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Home >> Toyota >> 2000 >> 4Runner Base, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System & Component Testing - 4-Cylinder >> Emission Systems & Sub-Systems >> EGR Vacuum Modulator >> Camry CNG & Gasoline Models, Camry Solara, RAV4, Tacoma 2.4L 2RZ-FE Except Calif. Emission Vehicles, Tacoma 2.7L 3RZ-FE & 4Runner

Camry CNG & Gasoline Models, Camry Solara, RAV4, Tacoma 2.4L 2RZ-FE Except Calif. Emission Vehicles, Tacoma 2.7L 3RZ-FE & 4Runner

  1. Mark vacuum hose locations and disconnect vacuum hoses from EGR vacuum modulator. See Figure, Figure, Figure and Figure . 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.
  2. Apply air pressure to port "Q". See Figure. Air should flow freely through air filter side of EGR vacuum modulator.
  3. Start engine 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 with engine at specified RPM. Replace EGR vacuum modulator if strong resistance is not felt. Reconnect vacuum hoses to proper locations.
EGR VACUUM MODULATOR TESTING SPECIFICATIONS

Application Engine RPM
Camry CNG & Gasoline Models, Camry Solara & RAV4 2500
Tacoma & 4Runner 3500
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