Question about 1998 Lexus Gs 400
My check engine light came on today with a code of P0446. Please help me understand what this code means. THANKS!
Possible leaks, clogs, malfunctioning VSVs (vacuum switching valves), and faulty Evap charcoal canister. This system is designed to remove harmful vapors in the fuel system and preventing these vapors to enter the atmosphere, regulate fuel pressure, by sending it into the combustion chamber to be burnt.
Diagnostics for P0446:
1. Inspect vacuum hoses and pipes
between EVAP (Purge) VSV and
Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and
Hopefully this helps
Posted on Aug 16, 2009
You may need a shop manual for this.
Code 446 is a problem with the performance of the EVAP system. The computer applies a vac to the system and then watches how long it takes to drop to zero. Just about any component in the system including the hoses and gaskets could cause the code, including the vapor canister.
Posted on Jun 11, 2013
Hello each of you. I received code P0446 on my OBD2 tool Evap Control System Vent Control Circuit....My truck is a GMC-Jimmy 1996, what could be the problem, please help, it will be very appreciate and thank you.
Posted on Jun 11, 2013
Tips for a great answer:
Jan 25, 2017 | Pontiac Cars & Trucks
Sep 01, 2014 | Cars & Trucks
Mar 18, 2013 | Cars & Trucks
Jan 23, 2012 | Cars & Trucks
Sep 30, 2011 | 1998 Cadillac Seville
Evaporative Emission Control System Vent Control Circuit Malfunction
What does that mean? Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:
May 14, 2011 | Isuzu Rodeo Cars & Trucks
Nov 17, 2010 | 1999 Chevrolet Silverado 1500
2,045 people viewed this question
Usually answered in minutes!