LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2003 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 581 (EGR Function Testing - TOYOTA) >> EGR Function Testing - TOYOTA >> Test 1 >> Single Diaphragm Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Single Diaphragm Valve

WARNING: This page does not describe the selected car, but rather 330 other vehicles, including the 2018 Toyota Camry, 2017 Toyota Prius V, 2017 Toyota Prius, 2017 Toyota Camry, and 2016 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check all vacuum hoses for correct routing. Warm engine to operating temperature. Disconnect vacuum hose from EGR valve.
  2. With engine at idle, apply intake manifold vacuum to EGR valve. On systems equipped with a modulator and/or auxiliary control valve, engine should run rough or carburetor should make bubbling noise.
  3. On systems not equipped with a modulator and/or auxiliary control valve, increase engine speed to 3000-3500 RPM. Carburetor should make bubbling noise. If bubbling noise is not heard, check other EGR system controls. See appropriate article.
scientia non olet · About LEMON Manuals