1995 ACURA TL engine

Relay an d Contro l Uni t Location s
Engine Compartmen t
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Relay an d Contro l Uni t Location s
Engine Compartmen t (cont'd )
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Starting Syste m
Starter 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 :
• Us e a starte r syste m tester .
• Connec t an d operat e th e equipmen t i n accordanc e
wit h th e manufacturer' s instructions .
• Tes t an d troubleshoo t a s described .
Alternat e Procedure :
• Us 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 a voltmete r an d ammete r a s shown .
NOTE : Afte r thi s test , o r an y subsequen t repair , rese t
th e PC M to clea r an y code s (se e sectio n 11 ).
Chec k th e Starte r Engagemen t
1 . Disconnec t th e 8 P an d 6 P connecto r fro m th e ICM .
2. Wit h th e shif t leve r i n tur n th e ignitio n
switch t o STAR T (III) .
• Th e starte r shoul d cran k th e engine . I f th e starte r
doe s no t cran k th e engine , g o to ste p 3 .
• I f i t crank s th e engin e erraticall y o r to o slowly , g o
t o "Chec k fo r Wea r an d Damage " o n th e nex t
page .
3. Chec k th e battery , batter y positiv e cable , ground ,
starte r cu t relay , securit y contro l unit , an d th e wir e
connection s fo r loosenes s an d corrosion . Tes t again . I f
th e starte r stil l doe s no t cran k th e engine , g o to ste p 4 .
4. Unplu g th e connecto r (BLK/WH T wir e an d solenoi d
terminal ) fro m th e starter . Mak e sur e th e shif t leve r
is i n the n connec t a jumpe r wir e fro m th e
batter y positiv e (+ ) termina l t o th e solenoi d termi -
nal. Th e starte r shoul d cran k th e engine .
• I f th e starte r stil l doe s no t cran k th e engine , remov e
it , an d diagnos e it s interna l problem .
• I f th e starte r crank s th e engine , g o t o ste p 5 an d
continu e th e test .
5. Chec k th e ignitio n switch .
6. Chec k th e starte r cu t relay .
7 . Chec k th e A/ T gea r positio n switc h (se e pag e 23-109 ).
8 . Chec k th e securit y contro l unit .
9. Chec k fo r a n ope n i n th e WHT/RE D wir e betwee n
th e ignitio n switc h an d starte r cu t relay , an d chec k
fo r a n ope n i n th e BLK/WH T wir e betwee n th e
starte r cu t rela y an d starter .
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Check for Wear and Damage

The starter should crank the engine smoothly and steadily.

If the starter engages, but cranks the engine erratically,

remove it, and inspect the starter drive gear and torque

converter ring gear for damage.

• Check the drive gear overrunning clutch for binding

or slipping when the armature is rotated with the

drive gear held. If the clutch is damaged, replace the

clutch assembly.

Check Cranking Voltage and Current Draw

Cranking voltage should be no less than 8.0 volts.

Current draw should be no more than 450 amperes.

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

check for:

Dead or low battery

Open circuit in starter armature commutator segments

Starter armature dragging

Shorted armature winding

Excessive drag in engine

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

Check Starter Disengagement

With the shift lever in or , turn the ignition switch to

"START (III)", and release to "ON (II)". The starter drive

gear should disengage from the flywheel ring gear when

you release the key.

If the drive gear hangs upon the flywheel ring gear, check

for:

