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EVAP Control System Diagnosis (2.2L)

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing powertrain diagnostic system check, go to next step.
  2. Install scan tool. Turn ignition on with engine off. Retrieve DTCs. If no DTCs are set, go to next step. If any DTCs are set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
  3. Using scan tool, command EVAP purge solenoid valve and EVAP canister vent solenoid valve on and off. If both purge solenoid valve and canister vent solenoid valve click when toggled on and off, go to next step. If either purge solenoid valve or vent solenoid valve do not click when toggled on and off, perform PCM output diagnosis. See PCM OUTPUT DIAGNOSIS (2.2L)  under COMPUTERIZED ENGINE CONTROLS.
  4. Remove fuel cap. Using scan tool, observe fuel tank pressure. If scan tool displays -1.28-1.28 in. H2 O, go to next step. If scan tool does not display -1.28 to 1.28 H2 O, perform DTC P0452 or DTC P0453 test. See appropriate SELF-DIAGNOSTICS article.
  5. Reinstall fuel cap. Install EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP service port and zero gauges. Using scan tool, command EVAP canister vent solenoid valve on. Using diagnostic station, pressurize EVAP system to 5 in. H2 O. Using scan tool, observe fuel tank pressure. If scan tool displays 3.85-8.99 in. H2 O, go to next step. If scan tool does not display 3.85-8.99 in. H2 O, perform DTC P0452 or DTC P0453 test. See appropriate SELF-DIAGNOSTICS article.
  6. Observe EVAP system pressure on diagnostic station. Using scan tool, command EVAP canister vent solenoid valve off. If EVAP system pressure decreases to zero in. H2 O within 5 seconds, go to next step. If EVAP system pressure does not decrease to zero in. H2 O within 5 seconds, perform DTC P0446 test. See appropriate SELF-DIAGNOSTICS article.
  7. Start engine. Remove fuel cap. Using scan tool, select EVAP PURGE/SEAL and seal EVAP system. Using diagnostic station, attempt to pressurize EVAP system to 5 in. H2 O. If fuel tank pressure does not decrease, go to next step. If fuel tank pressure is decreasing, perform DTC P1441 test. See appropriate SELF-DIAGNOSTICS article.
  8. Using scan tool, command EVAP canister vent solenoid valve and EVAP purge solenoid valve on. Increase engine speed to 1500 RPM. Using scan tool, observe fuel tank pressure. If fuel tank pressure is decreasing, system is okay. If fuel tank pressure does not decrease, perform DTC P0440 test. See appropriate SELF-DIAGNOSTICS article.
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