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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 330 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0442: EVAP System - Small Leak Detected >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS .
  2. Inspect the Evaporative Emission (EVAP) System for loose, missing, or damaged service port dust cap and/or Schrader valve. Check for loose, incorrect, missing, or damaged fuel fill cap. Check for damaged EVAP purge solenoid. Raise vehicle on a hoist. Inspect the EVAP system for disconnected, improperly routed, kinked, or damaged EVAP pipes and hose, damaged EVAP 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 off. Connect the Evaporative Emissions System Tester (J-41413-200) power supply clips to a known-good 12-volt source. Install the Fuel Tank Cap Adapter (J-41415-40) to the fuel fill pipe. Connect the Nitrogen/Smoke Supply Hose (J-41413-200). Turn ignition on, with engine off. Command the EVAP vent solenoid closed with a scan tool. Turn the nitrogen/smoke valve on the J-41413-200 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) to open the EVAP service port. Remove J-41413-VLV 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 with the High Intensity White Light (J-41413-SPT). 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. Disconnect the J-41415-40 from the fuel fill pipe. Install the fuel fill cap to the fuel fill pipe. Connect the 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 with the J-41413-SPT. 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, see 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 J-41413-200. Use the remote switch to activate the J-41413-200. Align the Red flag on the flow meter with the floating indicator. Use the remote switch to de-activate the J-41413-200. Install the J-41415-40 to the fuel fill pipe. Remove the nitrogen/smoke hose from the test orifice and install the hose onto the J-41415-40. Turn ignition on, with engine off. Command the EVAP vent solenoid closed with 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 step  2.
  6. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, diagnose affected DTC(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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