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Home >> Volkswagen >> 1997 >> Passat GLX, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 2.8L >> Emission Systems & Sub-Systems >> Fuel Evaporation
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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 operating properly. Disconnect hose from fuel evaporative canister regulator solenoid valve (on left side of engine compartment firewall).
  2. Start engine and allow to idle. No vacuum should be felt at valve connection. Increase engine speed. Vacuum must be felt at connection. If fuel evaporative canister regulator solenoid valve does not operate, perform OUTPUT DIAGNOSTIC TEST MODE. See TESTS W/CODES - 2.8L article.
  3. Turn ignition off. Disconnect fuel evaporative canister regulator 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 regulator 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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