What is a VSV on a Toyota?

What is a VSV on a Toyota?

The vacuum switching valve (VSV) is a part of the exhaust gas recirculation (EGR) system of the 1998 Toyota Camry. 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).

What is a VSV sensor?

The simple On-Off Vacuum Switching Valve (VSV) ISC system is controlled by signals from the ECU or directly by tail lamp and rear window defogger circuits. The VSV allows only a small amount of air to by-pass the closed throttle valve when it is open, increasing engine speed by about 100 rpm when energized.

How do I know if my VSV is bad?

Check the resistance. Remove the electrical connector from the VSV and check the resistance across the terminals using an ohmmeter. The resistance should be 33 to 39 ohms (at an air temperature of 68 degrees). Resistance outside this range indicates that the VSV is bad (References 1).

What happens when EGR valve goes bad?

A faulty EGR valve can cause problems with the flow and operation of the EGR system leading to performance issues including a reduction in power, reduced acceleration and decreased fuel efficiency. EGR valves can become stuck ‘open’ or ‘closed’ due to a build-up of soot particles, carbon deposits and dirt from fuel.

What does VSV valve do?

The vacuum switching valve (VSV) which controls the vacuum supply to the actuator is normally closed and passes vacuum to the actuator when it is energized by the ECU. The ECU actuates the VSV to close the valve when the throttle position is 60% or greater and engine speed is 3,900 RPM or more.

How does VSV valve work?

The vacuum switching valve (VSV) which controls the vacuum supply to the actuator is normally closed and passes vacuum to the actuator when it is energized by the ECU. By energizing the VSV vacuum is passed to the actuator, closing the air control valve. This effectively lengthens the intake manifold run.

How do you fix trouble code P0446?

Gas caps are relatively inexpensive and are often the fix for code P0446. If the fuel cap didn’t fix it, perform an EVAP system leak check: Pinch off the vent tube to the EVAP Vent Control Valve. Pressurize the EVAP system with an EVAP smoke machine leak checker.

What is the VSV on a Toyota vacuum?

A/C idle-up vacuum switching valve (genuine Toyota parts This is the VSV bolted to your valve cover. It hooks to the A/C idle up diaphragm and it raises the idle slightly when you turn the A/C on to keep it from having a low/rough idle with the a/c on. Includes pre-cut vacuum lines attached.

What does a particular VSV do in a car?

So there is this VSV on the passenger side of the engine bolted to the side of the head that takes a vacuum from the intake manifold and switches that vacuum to the fuel pressure regulator. And this interesting attached diagram shows that there is a variation of the system where it is NOT present, see the box in the diagram that says W/O COOLER.

How does the VSV system control engine speed?

The VSV allows only a small amount of air to by-pass the closed throttle valve when it is open, increasing engine speed by about 100 rpm when energized. This ISC system does not control cold fast idle, and engines equipped with the system use a mechanical air valve for cold engine fast idle.

How does the VSV hook up to the a / C?

This is the VSV bolted to your valve cover. It hooks to the A/C idle up diaphragm and it raises the idle slightly when you turn the A/C on to keep it from having a low/rough idle with the a/c on. Includes pre-cut vacuum lines attached.