LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0442: Evaporative Emission Control System - Small Leak Detected >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Inspect EVAP system for the following conditions:
    • A loose, missing, or damaged service port Schrader valve.
    • A loose, incorrect, missing, or damaged fuel fill cap.
    • A damaged EVAP canister purge solenoid.

    Raise vehicle on hoist. Inspect EVAP system for the following conditions:

    • Any disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses.
    • A damaged EVAP canister vent solenoid or EVAP canister.

    Did you find and correct the condition? If yes, go to step  5. If no, go to next step.

    3. NOTE: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. System flow will be less with higher temperatures.
  3. Turn ignition switch to OFF position. Connect the Evaporative Emissions System Tester (EEST) (J 41413-200), or equivalent, power supply clips to a known good 12-volt source. Install the Fuel Tank Cap Adapter (J 41415-40), or equivalent, to the fuel fill pipe. Connect the fuel fill cap to the fuel tank cap adapter. Connect the EEST nitrogen/smoke supply hose to the fuel tank cap adapter. Turn ignition switch to RUN position, engine OFF. Command the EVAP vent solenoid closed using a scan tool. Turn the nitrogen/smoke valve on the EEST control panel to SMOKE. Use the remote switch to introduce smoke into the EVAP system. Use the EVAP Service Port Vent Fitting (J 41413-VLV), or equivalent, to open the EVAP service port. Remove the EVAP service port vent fitting once smoke is observed. Continue to introduce smoke into the EVAP system for an additional 60 seconds. Inspect the entire EVAP system for exiting smoke using the High Intensity White Light (J 41413-SPT), or equivalent. Continue to introduce smoke at 15 second intervals until the leak source has been located. Did you locate and repair a leak source? If yes, go to step  5. If no, go to next step.
    4. NOTE: The following steps require EVAP Pressure/Purge Diagnostic Station (J 41413), and Fuel Tank Cap Adapter (J 41415-40).
  4. Disconnect the fuel tank cap adapter from the fuel fill pipe. Install the fuel fill cap to the fuel fill pipe. Connect the EEST nitrogen/smoke supply hose to the EVAP service port. Use the remote switch to introduce smoke into the EVAP system. Inspect the entire EVAP system for exiting smoke using the high intensity light. Continue to introduce smoke at 15 second intervals until the leak source has been located. Did you locate and repair a leak source? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
    5. NOTE: Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
  5. Turn the nitrogen/smoke valve to NITROGEN. Connect the nitrogen/smoke hose to the 0.20" (0.5 mm) test orifice on the bottom-front of the EEST. Use the remote switch to activate the EEST. Align the Red flag on the flow meter with the floating indicator. Use the remote switch to de-activate the EEST. Install the fuel tank cap adapter to the fuel fill pipe. Remove the nitrogen/smoke hose from the test orifice and install the hose onto the fuel tank cap adapter. Turn ignition switch to RUN position, engine OFF. Command the EVAP vent solenoid closed using a scan tool. Use the remote switch to introduce nitrogen and fill the EVAP system until the floating stabilizes. Compare the flow meter's stable floating indicator position to the Red flag. Is the floating indicator below the Red flag? If yes, go to next step. If no, go to  2.
  6. Using a scan tool, observe the CAPTURE INFO. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
scientia non olet · About LEMON Manuals