Subaru Legacy

since 1990-1998 release

Repair and operation of the car

Subaru of Legasi
+ 1.1. Identification numbers
+ 2. Maintenance
+ 3. Engines
+ 4. Heating, ventilation
- 5. Fuel system
   5.1. Introduction
   5.2. Technical characteristics
   5.3. Removal of pressure in fuel system
   5.4. Check of the fuel pump
   5.5. Fuel pump
   5.6. Fuel separator (only models 4WD)
   5.7. Fuel level sensor
   5.8. Fuel tank
   5.9. Casing of the air filter
   5.10. Accelerator cable
   5.11. Electronic system of injection of fuel
   5.12. Fuel system
   5.13. System of air supply
   5.14. System of electronic control
   5.15. Check of system of injection of fuel
   - 5.16. Check and replacement of elements of system of injection of fuel
      5.16.1. Throttle case
      5.16.2. Fuel highway
      5.16.3. Fuel pressure regulator
      5.16.4. Fuel nozzles (MPFI)
      5.16.5. Fuel nozzle (SPFI)
      5.16.6. Control air valve (IAC)
      5.16.7. Sensor of provision of a butterfly valve (SPFI)
   5.17. Turbocharger
   5.18. Check of the executive mechanism of the gate of a turbocharger
   5.19. General check of a turbocharger
   5.20. Removal and installation of a turbocharger
+ 6. Exhaust system
+ 7. Systems of start, ignition
+ 8. Transmissions
+ 9. Coupling, shaft
+ 10. Brake system
+ 11. Suspension bracket
+ 12. Steering
+ 13. Body
+ 14. Electric equipment


5.16.6. Control air valve (IAC)


1. On the cold engine include ignition and check that on the socket of the control air valve there is tension.
2. Warm up the engine up to the normal working temperature, switch off ignition and remove the control air valve. Check that the gate of the valve was completely closed. Otherwise replace the control air valve.
3. Check resistance of the control air valve. If the ohmmeter shows break or short circuit, replace the control air valve. When checking the control air valve resistance between contacts 1 and 2 and contacts 2 and 3 has to be equal 9 Ohms.


1. Disconnect the electric socket from the control air valve and disconnect hoses of supply of cooling liquid (1) and an air hose (2).
2. Unscrew bolts and remove the control air valve.
3. Installation is made in sequence, the return to removal. Thus it is necessary to use new laying.