EGR Vacuum Modulator

EGR vacuum modulator is a 3-port type.
Disconnect all hoses. Block ports "P" and "R". Apply air pressure to port "Q". See Fig 1. Air should pass through the air filter side of modulator freely.
Operate engine at specified RPM. See EGR VACUUM MODULATOR SPECIFICATIONS table. Repeat test procedures in steps 1) and 2). Strong resistance of airflow should be felt. Replace EGR vacuum modulator if resistance is not felt. Reconnect vacuum hoses to proper locations.

EGR VACUUM MODULATOR SPECIFICATIONS

Application	Engine RPM
3-Port Type	2500

Fig 1: Testing 3-Port Vacuum Modulator

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VACUUM SWITCHING VALVE (VSV) SPECIFICATIONS

Application

⁽¹⁾ Ohms

Tercel

37-44

⁽¹⁾	When measured at 68°F (20°C).