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Diagnosis & Repair (Using OBD-II Scan Tool)

  1. Check all EGR system vacuum hoses. See VACUUM DIAGRAMS article. If problem exists, repair as necessary. If problem does not exist, go to next step.
  2. Disconnect vacuum hoses from EGR VSV. Using Toyota hand-held tester, select ACTIVE TEST mode. Check operation of EGR VSV when activated by hand-held tester. EGR VSV is located under "V" bank cover on top of engine. With EGR VSV off, air applied to port "E" should flow from port "G". See Figure. With EGR VSV on, air applied to port "E" should flow from port "F". If EGR VSV operates as specified, go to step  5. If EGR VSV does not operate as specified, go to next step.
  3. Remove EGR VSV. Measure resistance between EGR VSV terminals (component side). Resistance should be 27-33 ohms at 68°F (20°C). Measure resistance between each terminal and body of EGR VSV (component side). Resistance should be infinite. If resistances are not as specified, replace EGR VSV. If resistances are as specified, go to next step.
  4. Check for open in EGR VSV circuits between engine compartment fuse block and ECM. See WIRING DIAGRAMS article. Repair as necessary. If circuits are okay, repair or replace ECM.
  5. Check EGR position sensor and EGR VCV. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If problem exists, repair as necessary. If problem does not exist, go to next step.
  6. Disconnect vacuum hose from EGR valve. Start engine and let idle. Apply vacuum to EGR valve. If engine does not run rough or stall, replace EGR valve or clean EGR passage. If engine runs rough or stalls, go to next step.
    7. NOTE: EGR position sensor is an integral part of EGR valve.
  7. Check EGR position sensor. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article. If problem exists, repair or replace EGR valve as necessary. If problem does not exist, replace ECM.
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