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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 765 (Emission System) >> Purge Solenoid Valve Inspection >> Evaporative Purge Control Inspection >> Using WDS or equivalent

Using WDS or equivalent

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the WDS or equivalent to the DLC-2.
  2. Warm up the engine and idle it.
  3. Disconnect the vacuum hose which is connected to the charcoal canister from purge solenoid valve.
    Fig 1: Locating Data Link Connector (DLC-2)
    G00973050Courtesy of MAZDA MOTORS CORP.
  4. Place your finger onto the evaporative hose as shown in the figure and verify that vacuum is applied.
    Fig 2: Checking Vacuum In Evaporative Hose
    G00973051Courtesy of MAZDA MOTORS CORP.
    • If vacuum is not applied, inspect the following:
      • PID: EVAPCP
      • Purge solenoid valve airflow
  5. Disconnect the vacuum hose.
  6. Using the "EVAPCP" simulation function, set the present 0%  duty value of the purge solenoid valve to the 100%  duty value and verify that he engine idles roughly or stalls.
    • If the idle status does not change, inspect the following:
      1. Turn the ignition switch to the ON position.
      2. Using the "EVAPCP" simulation function, set the present 0%  duty value of the purge solenoid valve to the 50%  duty value and verify purge solenoid valve operation sound.
        • If the operation sound is verified, inspect the following:
          • Disconnection and damage of the vacuum hose (intake manifold-purge solenoid valve-charcoal canister)
        • If the operation sound is not verified, inspect the following:
          • Purge solenoid valve airflow
          • Wiring harness and connector open circuit (main relay-purge solenoid valve-PCM)
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