Section 31 (Charging): Generator: Inspection

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT GENERATOR ROTOR
1. Check if the rotor has 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 resistance is not as specified, replace the rotor.
  
  Fig 1: Measuring Resistance Between Slip Rings
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check if the rotor is grounded.
  Using an ohmmeter, check the resistance between the slip ring and the rotor core.
  
  Standard: 10 kΩ or higher
  
  If the resistance is not as specified, replace the rotor.
3. Check that the slip rings are not rough or scored.
  If rough or scored, replace the rotor.
  
  Fig 2: Checking Resistance Between Slip Ring And Rotor Core
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Using a vernier caliper, measure the slip ring diameter.
  Specified diameter:
  
  14.2 to 14.4 mm (0.559 to 0.567 in.)
If the diameter is less than the minimum, replace the rotor.

Fig 3: Measuring Slip Ring Diameter Using Vernier Caliper
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT BRUSH HOLDER
Using a vernier caliper, 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 holder.

Fig 4: Measuring Exposed Brush Length Using Vernier Caliper
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT BEARING
Check that the bearing is not rough or worn.

If necessary, replace the generator rotor.

Fig 5: Inspecting Bearing
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002