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Home >> Dodge and Ram >> 1997 >> Caravan Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L >> Trouble Code Tests >> Test TC-46A - EGR System Failure

Test TC-46A - EGR System Failure

NOTE: Test applies only to 3.3L (gasoline).
  1. Ensure all accessories are off. Start engine and warm engine to normal operating temperature.
  2. Disconnect electrical connector from EGR solenoid. The EGR solenoid is located on top of EGR backpressure transducer which contains vacuum hose to EGR valve.
    NOTE: Electrical connector from EGR solenoid should be disconnected for the remaining portion of this test. When this test is completed, use scan tool to clear Diagnostic Trouble Codes (DTCs) from Powertrain Control Module (PCM).
  3. Disconnect vacuum supply hose from EGR solenoid. Using vacuum gauge, check vacuum on vacuum supply hose for EGR solenoid. If vacuum is more than 10 in. Hg, go to next step. If vacuum is 10 in. Hg or less, repair vacuum supply to EGR solenoid. Perform TEST VER-2A.
  4. Reconnect vacuum supply hose on EGR solenoid. Disconnect vacuum hose at top of EGR valve. This is the vacuum hose that fits between EGR solenoid and EGR valve.
  5. Connect vacuum gauge on vacuum hose for EGR valve. If vacuum reading does not pulsate, go to step 9). If vacuum reading pulsates, go to next step.
  6. Monitor vacuum reading while momentarily increasing engine speed to more than 2000 RPM. If vacuum reading stabilizes, go to next step. If vacuum reading does not stabilize, replace EGR valve assembly. Perform TEST VER-2A.
  7. Remove EGR valve. Inspect EGR valve, intake manifold and signal tube for restrictions. Signal tube is located below EGR valve and contains a vacuum hose which fits between signal tube to the bottom of EGR backpressure transducer.
  8. If restrictions exist, repair or replace components as necessary, Perform TEST VER-2A. If no restrictions exist, replace EGR valve assembly. Perform TEST VER-2A.
  9. Reinstall vacuum hose on top of EGR valve. Disconnect backpressure vacuum hose from EGR backpressure transducer. This is the vacuum hose that goes from bottom of EGR backpressure transducer to signal tube (lower port) located below EGR valve.
  10. Install vacuum gauge on backpressure vacuum hose. If vacuum reading does not pulsate, go to next step. If vacuum reading pulsates, replace EGR valve assembly. Perform TEST VER-2A.
  11. Check for sizeable exhaust leaks. If sizeable exhaust leaks exist, repair as necessary. Perform TEST VER-2A. If no sizeable exhaust leaks exist, check for loose EGR valve mounting bolts or defective EGR valve mounting gasket.
  12. If loose EGR valve mounting bolts or defective EGR valve mounting gasket exist, repair as necessary. Perform TEST VER-2A. If EGR valve mounting bolts and EGR valve mounting gasket are okay, replace EGR valve assembly. Perform TEST VER-2A.
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