Section 42 (Charging System (Service Information)): Generator: Inspection: Inspection

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT GENERATOR WITH CLUTCH PULLEY
1. When rotating the generator pulley, check that it turns counterclockwise and does not turn clockwise.
  
  Fig 1: Inspecting Generator Clutch Pulley
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
1. Using vernier calipers, measure the exposed brush length.
  
  Fig 2: Measuring Exposed Brush Length
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard exposed length
  
  10.5 mm (0.413 in.)
  
  Minimum exposed length
  
  4.5 mm (0.177 in.)
  
  If the exposed length is less than the minimum, replace the generator brush holder assembly.
INSPECT GENERATOR ROTOR ASSEMBLY
1. Check that the generator rotor bearing is not rough or worn.
  
  Fig 3: Inspecting Generator Rotor Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If necessary, replace the generator rotor.
2. Check the generator rotor for an open circuit.
  
  Fig 4: Measuring Resistance Between Slip Rings
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Using an ohmmeter, measure the resistance between the slip rings.
    Standard resistance
    
    2.3 to 2.7 Ω at 20°C (68°F)
    
    If the result is not as specified, replace the generator rotor assembly.
3. Check the generator rotor for a short circuit.
  
  Fig 5: Measuring Resistance Between Slip Ring And Rotor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Using an ohmmeter, measure the resistance between the each slip ring and rotor.
    Standard resistance
    
    1 MΩ or higher
    
    If the result is not as specified, replace the generator rotor assembly.
4. Using vernier calipers, measure the slip ring diameter.
  
  Fig 6: Measuring Slip Ring Diameter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard diameter
  
  14.2 to 14.4 mm (0.559 to 0.567 in.)
  
  Minimum diameter
  
  14.0 mm (0.551 in.)
  
  If the diameter is less than the minimum, replace the generator rotor assembly.
INSPECT GENERATOR DRIVE END FRAME BEARING
1. Check the generator drive end frame bearing is not rough or worn.
  
  Fig 7: Inspecting Generator Drive End Frame Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If necessary, replace the generator drive end frame bearing.