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EGR VSV

  1. Disconnect negative battery cable. Remove glove compartment subassembly. Connect ECU Check Sub Harness (09842-87704 000 ) between ECU and engine wiring.
  2. Reconnect negative battery cable. Disconnect rubber hose connected to EGR VSV. Connect vacuum pump to modulator side port of EGR VSV and apply vacuum. Ensure that no vacuum is applied.
  3. If vacuum is applied, replace EGR VSV. Connect a vacuum pump to surge tank side port of EGR VSV and apply 3.94 in. Hg.
  4. If no vacuum is applied, replace EGR VSV. Ensure that vacuum applied in step 3) becomes zero with ignition on. If vacuum fails to become zero, check if any voltage is present between ECU Check Sub Harness terminal "EVSV" (18) and "E01" (21).
  5. If voltage is present, check ECU. If no voltage is present, check EGR VSV for power supply. Measure resistance of EGR VSV and check wiring for open wire. Resistance should be 30-55 ohms.
  6. If no problems are found, replace EGR VSV. If problem is found, repair and/or replace (as necessary). Start engine. With coolant temperature less than 104°F (40°C), connect a vacuum pump to port at EGR VSV surge tank side.
  7. Ensure vacuum is present. If vacuum is not present, check coolant pressure sensor. With coolant temperature greater than 104°F (40°C), connect a vacuum pump to port at EGR VSV surge tank side.
  8. Engine should run rough or stall when a vacuum is applied. If engine does not run rough or stall when vacuum is applied, check coolant temperature sensor or EGR system.
  9. Reconnect rubber hoses that were disconnected during inspection. With coolant temperature less than 104°F (40°C), start engine. While engine is warming up, measure voltage between ECU Check Sub Harness terminal "EVSV" (18) and "E01" (21).
  10. Ensure that measured voltage drops before cooling fan motor comes on. If no drop in voltage occurs, check and/or repair coolant temperature sensor system. If coolant temperature is operating properly, check ECU.
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