Section 21 (Charging System (2TR-FE)): Generator: Inspection

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
1. Using vernier calipers, measure the exposed 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.)
  
  If the exposed length is less than the minimum, replace the generator brush holder assembly.
  
  Fig 1: Inspecting Generator Brush Holder Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR REGULATOR ASSEMBLY
1. Using an ohmmeter, check the continuity between terminals F and B.
  Standard: When the positive and negative poles between terminals F and B are exchanged, there is continuity in one way but no continuity in another way.
  
  If the continuity is not specified, replace the generator regulator assembly.
  
  Fig 2: Checking Continuity Between Terminals F & B Using Ohmmeter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using an ohmmeter, check the continuity between terminals F and E.
  Standard: When the positive and negative poles between terminals F and B are exchanged, there is continuity in one way but no continuity in another way.
  
  If the continuity is not specified, replace the generator regulator assembly.
  
  Fig 3: Checking Continuity Between Terminals F & E Using Ohmmeter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT GENERATOR HOLDER WITH RECTIFIER

Using an ohmmeter, check the continuity between terminals P1, P2, P3, P4 and B, and between P1, P2, P3, P4 and E.

Fig 4: Inspecting Generator Holder With Rectifier

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard

GENERATOR HOLDER WITH RECTIFIER

Terminals	Specified Condition
P1, P2, P3, P4 and B	Continuity in one direction but no continuity in the other direction
P1, P2, P3, P4 and E	Continuity in one direction but no continuity in the other direction

If the continuity is not as specified, replace the generator rectifier holder.

INSPECT GENERATOR ROTOR ASSEMBLY
1. Check for open in the generator rotor circuit.
  1. Using an ohmmeter, measure the resistance between the slip rings.
    Standard resistance: 1.7 to 2.1 Ω at 20°C (68°F)
    
    If the resistance is not as specified, replace the generator rotor assembly.
    
    Fig 5: Measuring Resistance Between Slip Rings Using Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check for short in the generator rotor circuit.
  1. Using an ohmmeter, check that there is no continuity between the slip ring and generator rotor assembly.
    If there is continuity, replace the generator rotor assembly.
    
    Fig 6: Checking If There Is No Continuity Between Slip Ring & Generator Rotor Assembly Using Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect slip rings.
  1. Check that the slip rings are not rough or scored.
    If rough or scored, replace the generator rotor assembly.
  2. 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 7: Measuring Slip Ring Diameter Using Vernier Calipers
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002