1997 ACURA NSX Service Repair Manual

Starting Syste m
Descriptio n
Starter Interloc k Syste m (M/T) :
Th e starte r interloc k syste m prevent s th e engin e fro m startin g unles s th e clutc h peda l i s full y depressed .
The clutc h interloc k switc h turn s o n a t th e positio n wher e th e clutc h disengages : 1 5 - 2 0 m m (0.5 9 - 0.7 9 in ) fro m full y
depresse d position .
NOTE: A ful l strok e o f th e clutc h peda l i s 12 5 m m (4.9 2 in ) fro m th e full y release d position .
CLUTCH INTERLOC K SWITC H
Full y Release d
Positio n
CLUTC
H PEDA L
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Starting Syste m
Starte r Tes t
NOTE : Th e ai r temperatur e mus t b e betwee n 5 9 an d
100° F (1 5 an d 38°C ) befor e testing .
Recommende d Procedure :
Use a starte r syste m tester .
Connec t an d operat e th e equipmen t i n accor -
danc e wit h manufacturer' s instructions .
Alternat e Procedure :
Us e th e followin g equipment :
— Ammeter , 0 - 40 0 A
— Voltmeter , 0 - 2 0 V (accurat e withi n 0. 1
volt )
— Tachometer , 0 -1,20 0 rp m
Hoo k u p voltmete r an d ammete r a s shown .
NEGATIV E CABL E
POSITIV ECABLE
1. Disconnec t th e No . 1 3 (3 0 A ) fus e fro m th e engin e
compartmen t fuse/rela y box .
No. 1 3 (3 0 A )FUS E
2. Chec k th e starte r engagement :
Depres s th e clutc h peda l al l th e wa y (M/T ) o r shif t
to o r positio n (A/T) , an d tur n th e ignitio n
switc h t o "Star t (III)" . Th e starte r shoul d cran k th e
engine .
NOTE: O n car s equippe d wit h manua l transmis -
sion , th e engin e wil l no t cran k unles s th e clutc h
peda l i s full y depressed .
I f th e starte r stil l doe s no t cran k th e engine ,
chec k th e battery , batter y positiv e cable ,
ground and th e wir e connection s fo r loosenes s
o r corrosion .
Tes t again .
If th e starte r stil l doe s no t cran k th e engine ,
bypas s th e ignitio n switc h circui t a s follows :
Unplu g th e connecto r (BLK/WH T wire ) fro m th e
starter . Connec t a jumpe r wir e fro m th e batter y
positiv e ( + ) termina l t o th e solenoi d terminal .
Th e starte r shoul d cran k th e engine .
SOLENOI D TERMINA L
BLK/WHTWIRE
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— If the starter still does not crank the engine,

remove the starter and diagnose its internal

problems.

— If the starter cranks the engine, check for an

open in the BLK/WHT wire and connectors be-

tween the starter and ignition switch. Check the

ignition switch.

On cars with automatic transmission, check the

A/T gear position switch (neutral position

switch) and connector.

On cars with manual transmission, check the

starter cut relay, clutch interlock switch and

connectors.

NOTE: Check the No. 29 (50 A) fuse and the

starter cut relay, and inspect the security alarm

system.

3. Check for wear or damage:

The starter should crank the engine smoothly and

steadily.

If the starter engages, but cranks the engine er-

ratically, remove the starter motor. Inspect the

starter, drive gear and flywheel ring gear for

damage.

Check the drive gear overrunning clutch for binding

or slipping when the armature is rotated with the

drive gear held. Replace the gears if damaged.

4. Check cranking voltage and current draw:

Voltage should be no less than 8.5 volts.

Current should be no more than 350 amperes.

If voltage is too low, or current draw too high,

check for:

Low battery.

Open circuit in starter armature commutator

segments.

Starter armature dragging.

Shorted armature winding.

Excessive drag in engine.
5. Check cranking rpm:

Engine speed during cranking should be above 100

rpm.

If speed is too low, check for:

Loose battery or starter terminals.

Excessively worn starter brushes.

Open circuit in commutator segments.

Dirty or damaged helical spline or drive gear.

Defective drive gear overrunning clutch.

6. Check the starter disengagement:

Depress the clutch pedal all the way (M/T) or shift to

or position (A/T), turn the ignition switch to

"Start (III)", and release to ON (II).

The starter drive gear should disengage from the

flywheel ring gear.

If the drive gear hangs up on the flywheel ring gear,

check:

Solenoid plunger and switch for malfunction.

Drive gear assembly for dirt or damaged over-

running clutch.ProCarManuals.com

Starting Syste m
Starter Cu t Rela y Tes t
1. Remov e th e glov e bo x (se e sectio n 20 ).
2 . Disconnec t th e 4 P connecto r fro m th e starte r cu t
relay .
(Wire color s o f 4 P connector : BLK/GRN , BLK/WHT ,
BLK/BLU an d BLK/WHT )
3. Chec k continuit y a t th e rela y terminals .
Ther e shoul d b e continuit y betwee n th e C an d D
terminals .
Ther e shoul d b e continuit y betwee n th e A an d B
terminal s whe n powe r an d groun d ar e connect -
e d t o th e C an d D terminals .
Ther e shoul d b e n o continuit y betwee n th e A an d
B terminal s whe n powe r i s disconnected .
Clutch Interloc k Switc h Tes t (M/T ) -
1 . Remov e th e dashboar d lowe r cover , the n disconnec t
th e 2 P connecto r fro m th e switch .
2 . Chec k fo r continuit y betwee n th e terminal s accord -
in g t o th e table .
CLUTC HINTERLOC KSWITCH
CLUTC H PEDA L
3. I f necessary , replac e th e switc h o r adjus t th e switc h
positio n (se e sectio n 12 ).
RELEASE D
PUSHED
Clutch Peda l
Termina lAB
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Starter Solenoid Test

1. Check the hold-in coil for continuity between the S

terminal and the armature housing (ground).

