How is the VSV connected to the EGR valve?
The VSV is connected to the EGR valve. The function of the EGR system is to recirculate exhaust gases to the intake manifold of the engine and thereby reduce the nitrous oxide emissions of the vehicle (References 1). Detecting a bad VSV is difficult, but can be accomplished after completing a few tests.
Where is the VSV valve on a Toyota?
Here I show how to test the VSV (Vacuum Switching Valve) which resides at the charcoal canister. Toyota calls it the VSV For Pressure Switching Valve. This is one of the diagnostic steps in solving the check engine light trouble code P0446 “Evaporative Emission Control (EVAP) system vent control circuit malfunction”.
What is the function of the EGR system?
The function of the EGR system is to recirculate exhaust gases to the intake manifold of the engine and thereby reduce the nitrous oxide emissions of the vehicle (References 1). Detecting a bad VSV is difficult, but can be accomplished after completing a few tests.
Why is my Toyota VSV not vacuum switching?
EDIT: Refinishing the fuel filler neck (and using a new Toyota fuel cap) did not resolve the issue, so at least I can rule the fuel filler neck out as a cause. Will be checking the other VSVs and the hoses next. Did you find the recommended reading relevant to this discussion?
The VSV is connected to the EGR valve. The function of the EGR system is to recirculate exhaust gases to the intake manifold of the engine and thereby reduce the nitrous oxide emissions of the vehicle (References 1). Detecting a bad VSV is difficult, but can be accomplished after completing a few tests.
What’s the EGR code for a vacuum switching valve?
The dreaded EGR related code for insufficient flow. My intent here is to give other people the information needed to easily change the Vacuum Switching Valve on their 4WD model and avoid disassembling the entire engine.
Where is the VSV located on a car?
Detecting a bad VSV is difficult, but can be accomplished after completing a few tests. Locate the vacuum switching valve. It has three vacuum hoses and a two-wire electrical connector attached to it. On four-cylinder engines, the VSV is located on the rear of the engine below the intake manifold.
How to replace the VSV vacuum switching valve?
Reconnect the second vacuum line to its origin up top and mark that it came from the port in line with the VSV body. Here’s the trick to getting the connector off when you can’t reach it. These are two position adjustable pliers that are about nine inches long.
When to take a Clogged EGR valve to the mechanic?
You’ll know within a day or so whether you are still having a clogged EGR problem. If it turns out you still need to replace the EGR valve, go ahead and take it to your mechanic. But there’s at least a 50 percent chance you’ve solved your problem without spending any cash at all.
The function of the EGR system is to recirculate exhaust gases to the intake manifold of the engine and thereby reduce the nitrous oxide emissions of the vehicle (References 1). Detecting a bad VSV is difficult, but can be accomplished after completing a few tests.
Do you need to replace EGR valve to pass cel inspection?
Unfortunately, sometimes shop owners force their technicians to take the simplest, most obvious route rather than spending extra hours diagnosing a problem more thoroughly. In the shop’s defense, replacing your EGR valve probably would eliminate the error code, turn off the CEL, and allow you to pass emissions inspection.