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Home >> Mitsubishi >> 1995 >> Eclipse RS, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L Turbo >> Diagnostic Tests >> Code P0440: EVAP Control System Fault
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Code P0440: EVAP Control System Fault

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  in this article. For appropriate WIRING DIAGRAMS, see WIRING DIAGRAMS  section.
  1. Disconnect Red-stripe vacuum hose from throttle body. Plug throttle body nipple and connect hose to hand vacuum pump. Apply 16 in. Hg of vacuum. Start engine and increase to 3000 RPM. If coolant temperature is 104°F (40°C) or less, vacuum should hold. If coolant temperature is 176°F (80°C) or more, vacuum should bleed off.
  2. Reconnect Red-stripe vacuum hose. Disconnect purge air hose from air inlet duct. Plug inlet duct nipple and connect purge hose to hand vacuum pump. Apply 16 in. Hg of vacuum. Ensure coolant temperature is 176°F (80°C) or more. With engine at idle, vacuum should hold. When throttle is opened quickly, vacuum should bleed off.
  3. If vacuum is not as specified, go to step  4 . If vacuum is as specified, disconnect vacuum hose from throttle body purge vacuum nipple. Connect hand vacuum pump to nipple. Start engine and gradually increase RPM. Vacuum reading should remain constant as RPM increases. If vacuum is as specified, check vapor hose between fuel tank and evaporative emission canister. If no vacuum exists, check throttle body purge port.
  4. Disconnect vacuum hose from throttle body purge vacuum nipple. Connect hand vacuum pump to nipple. Start engine and gradually increase RPM. Vacuum reading should remain constant as RPM increases. If vacuum is as specified, remove purge control valve.
  5. Using hand vacuum pump apply 16 in. Hg of vacuum to purge control valve diaphragm nipple. Vacuum should hold. Valve should begin opening at approximately 8 in. Hg. Observe operation of valve through by-pass opening. Apply 16 in. Hg of vacuum to positive pressure nipple of purge control valve. Vacuum should hold. If purge port vacuum and purge control valve are okay, check purge control valve circuit. See CODE P0443: EVAP CONTROL SYSTEM PURGE CONTROL VALVE CKT FAULT  .
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