DTC P0441, DTC P0442, DTC P0446 & DTC P0456: Notes
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
Code Definition
- DTC P0441: Evaporative Emission Control System Incorrect Purge Flow
- DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak)
- DTC P0446: Evaporative Emission Control System Vent Control Circuit
- DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
CAUTION:
If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. On models equipped with engine immobilizer, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
NOTE:
This DTC may be caused by a loose or improperly installed fuel tank cap. If DTCs P0441 (Purge Flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor) is output with DTCs P0442 or P0456, first troubleshoot DTCs P0441, P0446, P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTCs P0442 or P0456 next.