EGR System: Cressida
- Disconnect vacuum hose from EGR valve "A" and connect a vacuum gauge to it. Disconnect and plug vacuum hose from VCV port "S".
- Start engine and run at idle speed. With coolant temperature below 122°F (50°C), vacuum gauge should indicate zero at 2000 RPM. As engine warms up, vacuum gauge should indicate high vacuum. If not, check BVSV and modulator.
- Maintain engine speed at 2000 RPM. Reconnect hose to VCV port "S". Check that vacuum gauge indicates zero for 25-40 seconds. If not, check VCV. Remove gauge and reconnect hoses.
- Stop engine and remove EGR modulator. Plug the gas hose from EGR valve to modulator. Start engine and race it once, then apply vacuum directly to EGR valve with engine idling. Engine should idle rough or die. If not, check EGR valve or passage.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002