1994 MITSUBISHI 3000GT Workshop Manual

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System16-11
ABNORMAL WAVE-FORMS EXAMPLES
NOTE
1.The size of the wave-form patterns differs largely depending on the adjustment of the variable knob
on the analyzer.
2.Identification of abnormal wave-forms is easier when there is a large output current (regulator is not
operating). (Wave-forms can be observed when the headlights are illuminated.)
3.Check the conditions of the charge light (illuminated/not illuminated) also, and carry out a total check.
Abnormal wave-formsProblem cause
Example 1l Open diode
AALZELOlZO
Example 20 Short in diodeZ7EL0121
Example 30Broken wire in statorcoil
27EL0122
Example 40Short in stator coil
Z7EL0123
Example 5
1 r2rrirl
0 Open supplementarydiode
27EL01244t this time, the charge light is illuminated.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine 16-12ENGINE ELECTRICAL - Charging System
GENERATORREMOVAL AND INSTALLATION
Pre-removal and Post-installation Operationl Removal and Installation of Right Bank Warm Up
Three-Way Catalytic Converter(Refer to GROUP 15-Exhaust Pipe, Main Mufflerand Catalytic Converter.)14-18ft.lbs.
l b
Removal steps
1. Air hose E 2. Air hose C
3. Suction hose clamo nuts
conditioning,4. Drive belt
(Refer to GROUP 11
-Engine Adjustment.)
216FO346
5. Generator connector
6. Heated oxygen sensor connector
7. Generator and generator bracket
assembly8. Generator bracket
9. Generator
lo-12 Nm7-9 ft.lbs.24 NmREMOVAL SERVICE POINT
dAbCLAMP NUT REMOVAL
On vehicles with an air conditioning, remove the clamp
nut, raise the suction hose and suspend it from the engine
hood using a cord.
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System16-13DISASSEMBLY AND REASSEMBLY
i(Up to 1995 models)23I
LDisassembly steps
4A,1. Generator pulley.A+ 2. Rotor assembly3.Rear bearing4.Bearing retainer5.Front bearing6.Front bracket4B,7.Stator8. Insulator
9. Plate
10. Reaulator and brush holder
11.
Slinlger12. Rectifier13. Brush14. Brush spring
15. Rear bracket
4B,27EL0104
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine 16-14ENGINE ELECTRICAL - Charging System
(From 1996 models)
Disassembly steps
+A,,A+ :: ~%? assembly3.Rear bearing4.Bearing retainer5.Front bearing6.Front bracket
45,7.Stator assembly
13
TEN0906
8. Plate9. Regulator and brush holder
10. Brush
11. Slinger
12. Rectifier assembly
13. Rear bracket
IDISASSEMBLY SERVICE POINT
dAbGENERATOR PULLEY REMOVAL
(1) Remove the bolts.
(2) Insert plain screwdriver between front bracket and
stator core and pry downward.
Caution
Do not insert screwdriver too deep, as there is
danger of damage to
stator coil.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System16-15
WireZ6EN087!(3) Clamp the rotor in a vise with soft jaws.
(4) After removing the nut, remove the pulley and front
bracket from the rotor.
AB,STATOR / REGULATOR AND BRUSH HOLDER
REMOVAL
(1) When removing the stator, unsolder stator lead wirefrom the main diode of the rectifier.
(2) When removing the brush holder, unsolder it from
the rectifier.
Caution
(1) When soldering or unsoldering, be careful to
make sure that heat of soldering iron is not
transmitted to diodes for a long period. Finish
soldering or unsoldering in as short a time
as possible.
(2) Be careful that no undue force is exerted to
leads of diodes.REASSEMBLY SERVICE POINT
FAdROTOR ASSEMBLY INSTALLATION
Before rotor is attached to rear bracket, insert wire through
small hole made in rear bracket to lift brush. After rotor
has been installed, remove the wire.
3
TSB RevisionI
I

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System
h\Z3ELOlO
\23ELOllINSPECTION
ROTOR
(1) Check field coil for continuity. Check to ensure that there
is continuity between slip rings.If resistance is extremely small, it means that there is
a short. If there is no continuity or if there is short circuit,
replace rotor assembly.
Resistance value : Approx. 3-5 Q
(2) Check field coil for grounding. Check to ensure that thereis no continuity between slip ring and core. If there is
continuity, replace rotor assembly.
STATOR
(1) Make continuity test on stator coil. Check to ensure that
there is continuity between coil leads.
If there is no continuity, replace
stator assembly.
(2) Check coil for grounding. Check to ensure that there is
no continuity between coil and core. If there is continuity,
replace stator assembly.
RECTIFIERS
(1) Positive Rectifier Test
Check for continuity between positive rectifier and stator
coil lead connection terminal with a circuit tester. If there
is continuity in both directions, diode is shorted. Replace
rectifier assembly.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System16-17
Limit line
WELO
,Soldered
27EL0014
(2) Negative Rectifier Test
Check for continuity between negative rectifier and stator
coil lead connection terminal. If there is continuity in both
directions, diode is shorted, and rectifier assembly must
be replaced.
(3) Diode Trio Test
Check three diodes for continuity by connecting an amme-
ter to both ends of each diode. If there is no continuity
in both directions, diode is faulty and
heatsink assembly
must be replaced.
BRUSH REPLACEMENT
(1) Replace brush by the following procedures if it has been
worn to limit line.
(2) Unsolder pigtail and remove old brush and spring.
(3) Install brush spring and new brush in brush holder.(4) Insert the brush to where there is a space 2 to 3 mm
(.079 to .118 in.) between the limit line and the end of
the brush holder.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine 16-18ENGINE ELECTRICAL - Charging System
Soldered
Limit line
&
mm
o L%4
-if
T
9EN0192
(5) Solder pigtail to brush holder as shown in the illustration.
BRUSH REPLACEMENT
(1) Replace brush by the following procedures if it has beenworn to limit line.
(2) Unsolder pigtail and remove old brush and spring.
(3) When installing a new brush, push the brush in the brushholder as shown in the illustration, and solder the lead
wire.
1 TSB Revision