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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P1441: EVAP System Flow During Non-Purge >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic II OBD-II system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Turn ignition on, engine off. Remove gas cap. Using scan tool, read FUEL TANK PRESSURE. If scan tool displays 1.51 volts, go to next step. If scan does not display 1.51 volts, go to DTC P0440: EVAP SYSTEM MALFUNCTION .
  3. Reinstall gas cap. Disconnect rubber hose at vapor canister that goes to purge solenoid valve. Connect EVAP Diagnostic Station (J41413) or equivalent. Using scan tool, command EVAP vent solenoid ON (closed). Pressurize EVAP system until scan tool FUEL TANK PRESSURE reads 1.52-1.60 volts. If FUEL TANK PRESSURE holds specified value, go to next step. If FUEL TANK PRESSURE does not hold specified value, go to step  6.
  4. Disconnect EVAP Diagnostic Station (J41413) and plug hose end. Disconnect rubber hose at vacuum source. Connect a vacuum pump to hose. Apply 15 inches of H2 O. Observe FUEL TANK PRESSURE on scan tool. If FUEL TANK PRESSURE reading holds between 1.47-1.51 volts, go to step  6. If FUEL TANK PRESSURE does not hold at specified value, go to next step.
  5. Replace EVAP purge solenoid valve. Retest system.
  6. Check for leaking, kinked or pinched EVAP system hoses. Ensure hoses are routed properly. Check for leaking Vent Solenoid Valve or clogged filter. Repair any problems found. If no problems were found, go to next step.
  7. Start engine. Remove fuel filler cap. Using scan tool, command EVAP vent solenoid ON (closed) and EVAP purge solenoid OFF (0%). Replace fuel filler cap. Run engine at 2500 RPM while monitoring FUEL TANK VACUUM on scan tool. If reading remains at 30-40 percent, repair is complete. If reading does not maintain as specified, go to DIAGNOSTIC AIDS .
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