Passport 4WD V6-3.2L SOHC (6VD1) (1994)
EGR Backpressure Transducer: Testing and Inspection
1. Remove Vacuum Hoses (3) from Modulator.
2. Place finger over Back Pressure Transducer Tube "Vacuum Switch Valve (VSV)" and blow in tube "Exhaust Gas Recirculation (EGR) Valve. Air
should pass through filter part of Back Pressure Transducer.
3. Connect Vacuum Pump to tube "VSV" and plug tube "EGR Valve".
4. Blow air into Tube "S". Should be able to obtain vacuum on Pump.
5. If EGR Modulator fails this test, replace Back Pressure Transducer.