EGR Backpressure Transducer: Testing and Inspection

INSPECTION

1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR
Disconnect the 2 vacuum hoses from ports P and Q of the EGR vacuum modulator.
2. INSPECT EGR VACUUM MODULATOR OPERATION
(a) Block port P with your finger.





(b) Blow air into port Q, and check that air passes through to the air filter side freely.





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