Diagnosis & Repair (Using Lexus Scan Tester)
- Connect Lexus scan tester to Data Link Connector (DLC) No. 3. Turn ignition and scan tester on. Using scan tester, select ACTIVE TEST mode. Check operation of EVAP VSV when activated by scan tester. For VSV location, see VACUUM DIAGRAMS article.
- With EVAP VSV on, air from port "E" should exhaust out port "F". See Fig 1. With EVAP VSV off, air should not exhaust out port "F". If VSV operates as specified, go to step 5). If VSV does not operate as specified, go to next step.
- Remove EVAP VSV. Using ohmmeter, measure resistance between VSV terminals. With VSV temperature at 68°F (20°C), resistance should be 30-34 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.
- Using jumper wires, apply battery voltage to VSV terminals. Air from port "E" should exhaust out pipe "F". See Fig 1. Disconnect jumper wires. Air should not exhaust out 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 is okay, replace ECM and retest.
- Check VSV vacuum hose connections. Repair as necessary. If hose connections are okay, check charcoal canister. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. Replace as necessary.
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