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 R port
(2) Vacuum hose from Q port
(3) Vacuum hose from P port
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.
If operation is not as specified, replace the EGR vacuum modulator.
3. Reconnect vacuum hoses to EGR vacuum modulator.




Connect these vacuum hoses:
(1) Vacuum hose to R port
(2) Vacuum hose to Q port
(3) Vacuum hose to P port