The coil is OK if there is continuity.

ARMATURE HOUSING

(GROUND)

2. Check the pull-in coil for continuity between the S

and M terminals.

The coil is OK if there is continuity.
Starter Replacement

1. Disconnect the battery negative cable.

2. Remove the engine wire harness from the harness

clip on the starter motor.

3. Disconnect the starter cable and the BLK/WHT

wire.

4. Remove the two bolts holding the starter, and

remove the starter.

UPPER MOUNTING BOLT

75 N-m (7.6 kgf-m, 55 Ibf-ft)

B TERMINAL MOUNTING NUT

9 N-m (0.9 kgf-m, 6.5 Ibf-ft)

STARTER CABLE

LOWER MOUNTING BOLT

75 N-m (7.6 kgf-m, 55 Ibf-ft)
BLK/WHT WIREProCarManuals.com

Starting Syste m
Starter Overhau l
CAUTION : Disconnec t th e groun d cabl e fro m th e bat -
tery befor e removin g th e starter .SOLENOI DPLUNGERInspection , pag e 23-8 6
STARTE RSOLENOI D
Test , pag e 23-8 1
OVERRUNNIN G
CLUTC H ASSEMBL Y
BRUS H HOLDE R
ARMATUR E
IDLER GEA R
PINION GEAR
EN D COVE R
O-RING
Replace .
FIELD WINDING /ARMATUR E HOUSIN G
Test , pag e 23-8 6
BRUS H HOLDE R
Test , pag e 23-8 3
BRUSH
Inspection ,page 23-8 3
O-RING
Replace .
ARMATUR EInspection an d Test ,
pag e 23-8 4
HARNES S CLI P BRACKE T STEE
L BAL L
Whe n reassemblin g
install stee l bal lfrom clutc h side .
MOLYBDENU MDISULFIDE ROLLE
R BEARING S
an d CAG E
Se t thes e asid e s o yo u won' t los e them .
MOLYBDENU M DISULFID E
OVERRUNNIN G CLUTC H ASSEMBL Y
Inspection , pag e 23-8 7
GEAR HOUSIN GMOLYBDENU MDISULFIDE
SOLENOI D HOUSIN G IDLE
R GEA R
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Starter Brus h Holde r Tes t
1. Chec k tha t ther e i s n o continuit y betwee n th e
and brus h holders .
I f continuit y exists , replac e th e brus h holde r
assembly .
BRUSH HOLDE R BRUSH HOLDE R
BRUSH HOLDE RBRUSH HOLDE R
2. Inser t th e brus h int o th e brus h holder , an d brin g th e
brus h int o contac t wit h th e commutator , the n at -
tac h a sprin g scal e t o th e spring . Measur e th e
sprin g tensio n a t th e momen t th e sprin g lift s of f th e
brush .
Spring Tension :
18.0-24.0 N (1.80-2.4 0 kg , 4.0-5. 3 Ibs )
SPRIN G SCAL E
BRUS H
SPRIN G
Starter Brus h Inspectio n
Measure th e brus h length . I f no t withi n th e servic e limit ,
replac e th e armatur e housin g an d brus h holde r
assembly .
Brus h Lengt h
Standar d (New) : 15.0-15. 5 m m (0.59 1 -0.61 0 in )
Servic e Limit : 10. 0 m m (0.39 4 in )
BRUS H
NOTE : T o sea t ne w brushe s afte r installin g the m i n
their holders , sli p a stri p o f #50 0 o r #60 0 sandpaper ,
with th e gri t sid e up , ove r th e commutator , an d
smoothl y rotat e th e armature . Th e contac t surfac e o f
th e brushe s wil l b e sande d t o th e sam e contou r a s th e
commutator .
23-83
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Starting Syste m
Armatur e Inspectio n an d Tes t
1. Inspec t th e armatur e fo r wea r o r damag e du e t o
contac t wit h th e fiel d coi l magnets .
Inspect fo rdamage .
2. A dirty o r burn t commutato r surfac e ma y b e resur -
faced wit h emer y clot h o r a lath e withi n th e follow -
ing specifications .
Commutato r Diamete r
Standar d (New) : 29.9—30. 0 m m
(1.177-1.18 1 in )
Servic e Limit : 29. 0 m m (1.14 2 in )
VERNIE R CALIPE R
COMMUTATO R
Commutator Runou t
Standar d (New) : 0-0.0 2 m m (0-0.000 8 in )
Servic e Limit : 0.0 5 m m (0.00 2 in )
DIA LINDICATO R
3.
COMMUTATO R
3. I f th e commutato r runou t an d diamete r ar e withi n
limits, chec k th e commutato r fo r damag e o r fo r car -
bo n dus t o r bras s chip s betwee n th e segments .
4. I f th e surfac e is dirty , reconditio n it wit h a #50 0 o r
#60 0 sandpaper . Then , chec k mic a depth . I f
necessary , undercu t mic a wit h a hacksa w blad e t o
achiev e prope r depth .
COMMUTATO R
SANDPAPER
MICA DEPT H
Commutato r Mic a Dept h
Standar d (New) : 0.5-0. 8 m m (0.02-0.0 3 in )
Servic e Limit : 0. 2 m m (0.00 8 in )
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