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Sensor Contamination Inspection

  1. Visually/physically inspect following items:
    1. Remove and inspect the HO2S(B1S1) for any silicon contamination. This contamination will be indicated by a white powdery coating and this will result in a but false voltage signal.
    2. Check MAFS for contamination, deterioration, or damage.
    3. If contamination is evident on the HO2S or MAFS, replace contaminated sensor and go to next step.
  2. OVER PURGING OF THE EVAP SYSTEM  Check the EVAP. system for possible leaks.
    1. Remove the manifold side vacuum hose from the EVAP canister purge valve.
    2. Using a hand vacuum pump apply specified vacuum(Approx. 15 in, Hg) to the manifold side of the valve.
    3. Does the valve hold vacuum?

      YES 

      NO 

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