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 the port on one side with your finger.
- Blow air into another port, 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.