Alternator: Testing and Inspection

1GR-FE BATTERY / CHARGING: GENERATOR: INSPECTION

1. INSPECT GENERATOR WITH CLUTCH PULLEY

(a) Hold the center of the generator with clutch pulley and check that the outer ring turns counterclockwise and does not turn clockwise.





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

2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY

(a) Using a vernier caliper, measure the brush length.

Standard exposed length:

9.5 to 11.5 mm (0.374 to 0.453 in.)

Minimum exposed length:

4.5 mm (0.177 in.)





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

3. INSPECT GENERATOR ROTOR ASSEMBLY

(a) Check that the generator rotor bearing is not rough or worn.





If necessary, replace the generator rotor assembly.

(b) Check the generator rotor for an open circuit.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:









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

(c) Check if the generator rotor is grounded.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:









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

(d) 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:

14.0 mm (0.551 in.)





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