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EGR Modulator Valve: Non-Turbo

Remove EGR modulator valve. Connect vacuum pump to No. 1 port and plug No. 2 and No. 3 ports. See Fig 1 . Apply vacuum and blow into exhaust gas port. Ensure vacuum holds. Release exhaust gas port and ensure vacuum is released. Replace EGR modulator valve if defective.

Fig 1: EGR Modulator Valve Test
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