engine ACURA RL KA9 1996 Service Repair Manual

(From pag e 11-116 )
I s ther e a clickin g nois e fro m
th e A/ C compresso r clutch ?
NO
YE S
Chec k fo r a n ope n i n th e wir e(ACC line) :Momentaril y connec t th e A/ C
clutc h rela y connecto r termina l
No. 4 to bod y groun d wit h ajumpe r wir e severa l times .
A/C CLUTC H RELA Y CONNECTO R (C344 )
Wire sid e o f
femal e terminal s
I s ther e a clickin g nois e fro m
th e A/ C compresso r clutch ? Se
e ai r conditione r inspectio n
(se e sectio n 22 ).
YE S
Repai r ope n in th e wir e betwee n
th e PC M (A8 ) an d th e A/ C clutc h
relay.
PCM CONNECTOR S
Check th e A/ C operation :
1 . Star t th e engine .
2 . Tur n th e blowe r switc h ON .
3 . Tur n th e A/ C switc h ON .
Doe s th e A/ C operate ?
YES
Chec k fo r a n ope n i n th e wir e
(AC S line) :
Measur e voltag e betwee n PC M
connecto r terminal s A2 6 an d C2 .
Ai r conditionin g signa l i s OK . Wir
e sid e o f femal e terminal s
I s voltag e les s tha n 1. 0 V ?
YE S
Repai r ope n in th e wir e betwee n
th e PC M (C2 ) an d th e radiato r fa n
contro l unit .
— Substitut e a known-goo d PC M
an d rechec k (se e pag e 11-42
fo r immobilize r information) .
I f symptom/indicatio n goe s
away , replac e th e origina l PCM .
— Se e th e ai r conditione r inspec -
tio n (se e sectio n 22 ).N O
NO
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Idle Contro l Syste m
Alternato r (ALT ) F R Signa l
PCM CONNECTOR S
Is ther e abou t 5 V ?
YE S
Chec k th e operatio n o f th e ALT :
1 . Tur n th e ignitio n switc h OFF .
2 . Reconnec t th e AL T GR N 4 P
connecto r t o th e ALT .
3 . Star t th e engine . Hol d th e
engin e a t 3,00 0 rp m wit h n o
loa d (i n Par k o r neutral ) unti l
th e radiato r fa n come s on ,
then le t i t idle .4. Measur e voltag e betwee n PC M
connecto r terminal s D 5 an d A26 .
Doe s th e voltag e decreas e whe n
headlight s an d rea r defogge r ar e
turne d on ?
NO
Chec k fo r a n ope n in th e wir e (AL T
F line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e negativ e bat -
ter y cabl e fro m th e battery .
3 . Disconnec t th e PC M connec -
tor D (22P) .4. Disconnec t th e GR N 4 P con -
necto r fro m th e ALT .
5 . Connec t th e AL T 4 P connecto r
termina l No . 4 to bod y groun d
wit h a jumpe r wire .
6 . Chec k fo r continuit y betwee n
body groun d an d PC M con -necto r termina l D5 .
I s ther e continuity ?
YES
See th e AL T inspectio n
(see sectio n 4 ).
N O
Wir e sid e o f femal e terminal s
Chec k fo r a shor t i n th e wir e (AL T
F line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e negativ e bat -
ter y cabl e fro m th e battery .
3 . Disconnec t th e PC M connecto r
D (22P) .4. Chec k fo r continuit y betwee n
bod y groun d an d PC M con -
necto r termina l D5 .
I s ther e continuity ? Repai
r shor t i n th e wir e betwee n
the PC M (D5 ) and th e ALT .
NO
Substitut e a known-goo d PC Mand rechec k (se e pag e 11-4 1 fo rimmobilize r information) . I f pre -
scribe d voltag e is no w available ,
replac e th e origina l PCM .
AL T F R signa l i s OK .
ALT GR N 4 P CONNECTO R (C131 )
Repair ope n wir e betwee n th ePCM (D5 ) and th e ALT .
PCM CONNECTO R D (22P )
Wir e sid e o f femal e terminal s
NO
Wir e sid e o f femal e terminal s
YES YE
S
This signal s th e PC M whe n th e Alternato r (ALT ) i s charging .
Inspection o f AL T F R Signal .
Chec k fo r a shor t i n th e wir e (AL T
F line) :
1 . Disconnec t th e GR N 4 P con -
necto r fro m th e ALT .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e voltag e betwee n PC M
connecto r terminal s D 5 an d A26 .
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Idle Contro l Syste m
Power Steerin g Pressur e (PSP ) Switc h Signa l
This signal s th e PC M whe n th e powe r steerin g loa d is high .
Inspectio n o f PS P switc h signal .
Chec k fo r a n ope n in th e wir e (PS P
S W line) :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e voltag e betwee n PC M
connecto r terminal s B 3 an d A26 .
I s ther e les s tha n 1.0V ?
NO
YE S
Chec k th e operatio n o f th e PS P
switch :
1 . Star t th e engine .
2. Tur n steerin g whee l t o ful llock .
3 . Measur e voltag e betwee n PC M
connecto r terminal s B 3 an d A26 .
I s ther e batter y voltage ?
NO
PC M CONNECTOR S
Chec k fo r a n ope n in th e wir e (PS P
S W Iine) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PS P switc h
connector .
3 . Tur n th e ignitio n switc h O N (II) .
4. A t th e wir e side , connec t th ePS P switc h connecto r termi -
nal s No . 1 an d No . 2 wit h a
jumpe r wire .
5 . Measur e voltag e betwee n PC M
connecto r terminal s B 3 an d A26 . Wir
e sid e o f femal e terminal s
