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.
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HOMESERVICE MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORTESTING AND INSPECTION
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Alternator: Testing and Inspection
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Testing and Inspection
INSPECTION
1. INSPECT ROTOR
a. Check the rotor for open circuit.
1. Using an ohmmeter, check that there is continuity between the slip rings.
Standard resistance: 1.5 to 1.9 Ohms at 20 degrees C (68 degrees F)
If there is no continuity, replace the rotor.
b. Check the rotor for ground.
1. Using an ohmmeter, check that there is no continuity between the slip ring and rotor.
If there is continuity, replace the rotor.
c. Check that the slip rings are not rough or scored. If rough or scored, replace the rotor.
d. 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.
2. INSPECT BRUSHES
a. Using vernier caliper, measure the exposed brush length.
Standard exposed length: 10.5 mm (0.413 in.)
Minimum exposed length: 4.5 mm (0.177 in.)
If the exposed length is less than the minimum, replace the brushes and the brush holder assembly.
3. INSPECT BEARING
a. Check the bearing is not rough or worn.
If necessary, replace the bearing.
1. INSPECT ROTOR
a. Check the rotor for open circuit.
1. Using an ohmmeter, check that there is continuity between the slip rings.
Standard resistance: 1.5 to 1.9 Ohms at 20 degrees C (68 degrees F)
If there is no continuity, replace the rotor.
b. Check the rotor for ground.
1. Using an ohmmeter, check that there is no continuity between the slip ring and rotor.
If there is continuity, replace the rotor.
c. Check that the slip rings are not rough or scored. If rough or scored, replace the rotor.
d. 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.
2. INSPECT BRUSHES
a. Using vernier caliper, measure the exposed brush length.
Standard exposed length: 10.5 mm (0.413 in.)
Minimum exposed length: 4.5 mm (0.177 in.)
If the exposed length is less than the minimum, replace the brushes and the brush holder assembly.
3. INSPECT BEARING
a. Check the bearing is not rough or worn.
If necessary, replace the bearing.
RENDER: 1.0x
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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.