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Home >> Mazda >> 2002 >> Tribute ES, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> EGR >> EGR Valve
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EGR Valve

  1. Ensure all vacuum hoses are correctly routed and securely attached. Replace any crimped or broken hoses. Ensure there is less than one in. Hg vacuum to EGR valve at idle with engine at normal operating temperature.
  2. Remove and plug vacuum hose at EGR valve. Connect scan tool to DLC. Access DPFEGR and RPM PIDs. Place transmission in Neutral. Start and operate engine at idle. Note idle speed. Using a hand-held vacuum pump, slowly apply 8-10 in. Hg vacuum to EGR valve for 10 seconds. If engine starts to stall, increase RPM to maintain 1000 RPM. Look for following:
    • EGR valve starts opening at about 1.6 in. Hg vacuum indicated by increasing DPFEGR PID voltage.
    • DPFEGR PID voltage increasing until EGR valve is fully open. DPFEGR PID voltage should read 2.5 volts minimum with full vacuum applied.
    • DPFEGR PID voltage steady when vacuum is held. If voltage drops within a few seconds, the EGR valve or vacuum source could be leaking.
  3. Service or replace EGR valve if engine does not stall or idle speed does not respond as specified. Unplug and reconnect vacuum hose at EGR valve. For additional EGR system testing, go to appropriate SELF-DIAGNOSTICS article.
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