EGR Backpressure Transducer: Testing and Inspection

PROCEDURE

1. Inspect Exhaust Gas Recirculation (EGR) Vacuum Modulator operation.
- Disconnect the vacuum hoses from ports P, Q, and R of the EGR Vacuum Modulator.



- 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.
2. Reconnect vacuum hoses to EGR Vacuum Modulator.