTCs were cleared.
The final step of the indicated DTCs should be revised to include this procedure as the last step of each diagnostic table.
1996 and 1997 Manuals
Note
The YES and NO columns have been swapped for the original last step in DTCs P0440 and P0442. The revisions as they should appear are attached. Please make a note of these revisions in your Service Manual.