EGR Backpressure Transducer: Testing and Inspection

EGR VACUUM MODULATOR 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.





- Block port P 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.
- Reconnect the 2 vacuum hoses to the proper locations.