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EGR Vacuum Modulator

NOTE: When testing EGR vacuum modulator, it may be necessary to monitor engine RPM by using tachometer or scan tester depending on model application. For tachometer or scan tester connections, see IDLE SPEED & MIXTURE in ADJUSTMENTS article.
  1. Disconnect the 2 vacuum hoses from EGR vacuum modulator. Plug vacuum hose connection on EGR vacuum modulator that goes to the EGR VSV. This is the vacuum hose connection opposite EGR valve vacuum hose connection on EGR vacuum modulator.
  2. Apply air pressure on EGR valve vacuum hose connection on EGR vacuum modulator. Air should flow freely through air filter side of EGR vacuum modulator.
  3. Start and operate engine at specified RPM. See EGR VACUUM MODULATOR TESTING 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 TESTING SPECIFICATIONS

Application Engine RPM
Supra 3500
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