1996 ACURA RL KA9 engine

PGM-FI Syste m
Crankshaf t Position/Cylinde r Positio n (CKP/CYP ) Senso r
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0335 : A malfunctio n in th e circui t o f th e Crankshaf t
Positio n (CKP ) senso r 1 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0336 : A n intermitten t interruptio n proble m of the
Crankshaf t Positio n (CKP ) senso r 1 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1337 : A malfunctio n i n th e circui t o f th e Crankshaf t
Positio n (CKP ) senso r 2 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1336 : A n intermitten t interruptio n proble m o f th e
Crankshaf t Positio n (CKP ) senso r 2 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1381 : A n intermitten t interruptio n proble m o f th e
Cylinde r Positio n (CYP ) senso r 1 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1382 : A malfunctio n in th e circui t o f th e Cylinde r Positio r
(CYP ) senso r 1 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1386 : A n intermitten t interruptio n proble m of the
Cylinde r Positio n (CYP ) senso r 2 .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1387 : A malfunctio n in th e circui t o f th e Cylinde r Positio n
(CYP) senso r 2 .
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2 . Star t th e engine .
I s DT C P0335 , P0336 , P1337 , P1336 ,
P1381 , P1382 , P138 6 and/o r P138 7
indicated ?
Chec k fo r a n ope n in th e CKP/CY P
sensor:1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e CKP/CY P 8 P
connector .
3 . Measur e resistanc e betwee n
the terminal s o f th e indicate dsensor (se e table) .
I s ther e 65 0 - 85 0
YES
Chec k fo r a shor t i n th e CKP/CY Psensor:Check fo r continuit y t o bod yground o n bot h terminal s o f th eindicate d sensor . CY
P PICK-U P
COI L 2
CY P PICK-U P
COI L 1
Intermitten t failure , syste m is O K
a t thi s time . Chec k fo r poo r con -
nection s o r loos e wire s a t C251 ,
C25 5 (locate d a t lef t shoc k tower) ,
C13 0 (CKP/CYP ) senso r an d PCM .
Replac e th e CKP/CY P senso r (se e
sectio n 6 ).
CKP/CYP SENSO R 8 P CONNECTO R
Termina l sid e o f mal e terminal s
(T o pag e 11-107 )
NO
YE S
NO
CK P PICK-U P
COI L 1CK P PICK-U PCOIL 2
Th e CK P Senso r determine s timin g fo r injectio n an d ignitio n o f eac h cylinde r an d als o detect s engin e speed .
Th e CY P Senso r detect s th e positio n o f No . 1 cylinde r fo r sequentia l injectio n t o eac h cylinder . Th e CKP/CY P Senso r i s
installe d behin d th e fron t camshaf t pulley .
— Th e MI L ha s bee n reporte d on .
— DT C P0335 , P0336 , P133 7
P1336 , P1381 , P1382 , P138 6
and/o r P138 7 ar e stored .
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PGM-FI Syste m
Barometri c Pressur e (Baro ) Senso r
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1106 : A range/performanc e proble m in th e Barometri c
Pressure (BARO ) Senso r circuit .
Is DT C P110 6 indicated ? Intermitten
t failure , syste m is O K
a t thi s time .
YES
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 symp -
tom/indicatio n goe s away , replac e
th e origina l PCM .
NO
Proble m verification :
1 . D o th e PC M rese t procedure .
2 . Connec t th e SC S servic e con -
nector .
3. Star t th e engine . Hol d th eengin e a t 3,00 0 rp m wit h n oloa 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. Test-driv e wit h th e transmis -sion i n position .
5 . Accelerat e fo r fiv e second s
usin g wid e ope n throttle .
—
Th e MI L ha s bee n reporte d on .
— DT C P110 6 is stored .
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Idle Contro l Syste m
NOTE: I f DT C P150 8 is store d a t th e sam e tim e a s DT C P0505 , troubleshoo t DT C P150 8 first , the n troubleshoo t DT C P0505 .
