EGR Backpressure Transducer: Testing and Inspection

INSPECTION

1. Warm engine up to operating temperature. Turn engine off. Disconnect the vacuum hoses from ports P, Q and R of the Exhaust Gas Recirculation Vacuum Modulator.
2. Plug ports P and R with your finger.
3. Blow air into port Q. Check that the air passes through to the air filter side freely.
4. Start the engine and maintain speed at 2,5OOrpm.
5. Repeat the above test. Check that there is a strong resistance to air flow.
6. Reconnect the vacuum hoses to the proper locations. If a problem is found, replace the Vacuum Modulator.