1995 ACURA TL ignition

Ignition Syste m
Componen t Locatio n Inde x
IGNITIO N TIMIN G CONTRO L SYSTE M
• Description , pag e 23-7 2
• Inspection , pag e 23-74
SPAR K PLU G VOLTAG E
DETECTIO N MODUL E
Troubleshooting ,section 1 1
SPAR K PLUG SInspection , pag e 23-7 8 IGNITIO
N COIL S
Test , pag e 23-7 7
NOIS E CONDENSE R
Test , pag e 23-75
IGNITIO
N CONTRO L MODUL E (ICM )
Inpu t Test , pag e 23-7 6
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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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Ignition Syste m
Ignition Contro l Modul e (ICM ) Inpu t Tes t
NOTE : Se e sectio n 1 1 i f th e malfunctio n indicator lamp (MIL ) blinks . Disconnec t th e 8 P connecto r fro m th e ignitio n contro l
modul e (ICM) . Inspec t th e connecto r an d socke t terminal s to b e sur e the y ar e al l makin g goo d contact .
• I f an y terminal s ar e bent , loos e o r corroded , repai r the m a s necessary , an d rechec k th e system .
• I f th e terminal s loo k OK , mak e th e followin g inpu t test s a t th e connector .
I f a tes t indicate s a problem , fin d an d correc t th e cause , the n rechec k th e system .
I f al l th e inpu t tes t prov e OK , th e IC M mus t b e faulty ; replac e it .
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Ignition Coi l Tes t
1. Wit h th e ignitio n switc h OFF .
2 . Remov e th e engin e cover , the n remov e th e ignitio n
coil .
3 . Usin g a n ohmmeter , measur e resistanc e betwee n
th e terminals . Replac e th e coi l i f th e resistanc e i s
no t withi n specification .
NOTE : Resistanc e wil l var y wit h th e coi l tempera -
ture ; specificatio n is a t 77° F (25°C) .
Primar y Windin g Resistanc e
(betwee n th e No . 1 an d No . 2 terminals )
0.9 -1. 1 ohm s
• I f th e resistanc e i s no t withi n specification ,
replac e th e coil .
• I f th e resistanc e i s OK , bu t othe r troubleshootin g
doesn' t revea l th e caus e o f th e problem , substi -
tut e a known-goo d ignitio n coi l an d chec k engin e
operatio n again .
I f th e engin e the n run s OK , replac e th e origina l
coil .
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Ignition Syste m
Spark Plu g Inspectio n
1. Inspec t th e electrode s an d cerami c insulato r for : 2. D o no t adjus t th e ga p o f platinu m tip plugs ; replac e
th e spar k plu g i f th e ga p i s ou t o f specificatio n o r i f
th e cente r electrod e i s rounded .
3 . Replac e th e plu g a t th e specifie d interval , o r i f th e
cente r electrod e is rounde d a s show n below :
4 . Appl y a smal l quantit y o f anti-seiz e compoun d t o
th e plu g threads , an d scre w th e plug s int o th e cylin -
de r hea d finger-tight . The n torqu e the m to 1 8 N- m
(1. 8 kgf-m , 1 3 Ibf-ft) .
NOTE
: Us e onl y th e spar k plug s liste d below .
Burne
d o r wor n electrode s ma y b e cause d by :
• Advance d ignitio n timin g
• Loos e spar k plu g
• Plu g hea t rang e to o lo w
• Insufficien t coolin g
Foule d plu g ma y b e cause d by :
Retarde d ignitio n timin g
Oi l i n combustio n chambe r
Incorrec t spar k plu g ga p
Plu g hea t rang e to o hig h
Excessiv e idling/lo w spee d runnin g
Clogge d ai r cleane r elemen t
Deteriorate d ignitio n coi l o r ignitio n wire s
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6. Reconnect the airbag connectors.

Front Passenger's Side:

'96 Model:

Attach the short connector (RED) to the connector

holder, then reinstall the glove box.

SHORT CONNECTOR

(RED) /HOLDER

FRONT PASSENGER'S

AIRBAG

3P CONNECTOR
SRS MAIN HARNESS

3P CONNECTOR

'97-98 Models:

Attach the airbag connector to the connector holder,

then install the glove box.

SRS MAIN HARNESS

2P CONNECTOR

FRONT PASSENGER'S

AIRBAG

2P CONNECTOR
Driver's Side:

Connect the driver's airbag 2P connector to the cable

reel 2P connector, then install the access panel on the

steering wheel.

CABLE REEL

2P CONNECTOR

ACCESS PANEL

DRIVER'S AIRBAG

2P CONNECTOR

7. Connect the battery positive cable, then connect the

negative cable.

8. After installing the airbag, confirm proper system

operation:

Turn the ignition switch ON (II); the SRS indicator

light should come on for about six seconds and

then go off.

Make sure both horn buttons work.

Take a test-drive, and make sure the cruise con-

trol switches work.

9. Enter the anti-theft code for the radio, then enter the

customer's radio station presets.ProCarManuals.com

17. Tighten the steering wheel bolt to the specified

torque. Then install the driver's airbag.

TORX BOLTS

9.8 N-m (1.0 kgf-m, 7.2 Ibf-ft)

Replace.

Use a Torx T30 bit.

STEERING WHEEL BOLT

38 N-m (3.9 kgf-m, 28 Ibf-ft)
DRIVER'S

AIRBAG

18. Attach the cable reel 2P connector to the connector

holder. Then install the dashboard lower cover.

CONNECTOR

HOLDER

CABLE REEL

2P CONNECTOR

SRS
MAIN

HARNESS

DASHBOARD LOWER COVER
19. Reconnect the driver's airbag 2P connector to the

cable reel 2P connector, and reinstall the access

panel on the steering wheel.

20. Reconnect the battery positive cable, then the nega-

tive cable.

21. After installing the cable reel, confirm proper sys-

tem operation:

Turn the ignition ON (II); the SRS indicator light

should come on for about six seconds and then

go
off.

Make sure both horn buttons work.

Make sure the headlight and wiper switches

work.

Go for a test drive, and make sure the cruise con-

trol switches work.

22. Enter the anti-theft code for the radio, then enter the

customer's radio station presets.ProCarManuals.com