• Solenoid plunger and switch malfunction

• Dirty drive gear assembly or damaged overrunning

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Ignition Syste m
Descriptio n
Ignition Timin g Contro l
Th e programme d ignitio n syste m o n thi s engine provide s optimu m contro l o f ignitio n timing . A microcompute r deter -
mine s th e timin g base d o n informatio n abou t engin e spee d an d intak e manifol d vacuum , whic h i s transmitte d b y signal s
fro m th e CKP/CY P sensor , throttl e positio n (TP ) sensor , engin e coolan t temperatur e (ECT ) sensor , an d MA P sensor . Thi s
system , whic h i s no t dependen t o n a governo r o r vacuu m diaphragm , i s capabl e o f providin g ignitio n advanc e character -
istic s whic h canno t b e provide d b y conventiona l governors .
Basic Contro l
The PC M ha s store d withi n it th e basi c ignitio n timin g fo r operatin g condition s base d upo n engin e spee d an d intak e mani -
fol d vacuum . Wit h th e compensatin g signal s fro m sensors , th e syste m determine s optimu m ignitio n timin g an d duratio n
fo r ambien t condition s an d send s voltag e pulse s t o th e ICM .
Compensatio n o f ignitio n timing :
Contro l a t Star t
Ignitio n timin g is fixe d a t 5 ° BTD C fo r cranking . Th e crankin g is detecte d b y th e CK P senso r (crankin g rpm ) an d starte r signal .
Misfirin g Detectio n
A s par t o f th e OB D II misfirin g detectio n system , eac h o f th e ignitio n coi l ha s a built-i n spar k plu g voltag e sensor . Thi s senso r
detect s th e lon g duratio n hig h voltag e whic h occur s in cas e o f unfavorabl e combustio n o r misfiring . (Fo r details , se e
section 11 ).
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Ignition Syste m
Ignition Timin g Inspectio n
SRS component s ar e locate d in thi s area . Revie w th e SR S
componen t locations , precautions , an d procedure s i n th e
SR S (sectio n 24 ) befor e performin g repair s o r service .
1 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (shif t leve r i n position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
2 . Pul l ou t th e servic e chec k connecto r locate d unde r
th e glov e box . Connec t th e GRN/BL U an d OR N wir e
terminal s wit h th e specia l tool .
SCS SERVIC E CONNECTO R
( 07PAZ -0010100 )
5. Inspec t ignitio n timin g a t idl e speed .
Ignition Timing :
1 5 ± 2 BTD C (RED ) a t 64 0 + 50 rp m wit h shif t leve r
in positio n an d electrica l system s turne d
off.
6. I f th e ignitio n timin g i s incorrect , replac e th e PC M
(ther e i s n o wa y t o adjus t ignitio n timing) .
7 . Disconnec t th e specia l too l fro m th e servic e chec k
connector .
3
. Chec k th e idl e spee d (se e pag e 23-75 ).
4 . Connec t a timin g ligh t t o th e servic e loop ; whil e th e
engin e idles , poin t th e ligh t towar d th e pointe r o n
th e timin g bel t cover .
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Idle Spee d Chec k
1. Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d unti l th e radiato r fa n
come s on , the n le t i t idle .
2 . Connec t a tachomete r t o th e tes t tachomete r connec -
tor.
Nois e Condense r Capacit y Tes t
1. Us e a commerciall y availabl e condense r tester .
Connec t th e condense r teste r probe s an d measur e
th e condense r capacity .
NOTE : Th e nois e condense r i s intende d t o reduc e
ignitio n noise . However , condense r failur e ma y caus e
th e engin e t o sto p running .
2 . I f no t withi n th e specifications , replac e th e nois e con -
denser .
3. Adjus t th e idl e spee d if necessar y (se e sectio n 11 ).
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Fan Control s
Componen t Locatio n Inde x
ENGIN E COOLAN TTEMPERATUR E (ECT )SWITC H
Test , sectio n 10
Removal , sectio n 1 0
Radiato r Fa n Control :
Whe n th e engine oil temperatur e is abov e approximatel y 198° F (92°C ) afte r th e engin e ha s stopped , th e radiato r fa n wil l ru n
fo r abou t 1 5 minutes . Th e engin e coolan t temperatur e (ECT ) switc h i s i n th e thermosta t housing . Th e engin e oi l tempera -
tur e switc h i s locate d o n th e valv e cover . Th e radiato r fa n contro l modul e is locate d behin d th e glov e box .
ENGIN E OI L TEMPERATUR ESWITCHTest, sectio n 6
Replacement , sectio n 6
Test , page 23-109
Removal , sectio n 1 0 Test
, page 23-109
Removal , sectio n 1 0 Terminals
, page 23-93
Test
, page 23-62
Test, page 23-62
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