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LEMON is the spiritual successor to CHARM, I recommend you try it!

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EGR Backpressure Transducer: Testing and Inspection

EGR Pressure Transducer Filter:

EGR Modulator Test:
Inspect filter for contamination before proceeding.

1. Remove EGR modulator and plug nozzle with your finger. Blow air into another nozzle and check that air passes through to air filter side freely.

2. Install vacuum pump to nozzle "P" and plug nozzle "Q" with your finger. While blowing air into nozzle "A," operate vacuum pump and check that vacuum is applied to modulator.