EGR Backpressure Transducer: Testing and Inspection

EGR VACUUM MODULATOR INSPECTION
1. Disconnect vacuum hoses from Exhaust Gas Recirculation (EGR) vacuum modulator.
- Disconnect the 3 vacuum hoses from ports P, 0 and R of the EGR vacuum modulator.
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 2,500 rpm.
- Repeat the above test. Check that there is a strong resistance to air flow.
3. Reconnect vacuum hoses to EGR vacuum modulator.
- Connect the 3 vacuum hoses to the proper locations.