PS P SWITC H CONNECTO R (C120 )
JUMPE RWIRE
Wire sid e o f femal e terminal s
I s ther e les s tha n 1.0V ?
NO
— Repai r ope n i n th e wire be-
twee n th e PC M (B3 ) an d th e
PS P switch .
— Repai r ope n i n wir e betwee n
the PC M (D22 ) and th e PS Pswitch .
(T o pag e 11-121 )
PS P switc h signa l i s OK .
YES
Replac e th e PS P switch .
YES
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Idle Ai r Contro l Therma l Valv e
Descriptio n
T o preven t errati c runnin g whe n th e engin e i s warmin g
up , i t i s necessar y t o rais e th e idl e speed . Th e idl e ai r
contro l therma l valv e i s controlle d b y a thermowa x
plunger . Whe n th e engin e i s cold , th e engin e coolan t
surroundin g th e thermowa x contract s th e plunger ,
allowin g additiona l ai r t o b e bypasse d int o th e intak e
manifol d s o tha t th e engin e idle s faster . Whe n th e
engin e reache s operatin g temperature , th e valv e closes ,
reducin g th e amoun t o f ai r bypassin g int o th e intak e
manifold .
IDLE AI R
CONTRO L
THERMA LVALVE
IDLEADJUSTIN GSCREWIAC VALV E
AIR BYPAS SVALVE
WAX
Inspectio n
NOTE : Th e idl e ai r contro l therma l valv e i s factor y
adjusted ; i t shoul d no t b e disassembled .
1 . Remov e th e cove r o f th e idl e ai r contro l therma l
valve.
2. Star t th e engine .
3 . Pu t you r finge r o n th e valv e sea t area , an d mak e sur e
tha t ther e i s ai r flo w wit h th e engin e col d (engin e
coolan t temperatur e belo w 86°F , 30°C ) an d idling .
O-RING SReplace .
12 N- m(1.2 kgf-m , 8. 7 Ibf-ft )
4. Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h n o
loa d (i n Par k o r neutral ) unti l th e radiato r fa n come s
on , the n le t i t idle .
5 . Chec k tha t th e valv e i s completel y closed . I f not , ai r
suctio n ca n b e fel t i n th e valv e sea t area .
I f an y suctio n is felt , th e valv e is leaking .
Chec k engin e coolan t leve l an d fo r ai r i n th e engin e
coolin g syste m (se e sectio n 10 ).
I f th e coolin g syste m is OK , replac e th e idl e ai r contro l
therma l valv e an d recheck .
NOTE : I f th e cove r o f idl e ai r contro l therma l valv e wa s
removed , d o th e PC M rese t procedure .
IDLE AI RCONTRO LTHERMALVALVE
If ther e i s n o ai r flow , replac e th e idl e ai r contro l
therma l valv e an d retest .
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Idle Contro l Syste m
Idle Spee d Settin g
Inspection/Adjustmen t
NOTE:
• Befor e settin g th e idl e speed , chec k th e followin g
items:
— Th e MI L ha s no t bee n reporte d on .
— Ignitio n timin g
— Spar k plug s
— Ai r cleane r
— PC V syste m
• (Canada ) Depres s th e parkin g brak e pedal . Star t th e
engine , the n chec k tha t th e headlight s ar e off .
1 . Connec t a OBDI I sca n too l (se e pag e 11-40 ) o r
tachometer .
• Connec t a tachomete r t o ignite r uni t secondar y
loo p (white-taped) .
• Remov e th e rubbe r ca p fro m th e tachomete r
connecto r an d connec t a tachometer .
TACHOMETE RCONNECTORTACHOMETE R
RUBBERCAP
BATTER Y
2. Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
n o loa d (i n Par k o r neutral ) unti l th e radiato r fa n
come s on , the n le t i t idle . 3
. Disconnec t th e IA C valv e connector .
IAC VALV E
4. I f th e engin e stalls , star t th e engin e wit h th e acceler -
ato r peda l slightl y depressed . Stabiliz e th e rp m a t
1,000 , the n slowl y releas e th e peda l unti l th e engin e
idles .
5 . Chec k idlin g unde r th e followin g conditions : head -
light s (Hi ) an d rea r defogge r on , blowe r fan , radia -
to r fan , an d ai r conditione r ar e no t operating .
Idl e spee d shoul d be :
480 5 0 rp m
(in Par k o r neutral )
Adjust th e idl e speed , i f necessary , b y turnin g th e
idl e adjustin g screw .
NOTE : Afte r adjustin g th e idl e spee d i n thi s step ,
rechec k th e ignitio n timin g (se e sectio n 4 ).
I f i t i s ou t o f spec , g o bac k t o ste p 4 .
IDL E ADJUSTIN G SCRE W
TACHOMETE
R
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6. Tur n th e ignitio n switc h OFF .
7. Reconnec t th e 2 P connecto r o n th e IA C valve , the n
d o th e PC M rese t procedure .
NOTE : Th e PC M memor y settin g i s neede d afte r
resettin g th e PCM .
8 . Restar t an d idl e th e engin e wit h no-loa d condition s
fo r on e minute , the n chec k th e idl e speed .
NOTE : (Canada ) Pul l th e parkin g brak e leve r up .
Star t th e engine , the n chec k tha t th e headlight s ar e
off.
Idle spee d shoul d be :
650 5 0 rp m
(in Par k o r neutral )
NOTE: I f th e idl e spee d i s no t withi n specification ,
se e Sympto m Char t o n pag e 11-44 .
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PCM Memory Setting

