Rectifier Test
NOTE: The diodes are designed to allow current to
pass in one direction while blocking it in the opposite
direction. Since the alternator rectifier is made up of
eight diodes (four pairs), each diode must be tested for
continuity in both directions with an ohmmeter that has
diode checking capability; a total of sixteen checks.
1. Check for continuity in each direction, between the
B and P, and between the E (ground) and P ter-
minals of each diode pair. All diodes should have
continuity in only one direction.
E (GROUND)
2. If any of the eight diodes fails, replace the rectifier
assembly. (Diodes are not available separately.)
Alternator Brush Inspection
1. Remove the end cover, then take out the brush
holder by removing its two screws.
2. Measure the length of the brushes with a vernier
caliper.
Alternator Brush Length:
Standard: 10.5 mm (0.41 in)
Service Limit: 3.5 mm (0.14 in)
ALTERNATOR BRUSHES
VERNIER CALIPER
If the brushes are less than the service limit,
replace the assembly.ProCarManuals.com
Charging System
Rotor Slip Ring Test
1. Check that there is continuity between the slip rings.
2. Check that there is no continuity between the slip
rings and the rotor or rotor shaft.
ROTOR SHAFT
SLIP RINGS
ROTOR
3. If the rotor fails either continuity check, replace the
alternator.
Stator Test
1. Check that there is continuity between each pair of
leads.
2. Check that there is no continuity between each lead
and the coil core.
LEADS
COIL CORE
3. If the coil fails either continuity check, replace the
alternator.ProCarManuals.com
Alternator Bel t Adjustmen t
Deflection Method :
1 . Appl y a forc e o f 9 8 N (1 0 kgf , 2 2 Ibf ) betwee n th e
alternato r an d crankshaf t pulley , an d measur e it s
deflection .
Deflection : 11-13. 5 m m (0.43-0.5 3 in )
NOTE : O n a brand-ne w belt , th e deflectio n shoul d
be 6- 8 m m (0.24-0.3 1 in ) befor e th e bel t ha s
had an y runnin g tim e o n th e engine .
ADJUSTIN G BOL T8 N- m (0. 8 kgf-m , 5. 8 Ibf-ft )
MOUNTIN G BOL T45 N- m (4. 6 kgf-m , 3 3 Ibf-ft )
ADJUSTMENT-LOC KNUT45 N- m (4. 6 kgf-m , 3 3 Ibf-ft )CRANKSHAF T PULLE Y
2. I f bel t deflectio n i s incorrect , loose n th e
adjustment-loc k nu t an d th e mountin g bolt .
3 . Tur n th e adjustin g bol t unti l bel t deflectio n i s cor -
rect , the n retighte n th e nu t an d bolt .
4 . Rechec k th e bel t tension . Tensio
n Gaug e Method :
1 . Attac h th e bel t tensio n gaug e t o th e belt , an d mea -
sur e bel t tension .
Tension : 45 0 - 65 0 N (4 5 - 6 5 kgf , 99-14 3 Ibf )
NOTE : O n a brand-ne w belt , th e tensio n shoul d b e
90 0 - 110 0 N (9 0 - 11 0 kgf , 19 8 - 24 3 Ibf ) befor e th e
bel t ha s ha d an y runnin g tim e o n th e engine .
MOUNTIN G BOL T45 N- m (4. 6 kgf-m , 3 3 Ibf-ft )
ADJUSTIN G BOL T8 N- m (0. 8 kgf-m , 5. 8 Ibf-ft )BELT TENSIO N GAUG E07JGG-001010 A
ADJUSTMENT-LOC KNUT45 N- m (4. 6 kgf-m ,33 Ibf-ft )CRANKSHAF T PULLE Y
2. I f bel t tensio n i s incorrect , loose n th e adjustment -
loc k nu t an d th e mountin g bolt .
3 . Tur n th e adjustin g bol t unti l bel t tensio n i s correct ,
the n retighte n th e nu t an d bolt .
4 . Rechec k th e bel t tension .
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