EGR Backpressure Transducer: Testing and Inspection

Exhaust Gas Recirculation (EGR) Back Pressure Transducer Inspection

Tools Required
J23738-A Hand Vacuum Pump




1. Check the filter (1) for any contamination and damage. Clean the filter with compressed air.
2. Remove the three vacuum hoses from the Exhaust Gas Recirculation (EGR) back pressure transducer.




3. Place one finger over the vacuum tube of the EGR back pressure transducer (1).
4. Blow air (2) into the opposite tube. Air should pass through the filter part of the pressure transducer.




5. Connect a hand vacuum pump to tube P (1) and plug tube O (2) with your finger.
6. Blow air (3) into tube A (4) while applying vacuum to tube P (1) at the same time. You should be able to obtain vacuum on the vacuum pump gauge.
7. Stop blowing air into tube A (4). The vacuum pump gauge should read zero.

Replace the EGR back pressure transducer if the transducer fails either test. Refer to EGR Back Pressure Transducer Replacement.