NOTE: The PCM reset procedure and disconnecting the

battery or the BACK UP RADIO (7.5 A) fuse cancels the

PCM memory for idle control. The following procedure

is needed after the PCM reset procedure and reconnect-

ing the battery or the BACK UP RADIO (7.5 A) fuse.

1. Start the engine. Hold the engine at 3,000 rpm with

no load (in Park or neutral) until the radiator fan

comes on.

2. Let the engine idle for approx. 5 minutes under the

following conditions:

• Transmission in Park or neutral

• A/C switch OFF

• Headlights OFF

• Rear defogger OFFProCarManuals.com

Fuel Suppl y Syste m
System Descriptio n
The fue l suppl y syste m consist s o f a fue l tank , in-tan k
high-pressur e fue l pump , PGM-F I mai n relay , fue l filter ,
fue l pressur e regulator , fue l pressur e regulato r contro l
solenoi d valve , injectors , an d fue l deliver y an d retur n
lines . Thi s syste m deliver s pressure-regulate d fue l t o th e
injector s an d cut s th e fue l deliver y whe n th e engin e i s
no t running .
Fuel Pressur e
Relieving
Befor e disconnectin g fue l pipe s o r hoses , releas e pres -
sur e fro m th e syste m b y loosenin g th e servic e bol t o n
top o f th e fue l filter .
SERVIC E
BOL T
12 N- m(1.2 kgf-m , 8. 7 Ibf-ft )
FUE L
FILTE R
SHOP TOWE L
NOTE:
• A fue l pressur e gaug e can be attache d a t th e ser -
vic e bol t hole .
• Alway s replac e th e washe r betwee n th e servic e
bol t an d th e specia l banj o bol t wheneve r th e ser -
vic e bol t i s loosened .
• Replac e al l washer s wheneve r th e bolt s ar e
removed . Inspectio
n
1 . Reliev e fue l pressure .
2 . Remov e th e servic e bol t o n th e fue l filte r whil e hold -
in g th e banj o bol t wit h anothe r wrench . Attac h th e
specia l tool .
FUEL FILTE R
3. Star t th e engine . Measur e th e fue l pressur e wit h th e
engin e idlin g an d th e vacuu m hos e o f th e fue l pres -
sur e regulato r disconnecte d fro m th e fue l pressur e
regulato r an d pinched . I f th e engin e wil l no t start ,
turn th e ignitio n switc h O N (II) , wai t fo r tw o sec -
onds , tur n i t OFF , the n bac k o n agai n an d rea d th e
fue l pressure .
Pressur e shoul d be :
29 9 - 34 8 kP a (3.0 5 - 3.5 5 kgf/cm
2, 43. 4 - 50. 5 psi )
4 . Reconnec t vacuu m hos e to th e fue l pressur e regula -
tor.
Pressur e shoul d be :
24 0 - 28 9 kP a (2.4 5 - 2.9 5 kgf/cm2, 34. 8 - 41. 9 psi )
I f th e fue l pressur e i s no t a s specified , firs t chec k th e
fue l pum p (se e pag e 11-142 ). I f th e fue l pum p is OK ,
chec k th e following :
• I f th e fue l pressur e i s highe r tha n specified ,
inspec t for :
— Pinche d o r clogge d fue l retur n hos e o r line .
— Fault y fue l pressur e regulato r (se e pag e
11-135 ).
• I f th e fue l pressur e i s lowe r tha n specified , inspec t
for:
— Clogge d fue l filter .
— Fault y fue l pressur e regulato r (se e pag e
11-135 ).
— Fue l lin e leakage .
1
. Mak e sur e yo u hav e th e anti-thef t cod e fo r th e
radio , the n writ e dow n th e frequencie s fo r th e
radio' s prese t buttons .
2 . Disconnec t th e batter y negativ e cabl e fro m th e bat -
ter y negativ e terminal .
3. Remov e th e fue l fil l cap .
4. Us e a bo x en d wrenc h o n th e servic e bol t a t th e fue l
filte r whil e holdin g th e specia l banj o bol t wit h
anothe r wrench .
5. Plac e a ra g o r sho p towe l ove r th e servic e bolt .
6 . Slowl y loose n th e servic e bol t on e complet e turn .
7 . Reconnec t th e battery , ente r th e anti-thef t cod e fo r
th e radio , the n ente r th e customer' s radi o statio n
presets .
•
D o no t smok e whil e workin g o n th e fue l system .
Kee p ope n flame s o r spark s awa y fro m you r wor k area .
• B e sur e t o reliev e fue l pressur e whil e th e ignitio n
switch is off .
CLAM P
FUE
L
PRESSUR E
REGULATO R FUE
L
PRESSUR E
GAUG E
07406-004000 1
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Fuel Supply System

