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Fuel Evaporation

  1. Ensure engine coolant temperature is at least 176°F (80°C). Ensure oxygen sensor and fuel/ignition system is operating properly. Disconnect hose from fuel evaporative canister frequency solenoid valve (on left side of engine compartment firewall).
  2. Start engine and allow to idle. Valve must not operate, and no vacuum should be felt at valve connection. Increase engine speed. Valve must open and close, and vacuum must be felt at connection. If fuel evaporative canister frequency solenoid valve does not operate, perform OUTPUT DIAGNOSTIC TEST MODE. See the TESTS W/CODES article.
  3. Turn ignition off. Disconnect fuel evaporative canister frequency solenoid valve wiring harness connector. Using test leads from adapter kit, connect LED tester between wiring harness connector terminals. Start engine and increase engine speed.
  4. If LED tester flickers, replace fuel evaporative canister frequency solenoid valve. If LED tester does not flicker, check wiring harness for open circuit. If wiring harness is okay, replace Electronic Control Module (ECM).
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