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HOMESERVICE MANUALSTOYOTA19904RUNNER 2D UTILITY, 2.4 R, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFIEMISSION SYSTEMS & SUB-SYSTEMSEXHAUST GAS RECIRCULATIONSYSTEM TEST
1990 Toyota 4Runner 2D Utility, 2.4 R, Automatic

System Test

1990 Toyota 4Runner 2D Utility, 2.4 R, AutomaticSECTION System Test
  1. Ensure modulator filter is clean and in good condition prior to performing test. Clean filter with compressed air as required. Disconnect vacuum hose from EGR valve.
  2. Using a "T" connector, connect a vacuum gauge in EGR valve vacuum line. Check that engine starts and runs at idle. This ensures proper seating of EGR valve.
  3. Different vacuum switching valves are used depending on model. See Fig 1, Fig 2 or Fig 3. The Bi-Metallic Vacuum Switching Valve (BVSV), Vacuum Switching Valve (VSV) and EGR modulator can be checked with engine coolant below minimum temperature and specified engine RPM in accordance with application. See EGR SPECIFICATIONS  table.
  4. Operate engine with engine coolant below minimum temperature and specified RPM. No vacuum reading should be obtained when operated with engine coolant below minimum temperature.
  5. Operate engine at normal operating temperature and specified RPM. See EGR SPECIFICATIONS  table for specified engine RPM. On all models, a low vacuum reading should be obtained.
  6. On models with 3VZ-E engines, ensure vacuum is not present at idle. Disconnect hose from the "R" port of EGR vacuum modulator. Using additional hose, connect "R" port directly to intake manifold. High vacuum reading should be obtained at specified engine RPM. See EGR SPECIFICATIONS  table.
    NOTE: Engine should misfire due to large amounts of exhaust gas being injected into intake manifold.
  7. To check EGR valve, apply vacuum directly to EGR valve with engine idling. Engine should run rough. If system did not operate as described, each component should be tested.
Fig 1: Pickup (22R-E, California) EGR System Components & Operating Parameters
G119252Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.