2AZ-FE Charging: Generator: Inspection

Standard length: 

9.5 to 11.5 mm (0.374 to 0.453 in.) 

Minimum length: 

4.5 mm (0.177 in.) 

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

Fig 1: Identifying Brush Length

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1. Measure the resistance between the slip rings.

   Standard resistance: 

   2.3 to 2.7 Ω at 20°C (68°F) 

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

   Fig 2: Identifying Resistance Between Slip Ring And Rotor Core

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2. Measure the resistance between the slip ring and rotor core.

   Standard resistance: 

   1 MΩ or higher 

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

   Fig 3: Identifying Resistance Between Slip Ring And Rotor Core

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1. Using a vernier caliper, measure the slip ring diameter.

   Standard diameter: 

   14.2 to 14.4 mm (0.559 to 0.567 in.) 

   Minimum diameter: 

   14 mm (0.551 in.) 

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

   Fig 4: Identifying Slip Ring Diameter

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1. Check that the bearing is not rough or worn.

   OK: The bearing rotates smoothly. 

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

   Fig 5: Checking Bearing

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Standard: 

The bearing rotates smoothly. 

If the bearing does not rotate smoothly, replace the generator assembly.

Fig 6: Inspecting Generator Drive End Frame Bearing

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002