Exhaust Gas RECIRCULATION (EGR) System Test

NOTE: EGR systems contain different components depending on application. See Fig 1. When testing EGR system and components, use proper illustration to determine component location.

NOTE: When performing EGR system test, it may be necessary to monitor engine RPM by using scan tool. For scan tool connections, see IDLE SPEED & MIXTURE in ADJUSTMENTS article.

Fig 1: Identifying Emission System Components

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