Exhaust Gas Recirculation (EGR) System Check
EGR TEST1. Run engine to normal operating temperature 60°C (140°F).
2. Place a finger on the EGR valve diaphragm and accelerate engine, diaphragm should move.
3. If diaphragm doesn't move, disconnect vacuum hose from EGR valve and plug.
4. Using a vacuum pump, apply 10" inches of vacuum to the valve with a finger on the diaphragm. It should move and the engine may stall.
5. If valve fails, replace valve.
EGR Modulator Checks:
EGR BACKPRESSURE TRANSDUCER TEST
1. Remove (3) vacuum hoses from modulator.
2. Place finger over "VSV" tube and blow in "EGRV" tube. Air should pass through filter part of transducer.
3. Connect vacuum pump to "VSV" and plug tube "EGRV" with a cap or your finger.
4. Blow air into Tube "S" You should not be able to obtain a vacuum on the pump.
5. If EGR transducer fails this test, replace transducer.
VSV Solenoid:
EGR ELECTRONIC VACUUM REGULATING SOLENOID VALVE (EVRV) TEST
1. Turn ignition switch "OFF."
2. Disconnect vacuum hoses from solenoid.
3. Disconnect electrical connector.
3. Using a digital ohm meter, check resistance between the two terminals. Resistance should be 33 - 39 ohms.
4. If resistance is within specification proceed to step 5. If not, replace solenoid.
5. Blow air into tube "A," air should exhaust through filter, not tube "B."
6. Reconnect electrical connector.
7. With ignition ON, ground Diagnosis Switch Terminal.
8. Blow air into tube "A," air should exhaust from tube "B." If EVRV solenoid fails the check, replace EVRV.