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EGR Vacuum Regulator Solenoid Inspection

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check EGR Vacuum Regulator (EGRVR) Solenoid Output By Applying Vacuum With Hand Pump -  Disconnect vacuum hoses from solenoid. Connect hand vacuum pump to port "A" of EGRVR solenoid. Plug port "B". Apply vacuum to port "A". If vacuum holds, go to next step. If vacuum does not hold, replace EGRVR solenoid.
    CAUTION: Never apply voltage to terminal "B". Diode in the solenoid may be damaged.
  2. Check EGRVR Solenoid Vacuum Output Capability -  Apply vacuum to port "A". Apply battery voltage to terminal "A" and ground terminal "B". If vacuum holds and releases when solenoid is energized, EGRVR is okay. If vacuum does not hold and release when solenoid is energized, replace EGRVR solenoid.
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