EGR Backpressure Transducer: Testing and Inspection

EGR VACUUM MODULATOR INSPECTION
1. DISCONNECT VACUUM HOSES FROM EGR VACUUM MODULATOR.
Disconnect these vacuum hoses:



1. Vacuum hose from P port.
2. Vacuum hose from Q port.
3. Vacuum hose from R port.

2. INSPECT EGR VACUUM MODULATOR OPERATION.



- Block ports P and R with your finger.
- Blow air into port Q.
- 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.
Connect these vacuum hoses:
- Vacuum hose to P port.
- Vacuum hose to Q port.
- Vacuum hose to R port.