Possibl e Caus e
• IA C valv e mechanica l malfunctio n
• Idl e ai r contro l therma l valv e malfunctio n
• Throttl e bod y clogge d port , imprope r adjustmen t
• Intak e manifol d gaske t leakag e
• Intak e ai r hos e loos e o r leakin g
• Vacuu m hose s leakag e
• EC T senso r incorrec t outpu t
• Throttl e Positio n senso r incorrec t output *
•: '9 6 mode l onl y
— Th e MI L ha s bee n reporte d on .
— DT C P050 5 is stored .
Proble m verification :
1 . Star t th e engine . Hol d th e
engin e a t 3,00 0 rp m wit h n o
loa d
(in Par k or neutral ) untilthe radiato r fa n come s on ,then le t i t idle .
2 . Wit h th e sca n tool , chec k th e
followin g item s ('9 6 mode l
only) .
— Throttl e positio n shoul d b e
abou t 10 % wit h th e throttl e
fully closed .— Engin e coolan t tempera -
tur e shoul d b e abou t 17 6 -
194° F (80-90°C) .
I f the y ar e no t withi n th e spec. ,
repai r th e fault y senso r circuit .
3 Chec k th e engin e spee d a t
idl e wit h no-loa d conditions :
headlights , blowe r fan , rea r
defogger , radiato r fan , an d ai r
conditione r ar e no t operating .
Is i t 65 0 5 0 rpm ?
NO
Is i t 60 0 rp m o r less ?
YES
Intermitten t failure , syste m is O Kat thi s time .
NO
(T o pag e 11-114 ) (T o pag e 11-114 )
YES
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0505 : Idl e contro l syste m malfunction .
Troubleshootin g Flowchar t
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— Th e MI L ha s bee n reporte d on .
— DT C P150 8 is stored .
Proble m verification :
1. D o th e PC M Rese t Procedure .2. Star t th e engine .
Is DT C P150 8 indicated ?
YES
Chec k fo r a n ope n i n the wire
(IGP 1 line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e IA C valv e con -
nector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n bod y
groun d an d th e IA C valv e con -
necto r termina l No . 2 .
I s ther e batter y voltage ?
I s ther e batter y voltage ?
YES
Chec k th e IA C valv e function :
Momentaril y connec t PC M con -
necto r terminal s A 5 an d A1 2 wit h
a jumpe r wire severa l times .
Doe s th e IA C valv e click ?
YES
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 symp -
tom/indicatio n goe s away , replac e
th e origina l PCM .
SHAF T
Intermitten t failure , syste m is O K
a t thi s time . Chec k fo r poo r con -
nection s o r loos e wire s a t C25 3
(locate d a t lef t shoc k tower) ,
C12 9 (IA C valve ) an d PCM .
SPRIN G
IAC VALV E CONNECTO R (C129 )
Repair ope n in th e wir e betwee n
IA C valv e an d PGM-F I mai n relay . Wir
e sid e o f femal e terminal s
PCM CONNECTO R A (26P )
Repai r ope n o r shor t i n th e wir e
betwee n PC M (A5 ) an d IA C valve . Wir
e sid e o f femal e terminal sJUMPER WIR E
Replac e th e IA C valve .NO
NO
Chec k fo r a n ope n o r shor t i n th ewir e (IAC V line) :
1 . Tur n th e ignitio n switc h OF F
an d reconnec t th e IA C valv e
connector .2. Disconnec t th e PC M connec -tor A (26P) .3. Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n
bod y groun d an d PC M con -
necto r termina l A5 .
NO
YE S
VALV E
To INTAK EMANIFOL DFrom AI RCLEANE RCOIL
NO
Idl e Ai r Contro l (IAC ) Valv e
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1508 : A proble m in th e Idl e Ai r Contro l (IAC ) valv e
circuit .
The IA C Valv e change s th e amoun t o f ai r bypassin g th e throttl e bod y i n respons e t o a curren t signa l fro m th e PC M in
orde r t o maintai n th e prope r idl e speed .
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(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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