Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Charging Systems: Inspection
- Inspect rotor for open circuit.
Using an ohmmeter, check that there is continuity between the slip rings. If there is no continuity, replace the rotor.
- Standard Resistance: 2.1-2.5 Ω at 20°C (68°F)
- Inspect rotor for ground. Using an ohmmeter, check that there is no continuity between the slip ring and rotor. If there is continuity, replace the rotor.
- Inspect slip rings.
- Check that the slip rings are not rough or scored. If rough or scored, replace the rotor.
- Using a vernier caliper, measure the slip ring diameter. If the diameter is less than minimum, replace the rotor.
- Standard Diameter: 14.2-14.4 mm (0.559-0.567 in.)
- Minimum Diameter: 12.8 mm (0.504 in.)
- Inspect stator for open circuit. Using an ohmmeter, check that there is continuity between the coil leads. If there is no continuity, replace the drive end frame assembly.
- Inspect stator for ground. Using an ohmmeter, check that there is no continuity between the coil lead and drive end frame. If there is continuity, replace the drive end frame assembly.
- Inspect exposed brush length.
Using a vernier caliper, measure the exposed brush length. If the exposed length is less than minimum, replace the brushes and brush holder assembly.
- Standard Exposed Length: 10.5 mm (0.413 in.)
- Minimum Exposed Length: 1.5 mm (0.059 in.)
- Inspect positive rectifier.
- Using an ohmmeter, connect one tester probe to the positive (+) terminal and the other to each rectifier terminal.
- Reverse the polarity of the tester probes and repeat step (a).
- Check that one shows continuity and the other shows no continuity. If continuity is not as specified, replace the rectifier holder.
- Inspect negative rectifier.
- Using an ohmmeter, connect one tester probe to each negative (-) terminal and the other to each rectifier terminal.
- Reverse the polarity of the tester probes and repeat step (a).
- Check that one shows continuity and the other shows no continuity. If continuity is not as specified, replace the rectifier holder.
- Inspect front bearing. Check that the bearing is not rough or worn.
- If necessary, replace front bearing.
- Remove the 4 screws, bearing retainer and bearing.
- Using a socket wrench and press, press out the bearing.
- Using SST (SST 09950-60010/09951-00500) and a press, press in a new bearing.
- Install the bearing retainer with the 4 screws.
- Torque: 3.0 N.m (31 kgf.cm, 27 in. lbf)
- Inspect rear bearing. Check that the bearing is not rough or worn.
- If necessary, replace rear bearing.
- Using SST (SST 09820-00021), remove the outside bearing cover and bearing.NOTE: Be careful not to damage the fan.
- Using SST (SST 09820-00021), remove the outside bearing cover and bearing.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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