SFI SYSTEM DETAILS CAMSHAFT TIMING OIL CONTROL VALVE

  1. CONSTRUCTION

    1. This camshaft timing oil control valve assembly controls the spool valve using duty cycle control from the ECM. This allows hydraulic pressure to be applied to the VVT-i controller (camshaft timing gear assembly and camshaft timing exhaust gear assembly) advanced or retarded side. When the engine is stopped, the camshaft timing oil control valve assembly (for intake camshaft) will move to the retard position, and the camshaft timing oil control valve assembly (for exhaust camshaft) will move to the advanced position.

      Figure 1. Camshaft Timing Oil Control Valve Assembly (Intake)
      W139902C01

      *1

      Sleeve

      *2

      Spring

      *3

      Spool Valve

      -

      -

      *a

      to Intake VVT-i Controller (Camshaft Timing Sprocket Assembly) (Advance Side)

      *b

      to Intake VVT-i Controller (Camshaft Timing Sprocket Assembly) (Retard Side)

      *c

      Drain

      *d

      Oil Pressure
      Figure 2. Camshaft Timing Oil Control Valve Assembly (Exhaust)
      W139903C01

      *1

      Sleeve

      *2

      Spring

      *3

      Spool Valve

      -

      -

      *a

      To VVT-i Controller (Camshaft Timing Exhaust Gear Assembly) (Retard Side)

      *b

      To VVT-i Controller (Camshaft Timing Exhaust Gear Assembly) (Advanced Side)

      *c

      Drain

      *d

      Oil Pressure