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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Engine Control System & Component Testing - 4-Cylinder) >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION System >> EGR Vacuum Modulator (Tacoma 2.7L 3RZ-FE)
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EGR Vacuum Modulator (Tacoma 2.7L 3RZ-FE)

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tacoma, 2002 Toyota RAV4, 2002 Toyota Prius, 2002 Toyota MR2, and 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. When testing EGR vacuum modulator, it may be necessary to monitor engine RPM by using Toyota hand-held tester or scan tool. Toyota hand-held tester or scan tool may be connected to data link connector No. 3 at driver's side of instrument panel for monitoring engine RPM. See Figure.
  2. Mark vacuum hose locations and disconnect vacuum hoses from EGR vacuum modulator. See Figure.
  3. Block ports "P" and "R" on EGR vacuum modulator. See Figure. Ports "P" and "R" are the double ports on side of EGR vacuum modulator. Port "Q" is single port on side of EGR vacuum modulator.
  4. Apply air pressure to port "Q". See Figure. Air should flow freely through air filter side of EGR vacuum modulator.
  5. Start engine and operate engine at 3500 RPM. Repeat test procedures in steps  3 and  4. Strong resistance of airflow should be felt with engine at specified RPM. Replace EGR vacuum modulator if strong resistance is not felt. Reconnect vacuum hoses to proper locations.
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