Injectors (cont'd)

13. Slide new cushion rings onto the injectors.

14. Coat new O-rings with clean engine oil, and put them on the injectors.

15. Insert the injectors into the fuel rail first.

16. Coat new seal rings with clean engine oil and press them into the intake manifold.

17. To prevent damage to the O-ring, install the injectors in the fuel rail first, then install them in the intake manifold.

FUEL

RAILS

18. Install and tighten the retainer nuts.

19. Connect the 3P connector to the MAP sensor.

20. Connect the fuel hose to the fuel rail.

21. Connect the vacuum pipe.

22. Connect the vacuum hose and fuel return hose to the fuel pressure regulator.

23. Install the connectors on the injectors.

24. Connect the PCV valve.

25. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for approximately 2 seconds,

the fuel pressure in the fuel line rises. Repeat this two or three times, then check whether there is any fuel leakage.

26. Install the engine cover.

27. Install the strut bar.ProCarManuals.com

Fuel Pressur e Regulato r
Descriptio n
Th e fue l pressur e regulato r maintain s a constan t fue l
pressur e t o th e injectors . Whe n th e differenc e betwee n
th e fue l pressur e an d manifol d pressur e exceed s 29 4
kP a (3. 0 kgf/cm
2, 4 3 psi) , th e diaphrag m is pushe d
upward , an d th e exces s fue l i s fe d bac k int o th e fue l tan k
throug h th e retur n line .
DIAPHRAG M
FUEL INLE T
OPEN :
ToINTAK EMANIFOL D
FUELRETUR N
FUEL INLE T
Testin g
Do no t smok e durin g th e test . Kee p ope n
flame s awa y fro m you r wor k area .
1 . Attac h a fue l pressur e gaug e t o th e servic e por t o f
th e fue l filte r (se e pag e 11-132 ).
2 . Star t th e engine .
Pressur e shoul d be :
299 - 34 8 kP a (3.0 5 - 3.5 5 kgf/cm2, 43-5 0 psi )
(wit h th e fue l pressur e regulato r vacuu m hos e dis -
connecte d an d pinched )
FUELPRESSUR EGAUGE07406 - 0040001
FUELPRESSUR EREGULATO R
FUEL FILTE R
3. Reconnec t th e vacuu m hos e t o th e fue l pressur e
regulator .
4 . Chec k tha t th e fue l pressur e rise s whe n th e vacuu m
hos e fro m th e fue l pressur e regulato r i s disconnect -
e d again .
I f th e fue l pressur e di d no t rise , replac e th e fue l pres -
sur e regulator .
(cont'd)
11-135
CLOSED :
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