EGR Backpressure Transducer: Testing and Inspection

1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR
- Disconnect the 3 vacuum hoses from ports P, 0 and R of the EGR vacuum modulator.
2. INSPECT EGR VACUUM MODULATOR OPERATION
- Block ports P and R with your finger.
- Blow air into port 0. and check that the air passes through to the air filter side freely.





- Start the engine, and maintain speed at 2,500 rpm.
- Repeat the above test.
- Check that there is a strong resistance to air flow.
3. RECONNECT VACUUM HOSES TO EGR VACUUM MODULATOR
- Connect the 3 vacuum hoses to the proper locations