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Home >> Suzuki >> 1999 >> Grand Vitara JS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0440: Evaporative (EVAP) Control System Malfunction Or DTC P0455: Evaporative (EVAP) Control System Leak Detected >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Check evaporative canister purge valve and circuit operation. See EVAP CANISTER PURGE VALVE in SYSTEM & COMPONENT TESTING article. If canister purge valve operation is as specified, go to next step. If operation is not as specified, check for clogged vacuum passage. Clean or repair as necessary.
  2. Check evaporative canister air valve and circuit operation. See FUEL EVAPORATION in SYSTEM & COMPONENT TESTING article. If evaporative canister air valve operation is as specified, go to next step. If operation is not as specified, repair as necessary.
  3. Check fuel tank pressure control valve operation. See FUEL EVAPORATION in SYSTEM & COMPONENT TESTING article. If fuel tank pressure control valve operation is as specified, go to next step. If operation is not as specified, replace fuel tank pressure control valve. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
  4. Check fuel tank pressure control solenoid valve and circuit operation. See FUEL TANK PRESSURE CONTROL VALVE in SYSTEM & COMPONENT TESTING article. If fuel tank pressure solenoid valve operation is as specified, go to next step. If operation is not as specified, repair as necessary and retest system.
  5. Check evaporative canister for damage or clogged passages. See EVAP CANISTER in SYSTEM & COMPONENT TESTING article. If evaporative canister operation is as specified, go to next step. If operation is not as specified, replace evaporative canister. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
  6. Inspect purge line, evaporative system components and fuel tank for leaks. See FUEL EVAPORATION in SYSTEM & COMPONENT TESTING article. If any leaks are found, repair or replace system or components as necessary. If no leaks are found, go to next step.
  7. Check fuel tank pressure sensor operation. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. If fuel tank pressure sensor operation is not as specified, replace fuel tank pressure sensor. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system. If operation is as specified, replace PCM. See REMOVAL, OVERHAUL & INSTALLATION article. Retest system.
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