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Diagnosis & Repair (Using OBD-II Scan Tool)

  1. Turn ignition off. Disconnect EVAP VSV connector. VSV is located at left rear of engine, below intake manifold. Using ohmmeter, measure resistance between valve terminals. If resistance is 27-33 ohms at 68°F (20°C), go to next step. If resistance is not 27-33 ohms, replace VSV. See Figure.
  2. Check for continuity between each valve terminal and valve body. If continuity exists, replace VSV. If continuity does not exist, connect battery voltage to valve connector terminals. Apply air pressure to VSV port "E". Air from port "E" should flow from port "F". Remove battery voltage. Air from port "E" should not flow from port "F". If VSV does not operate as specified, replace VSV. If VSV operates as specified, go to next step.
  3. Access ECM behind glove box. Connect Check Harness "A" (SST 09990-01000) to ECM. See TEST PREPARATION  under SELF-DIAGNOSTIC SYSTEM. Turn ignition on. Measure voltage between ground and terminal No. 74 at Check Harness "B" connector. See Figure. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, repair open or short circuit in wiring harness. See appropriate wiring diagram in WIRING DIAGRAMS - NON-TURBO article.
  4. Check vacuum hose connections and correct routing. See appropriate illustration in VACUUM DIAGRAMS - NON-TURBO article. Repair vacuum hoses as necessary. If vacuum hoses are okay, check charcoal canister. See SYSTEM/COMPONENT TESTS - NON-TURBO article. Replace charcoal canister as necessary.
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