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Diagnosis & Repair (Using Lexus Scan Tool)

  1. Connect Lexus scan tool to Data Link Connector (DLC) No. 3. See Figure. Turn ignition on. Using scan tool, select ACTIVE TEST mode. Check operation of EVAP VSV when activated by scan tool. For VSV location, see VACUUM DIAGRAMS article.
  2. Start and run engine. With EVAP VSV on, air from port "E" should flow from port "F". See Figure. With EVAP VSV off, air should not flow from port "F". If VSV operates as specified, go to step 5). If VSV does not operate as specified, go to next step.
  3. Remove EVAP VSV. Using ohmmeter, measure resistance between VSV terminals. With VSV temperature at 68°F (20°C), resistance should be 27-33 ohms. Measure resistance between each terminal and body of valve. Resistance should be infinite. If resistance is as specified, go to next step. If resistance is not as specified, replace VSV.
  4. Using jumper wires, apply battery voltage to VSV terminals. Apply air pressure to VSV port "E". Air should flow from port "F". See Figure. Disconnect jumper wires. Air should not flow from port "F". If VSV does not operate as specified, replace VSV. If VSV operates as specified, check for open or short circuit in wiring harness between EFI main relay and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If wiring harness is okay, replace ECM and retest.
  5. Check VSV vacuum hose connections. Repair as necessary. If hose connections are okay, check charcoal canister. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article. Replace as necessary.
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