LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2003 >> Matrix XR, FWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - 4-Cylinder >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION System >> EGR Vacuum Modulator (Tacoma)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

EGR Vacuum Modulator (Tacoma)

  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 located at driver's side of instrument panel for monitoring engine RPM. See Figure.
  2. Locate EGR vacuum modulator and mark vacuum hose locations and disconnect vacuum hoses from EGR vacuum modulator. See Figure and 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.
scientia non olet · About LEMON Manuals