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EGR Valve - Miata, MPV, Protege & 626

WARNING: This page is about a different car, the 2001 Mazda Protege, 2001 Mazda Millenia, 2001 Mazda MX-5 Miata, 2001 Mazda MPV, and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using a stethoscope, listen for EGR valve initialization noise (clicks) when starting and stopping engine. If clicking noise is heard, EGR valve is functioning properly. If clicking noise is not heard, go to next step.
  2. Turn ignition off. Disconnect EGR valve connector. Using an ohmmeter, measure resistance between EGR valve terminals "C" and "E", "C" and "A", "D" and "B" and between "D" and "F". See Fig 1 . Each resistance reading should be about 22 ohms. On Protege, resistance reading should be 20-24 ohms.
  3. If resistance is as specified, check wiring harness between EGR valve and PCM. See WIRING DIAGRAMS article. If resistance is not as specified, replace EGR valve.
Fig 1: Identifying EGR Valve Terminals (Miata & Protege)
G97F07730Courtesy of MAZDA MOTORS CORP.
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