EGR Backpressure Transducer: Testing and Inspection

1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR.
Disconnect these vacuum hoses:





- Vacuum hose from R port.
- Vacuum hose from Q port.
- Vacuum hose from P port.
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 3,500 rpm.





- Repeat the above test. Check that there is a strong resistance to air flow.
3. RECONNECT VACUUM HOSES TO EGR VACUUM MODULATOR.
Connect these vacuum hoses:
- Vacuum hose to R port.
- Vacuum hose to Q port.
- Vacuum hose to P port.