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Home >> Oldsmobile >> 2000 >> Silhouette GLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0442: Evaporative Emission Control System - Small Leak Detected >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check if any other DTCs are set. Diagnose affected DTC(s). If no other DTC(s) are set, go to next step.
  3. Check for improperly routed, kinked or damaged EVAP system purge or vapor lines. Check for loose, incorrect or defective fuel filler cap. Check for loose, missing or damaged service port dust cap and/or Schrader valve. Check for damaged EVAP system component(s). Repair as necessary. After repairs, go to step  14. If no problems were found, go to next step.
  4. Turn ignition on, with engine off. Using scan tool, observe fuel tank pressure parameter. If fuel tank pressure is about zero in. H2O, go to next step. If fuel tank pressure is not about zero in. H2O, go to DTC P0453: FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE .
  5. Install Fuel Tank Cap Adaptor (J-41415-40) to fuel filler neck and fuel filler cap. Connect EVAP Pressure/Purge Diagnostic Station (J-41413) to fuel tank cap adaptor. Turn ignition on, with engine off. Using scan tool, capture FAILURE RECORD data for this DTC and clear DTCs. Select seal option to seal EVAP system. Attempt to pressurize system to 5 in. H2O by slowly turning EVAP diagnostic station rotary switch to PRESSURE position. Observe scan tool. If fuel tank pressure is about 5 in. H2O, go to next step. If fuel tank pressure is not about 5 in. H2O, go to DTC P0452: FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE .
  6. Using scan tool, perform SERVICE BAY TEST for EVAP system. If scan tool indicates that system passed the test, see DIAGNOSTIC AIDS . If scan tool does not indicate that the system passed the test, go to next step.
  7. Disconnect fuel tank vapor line and EVAP purge line from EVAP canister. Block canister fitting for fuel tank pressure line. Connect a hand-held vacuum pump to canister fitting for EVAP purge line. Ensure that EVAP vent solenoid is still commanded on. Apply vacuum to EVAP canister. If vacuum can be maintained at 5 in. Hg, go to step  10. If vacuum cannot be maintained at 5 in. Hg, go to next step.
  8. Disconnect vent hose from vent valve and plug vent hose. Using a hand-held vacuum pump, apply 5 in. Hg vacuum. If vacuum can be maintained, go to next step. If vacuum cannot be maintained, go to step  13.
  9. Disconnect vent hose from EVAP canister and plug vent port. Apply 5 in. Hg vacuum. If vacuum can be maintained, go to step  11. If vacuum cannot be maintained, go to step  12.
  10. Reconnect all previously disconnected hardware. Using scan tool, seal EVAP system. Using EVAP service diagnostic station, pressurize EVAP system to 15 in. Hg. Using Ultrasonic Leak Detector (J-41416), locate leaks in fuel sender "O" ring, fuel tank, fuel tank relief valve, EVAP pipes/hoses, filler cap, and fuel filler neck and seal. Repair as necessary. After repairs, go to step  14.
  11. Replace EVAP canister. After replacing EVAP canister, go to step  14.
  12. Replace EVAP fresh air hose. After replacing hose, go to step  14.
  13. Replace EVAP vent valve. After replacing vent valve, go to next step.
  14. Reconnect all EVAP hardware that was previously disconnected. Turn ignition on, with engine off. Using scan tool, select seal EVAP system. Using EVAP diagnostic station, pressurize system to 15 in. Hg. Move rotary switch in diagnostic station to OFF/HOLD position and observe EVAP pressure gauge. If EVAP pressure decreases to less than 10 in. Hg within 2 minutes, repeat step  3. If EVAP pressure does not decrease to less than 10 in. Hg, system is okay.
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