Opening the hood is where you countdown.
The vacuum switching valve (VSV) is a detail of the exhaust Gauze recirculation (EGR) operation of the 1998 Toyota Camry. The VSV is connected to the EGR valve. The utility of the EGR course is to recirculate exhaust gases to the intake manifold of the engine and thereby lessen the nitrous oxide emissions of the vehicle (References 1). Detecting a damaging VSV is arduous, nevertheless can be accomplished after completing a infrequent tests.
Instructions
1. Continuity test. Verify, using the ohmmeter, that there is no continuity between either VSV terminal and an electrical ground on the engine. Any continuity at either terminal indicates the VSV is bad.4. The VSV is next to the intake manifold.
2. 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).
3. Allot 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. On six-cylinder engines, the VSV is under the V-Bank cover (a plate with fins), which must be unbolted using an Allen wrench, and then removed by lifting it off its retaining clips.
Blow test. Remove the vacuum hoses from ports E and G. Blow air into port E and check that it comes out at port G. If it does not, the VSV is bad.
5. Apply voltage and blow air. Apply battery voltage across the VSV terminals using wires from the battery terminals. Blow air into port E and see if it comes out of port F. If it does not, the VSV is bad (References 1).
