2007 Lexus ES 350FACTORY OEM SERVICE PROCEDURE

Charging Systems: Charging: Generator: Inspection

  1. INSPECT GENERATOR CLUTCH PULLEY 
    1. Hold the center of the pulley, and confirm that the outer ring turns counterclockwise and does not turn clockwise.

      If the result is not as specified, replace the clutch pulley.

      Fig 1: Inspecting Generator Clutch Pulley
      G04975772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY 
    1. Using vernier calipers, measure the length of the exposed brushes.

      Standard exposed length: 

      9.5 to 11.5 mm (0.374 to 0.453 in.) 

      Minimum exposed length: 

      4.5 mm (0.177 in.) 

      If the exposed length is less than the minimum, replace the brush holder assembly.

      Fig 2: Measuring Length Of Exposed Brushes
      G04975798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT GENERATOR ROTOR ASSEMBLY 
    1. Check that the generator rotor bearing is not rough or worn.

      If necessary, replace the generator rotor assembly.

      Fig 3: Checking Generator Rotor Bearing
      G04975799Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the generator rotor for an open circuit.
      1. Using an ohmmeter, measure the resistance between the slip rings.

        Standard resistance 

        RESISTANCE SPECIFICATION

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

        If the result is not as specified, replace the generator rotor assembly.

        Fig 4: Measuring Resistance Between Slip Rings
        G04975800Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the rotor for a short to ground.
      1. Using an ohmmeter, measure the resistance between the slip ring and rotor.

        Standard resistance 

        RESISTANCE SPECIFICATION

        Tester condition Specified condition
        Slip ring - Rotor 1 MΩ or higher

        If the result is not as specified, replace the generator rotor assembly.

        Fig 5: Measuring Resistance Between Slip Ring And Rotor
        G04975801Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. 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 generator rotor assembly.

      Fig 6: Measuring Slip Ring Diameter Using Vernier Calipers
      G04975802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT GENERATOR DRIVE END FRAME BEARING 
    1. Check that the drive end frame bearing is not rough or worn.

      If necessary, replace the drive end frame bearing.

      Fig 7: Inspecting Generator Drive End Frame Bearing
      G04975803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.