Section 27 (Charging System (Service Information)): Generator: Inspection: Inspection

WARNING: This page is about a different car, the 2012 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT CLUTCH PULLEY
1. Hold the center of the pulley, and confirm that the outer ring turns counterclockwise and does not turn clockwise.
  
  Fig 1: Inspecting Generator Clutch Pulley Function
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the clutch pulley.
INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
1. Using vernier calipers, measure the length of the exposed brushes.
  
  Fig 2: Measuring Length Of Exposed Brushes Using Vernier Calipers
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard length
  
  9.5 to 11.5 mm (0.374 to 0.452 in.)
  
  Minimum length
  
  4.5 mm (0.177 in.)
  
  If the exposed length is less than the minimum, replace the brush holder assembly.

INSPECT GENERATOR ROTOR ASSEMBLY

Check that the rotor bearing is not rough or worn.

Fig 3: Checking Rotor Bearing
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If necessary, replace the rotor bearing.

Check the rotor for an open circuit.

Fig 4: Measuring Resistance Between Slip Rings Using Ohmmeter

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an ohmmeter, measure the resistance between the slip rings.

Standard resistance

Condition	Specified condition
Approx. 20°C (68°F)	2.3 to 2.7 Ω

If the resistance is not within the specified range, replace the rotor assembly.

Check the rotor for a short to ground.

Fig 5: Measuring Resistance Between Slip Ring And Rotor

Using an ohmmeter, measure the resistance between the slip ring and rotor.

Standard resistance

Tester condition	Specified condition
Slip ring - Rotor	10 MΩ or higher

If the resistance is not within the specified range, replace the rotor assembly.

Using vernier calipers, measure the slip ring diameter.

Fig 6: Measuring Slip Ring Diameter Using Vernier Calipers
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard diameter

14.2 to 14.8 mm (0.559 to 0.583 in.)

Minimum diameter

14.0 mm (0.551 in.)

If the diameter is less than the minimum, replace the rotor assembly.

INSPECT GENERATOR DRIVE END FRAME BEARING
1. Check that the drive end frame bearing is not rough or worn.
  
  Fig 7: Checking Drive End Frame Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If necessary, replace the drive end frame bearing.