EGR Function Testing Toyota Land Cruiser 60

VACUUM MODULATOR

1. Disconnect vacuum hoses from ports "P", "Q" and "R" of vacuum modulator. Plug ports "P" and "R" (2 ports on same side) and blow through port "P" (single port on opposite side). Air should escape freely from filter.
2. Start engine and run at 2000 RPM on Camry, 3000 RPM on Celica, Pickup and 4-Runner, or 2500 RPM on all other models. Repeat blowing test. There should be strong resistance to air flow through modulator. If not, replace modulator. Reconnect vacuum hoses to proper locations.

BI-METALLIC VACUUM SWITCHING VALVE (BVSV)

1. Drain coolant and remove BVSV valve. Place sensing portion in cool water, but do not allow water into valve.
2. Cool BVSV to below 86°F (30°C). Blow air into top port and check that air does not escape through bottom port.
3. Heat BVSV to above 111°F (44°C). Blow air into top port and check that air escapes through bottom port.
4. Apply liquid sealer to threads of BVSV and reinstall. Fill radiator with coolant. If problem is found, replace BVSV.

Scheme 20

1. Connect battery voltage to VSV terminals. (Scheme 20) Blow air into port "E" (nearest valve) and check that air comes out port "F" (farthest from valve). Disconnect battery and repeat test. Air should come out front port ("G"). (Scheme 20): Vacuum Switching Valve (VSV) Test Connections
2. Using an ohmmeter, check that there is no continuity between positive terminal and body of VSV. Resistance between terminals should measure 38-43 ohms at 68°F (20°C). Replace valve if it does not meet specifications.

Scheme 21

1. Check and clean vacuum modulator filters with compressed air before proceeding with test. Using a 3-way connector, connect a vacuum gauge to the hose between EGR valve and EGR vacuum modulator.
2. Check seating of EGR valve by starting engine. Engine should start and run at idle.
3. Check BVSV with coolant temperature below 86°F (30°C). Vacuum gauge should indicate low vacuum at 2500 RPM. (Scheme 21): EGR System
4. Warm engine to normal operating temperature. Vacuum gauge should indicate low vacuum at 2500 RPM.
5. 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. 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.
6. With engine idling, apply vacuum directly to EGR valve. Engine should run rough or die. Remove vacuum and reconnect vacuum hoses to proper locations. Engine should run smooth. If no problem is found with this inspection, system is okay.
7. Check computer control of vacuum switching valve (VSV). Disconnect vacuum hoses from ports "E" and "F" of VSV. (Scheme 22) With engine idling, blow into port "F". The valve should close and not allow air to escape through port "E".
8. Increase engine speed to above 1500 RPM. Again blow into port and note that valve should open to allow air to escape from port "E". If no problem is found with this inspection, system is okay.

Checking Computer Control of VSV. Scheme 22