EGR Backpressure Transducer: Testing and Inspection

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



(1) Vacuum hose from P port
(2) Vacuum hose from Q port
(3) Vacuum hose from R 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:



(1) Vacuum hose to P port
(2) Vacuum hose to Q port
(3) Vacuum hose to R port