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Home >> Mazda >> 1994 >> B2300 SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> EGR (CALIFORNIA) >> System Check
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System Check

  1. Check all connectors and hose routings. Check for cracks, leakage and restrictions, and repair as necessary. Start engine, and ensure diaphragm of EGR control valve does not move while engine is cold. Warm engine to operating temperature and allow it to idle.
  2. Disconnect vacuum hose at EGR control valve. See Figure. Ensure less than 1 in. Hg is present. If specified amount of vacuum is present, check EGR control valve. If specified amount of vacuum is not present, test EGR components as necessary.
NOTE: Most EGR problems should set a trouble code in computer memory. For computer control testing of EGR components, see CIRCUIT TEST DL in TESTS W/CODES articles in the ENGINE PERFORMANCE section.
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