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.