Power Steering Vane Pump (2UZ-FE): Inspection

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Check oil clearance between vane pump shaft and bushing .
Using a micrometer and caliper gauge, measure the oil clearance.

Standard clearance: 0.03 - 0.05 mm (0.0012 - 0.0020 in.)

Maximum clearance: 0.07 mm (0.0028 in.)

Fig 1: Measuring Vane Pump Shaft To Bushing Oil Clearance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If it is more than the maximum, replace the shaft and front housing.
Inspect vane pump rotor and vane plates .
1. Using a micrometer, measure the height, thickness and length of the 10 plates.
  
  Fig 2: Measuring Vane Plates
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Minimum height: 8.6 mm (0.339 in.).
  
  Minimum thickness: 1.397 mm (0.0550 in.).
  
  Minimum length: 14.991 mm (0.5902 in.).
2. Using a feeler gauge, measure the clearance between the rotor groove and plate.
  Maximum clearance: 0.033 mm (0.0013 in.) .
  
  Fig 3: Measuring Rotor Groove & Plate Clearance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If it is more than the maximum, replace the plate and/or rotor with one having the same mark stamped on the cam ring.
  
  Inscribed mark: 1, 2, 3, 4 or None .
  
  NOTE: There are 5 vane plate lengths with the following rotor and cam ring marks.
  
  Fig 4: Locating Rotor & Cam Ring Marks
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Rotor & Cam Ring Identification/Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect flow control valve :
1. Coat the valve with power steering fluid and check that it falls smoothly into the valve hole by its own weight.
  
  Fig 6: Inspecting Flow Control Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the flow control valve for leakage.
  
  Fig 7: Testing Flow Control Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Close one of the holes and apply compressed air 392-490 kPa (4-5 kgf/cm² , 57-71 psi) into the opposite side, and confirm that air does not come out from the end holes.
  
  If necessary, replace the valve with one having the same letter as inscribed on the front housing.
  
  Inscribed mark: A, B, C, D, E or F
  
  Fig 8: Locating Flow Control Valve Marks
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect spring .
Using vernier calipers, measure the free length of the spring.

Fig 9: Measuring Flow Control Valve Spring Length
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Minimum free length: 33.2 mm (1.307 in.).

If it is not within the specification, replace the spring.