EGR System
- Check and clean vacuum modulator filters with compressed air before proceeding with test.
- Disconnect vacuum hose from EGR valve and, using a "T" connector, connect a vacuum gauge. Check that engine starts and runs at idle.
- Check BVSV with coolant temperature below 113°F (45°C) on Camry and 86°F (30°C) on Celica. Check that vacuum gauge indicates zero at 2500 RPM on Camry and 3500 RPM on Celica.
- Check BVSV and EGR vacuum modulator with engine hot. Vacuum gauge should indicate low vacuum at 2500 RPM on Camry and 3500 RPM on Celica.
- Disconnect vacuum hose from port "R" of EGR vacuum modulator and connect port directly to intake manifold vacuum.
- Vacuum gauge should indicate high vacuum at 2500 RPM on Camry and 3500 RPM on Celica. Disconnect vacuum gauge and reconnect hoses to proper locations.
NOTE:
This will cause slight engine misfire due to a large amount of exhaust gas being injected into intake manifold.