EGR Backpressure Transducer: Testing and Inspection

1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR.
2. INSPECT EGR VACUUM MODULATOR OPERATION.
- Block ports P and R with your finger.
- Blow air into port Q, and check that the air passes through to the air filter side freely.





- Start the engine, and maintain speed at 3,000 rpm.
- Repeat the above test.
- Check that there is a strong resistance to air flow.
- If operation is not as specified, replace the EGR vacuum modulator.
3. RECONNECT VACUUM HOSES TO EGR VACUUM MODULATOR.