EGR Modulator Valve (2.0L)

Remove EGR modulator valve. Plug port No. 3, and connect a vacuum pump to port No. 1. See Figure and Fig 1 . Blow into exhaust gas port. Operate vacuum pump and verify vacuum is held. Release exhaust port and verify vacuum is released. Replace EGR modulator valve if it does not test as described.

Fig 1: Testing EGR Modulator Valve (2.0L)

Courtesy of MAZDA MOTORS CORP.