Section 17 (Charging System (1GR-FE)): Generator: Inspection

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
1. Using vernier calipers, measure the exposed brush length.
  - Standard exposed brush length: 10.5 mm (0.413 in.)
  - Minimum exposed brush length: 4.5 mm (0.177 in.)
  If the exposed brush length is less than the minimum, replace the brush holder.
  
  Fig 1: Measuring Exposed Brush Length Using Vernier Calipers
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR ROTOR ASSEMBLY
1. Check the rotor for an open circuit.
  1. Using an ohmmeter, measure the resistance between the slip rings.
    Standard: 2.3 to 2.7 Ω at 20°C (68°F)
    
    If the result is not as specified, replace the rotor.
    
    Fig 2: Measuring Resistance Between Slip Rings Using Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the rotor for ground.
  1. Using an ohmmeter, measure the resistance between the slip ring and rotor.
    Standard: 10 kΩ or higher
    
    If the result is not as specified, replace the rotor.
    
    Fig 3: Measuring Resistance Between Slip Ring & Rotor Using Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the slip rings.
  1. Check that the slip rings are not rough or scored. If rough or scored, replace the rotor.
  2. Using vernier calipers, measure the slip ring diameter.
    - 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 rotor.
    
    Fig 4: Measuring Slip Ring Diameter Using Vernier Calipers
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR ROTOR BEARING
1. Check the bearing whether it is rough or worn. If necessary, replace the generator rotor.
  
  Fig 5: Checking Generator Rotor Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002