LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 1993 >> Corolla LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Exhaust Gas RECIRCULATION >> EGR System Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

EGR System Test

  1. Ensure EGR vacuum modulator filter is clean and in good condition. Clean filter with compressed air (if necessary).
  2. Using "T" connector, install vacuum gauge in vacuum line to EGR valve. Start engine. Ensure engine runs idles smoothly to ensure proper seating of EGR valve.
  3. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 of data link connector No. 1, located in engine compartment. See Figure.
    NOTE: The EGR system components can be checked with engine coolant temperature less than minimum temperature and engine at specified engine RPM.
  4. Operate engine with engine coolant temperature less than minimum temperature and at specified RPM. See EGR TESTING SPECIFICATIONS  table. No vacuum reading should be obtained.
  5. Warm engine to normal operating temperature. Operate engine at specified engine RPM again. Ensure a low vacuum reading is now obtained.
  6. To check EGR valve operation, remove vacuum hose from EGR valve. Using vacuum pump, apply vacuum directly to EGR valve with engine idling. Engine should run rough or stall.
  7. If EGR system does not operate as described, each individual component should be tested. Shut engine off. Remove jumper wire from data link connector No. 1.
EGR TESTING SPECIFICATIONS

Model Minimum Temperature RPM
Corolla 117°F (47°C) 2500
scientia non olet · About LEMON Manuals