Sienna FWD V6-3.3L (3MZ-FE) (2006)
3. INSPECT FLOW CONTROL VALVE
a. Coat the flow control valve with power steering fluid and check that it falls smoothly into the flow control valve hole by its own weight.
If necessary, replace the vane pump assembly.
b. Check the flow control valve for leakage. Close one of the holes and apply compressed air of 392 to 490 kPa (4 to 5 kg/cm2, 57 to 71 psi)
into the opposite side hole, and confirm that air does not come out from the end holes. If necessary, replace the vane pump assembly.
4. INSPECT FLOW CONTROL VALVE COMPRESSION SPRING
a. Using vernier calipers, measure the free length of the compression spring.
Minimum free length: 32.24 mm (1.2693 inch)
If it is not within the specification, replace the vane pump assembly.
5. INSPECT PRESSURE PORT UNION
If the union seat in the pressure port union is remarkably damaged, it may cause fluid leakage. Replace the vane pump assembly.