EGR Backpressure Transducer: Testing and Inspection

Checking EGR Modulator Filter:

- Check filter for contamination and damage. Using compressed air, clean filter.

Checking EGR Modulator:

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

Checking EGR Modulator:

- Connect vacuum pump gauge to nozzle "P" and plug nozzle "Q" with finger. While blowing air into nozzle "A", operate vacuum pump gauge and check that vacuum is applied to modulator. Then stop blowing nozzle "A" and check that vacuum pump gauge indicates "0" (zero). If check result is not satisfactory, replace EGR modulator.

- After checking, install modulator and connect hoses securely.