EGR Backpressure Transducer: Testing and Inspection

EGR VACUUM MODULATOR INSPECTION

1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR
Disconnect the 3 vacuum hoses from ports P, Q and R of the EGR vacuum modulator.
2. INSPECT EGR VACUUM MODULATOR OPERATION





(a) Block ports P and R with your finger.
(b) Blow air into port Q, and check that the air passes through to the air filter side freely.





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