1997 Toyota Corolla Exhaust Gas Recirculation (EGR) System Test

I - SYSTEM/COMPONENT TESTS - 1.6L 1997 ENGINE PERFORMANCE Toyota - System & Component Testing - 4-Cyl.
NOTE: EGR systems contain different components depending on application. See Fig. 19 . When testing EGR system and components, use proper illustration to determine component location.
NOTE: When performing EGR system test, it may be necessary to monitor engine RPM by using scan tool. For scan tool connections, see IDLE SPEED & MIXTURE in ADJUSTMENTS article.
1. Ensure EGR vacuum modulator filter is clean and in good condition. Clean filter with compressed air (if necessary).
NOTE: EGR vacuum modulator filter must be installed with coarse side facing upward, away from EGR vacuum modulator.
2. Using "T" connector, install vacuum gauge in line with vacuum hose on top of EGR valve. Start engine. Ensure engine idles smoothly to ensure proper seating of EGR valve.
3. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1 located in engine compartment. See Fig. 15 .
NOTE: The EGR system components must 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 engine RPM. See EGR TESTING SPECIFICATIONS table. No vacuum reading should be obtained.
5. Warm engine to more than the specified operating temperature. See EGR TESTING
SPECIFICATIONS table. Operate engine at specified engine RPM again. See EGR TESTING
SPECIFICATIONS table. Ensure a low vacuum reading is obtained with engine at the specified RPM.
6. Disconnect vacuum hose from port "R" on EGR vacuum modulator. See Fig. 18 . Using additional hose, connect port "R" on EGR vacuum modulator directly to intake manifold. High vacuum reading should be obtained at specified engine RPM. See EGR TESTING SPECIFICATIONS table.

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