1996 ACURA RL KA9 light

How to Use the Backprobe Sets

Connect the backprobe adapters to the stacking patch cords, and connect the cords to a multimeter. Using the wire

insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip into the connector from the wire

side until it comes in contact with terminal end of the wire.

Backprobe Adapter
DIGITAL MULTIMETER

(Commercially available) or

KS
-
AHM
-
32
-
003

Stacking Patch

Cord

BACKPROBE SET

07SAZ - 001000A (Two required)

CAUTION:

• Puncturing the insulation on a wire can cause poor or intermittent electrical connections.

• Bring the tester probe into contact with the terminal from the terminal side of wire harness connectors in the engine

compartment. For female connectors, just touch lightly with the tester probe and do not insert the probe.

TESTER PROBE

RUBBER SEAL

WIRE HARNESS

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PGM-FI Syste m
System Descriptio n (cont'd )
3. Fue l Cut-of f Contro l
• Durin g deceleratio n wit h th e throttl e valv e closed , curren t t o th e injector s i s cu t of f t o improv e fue l econom y a t
speed s ove r 1,00 0 rpm .
• Fue l cut-of f actio n als o take s plac e whe n engin e spee d exceed s 5,90 0 rpm , regardles s o f th e positio n o f th e throttl e
valve, t o protec t th e engin e fro m over-revving .
4. A/ C Compresso r Clutc h Rela y
Whe n th e PC M receive s a deman d fo r coolin g fro m th e ai r conditionin g system , i t delay s th e compresso r fro m bein g
energized , an d enriche s th e mixtur e to assur e a smoot h transitio n t o th e A/ C mode .
5 . Evaporativ e Emissio n (EVAP ) Control .
Whe n th e engin e coolan t temperatur e i s abov e 99° F (37°C) : '9 6 - 9 9 models , 140° F (60°C) : '0 0 - 0 4 models , th e PC M
control s th e EVA P caniste r purg e valv e whic h control s vacuu m to th e EVA P canister .
6 . Intak e Manifol d Runne r Contro l (IMRC )
Whe n engin e spee d i s belo w 3,20 0 rpm , th e IMR C Solenoi d Valv e 1 an d IMR C Solenoi d Valv e 2 ar e activate d b y a sig -
na l fro m th e PCM . Intak e ai r flow s throug h a lon g chambe r path , increasin g torqu e a t lo w RPM .
Whe n engin e spee d is 3,20 0 - 3,80 0 rpm , th e IMR C Solenoi d Valv e is deactivate d b y th e PCM . Intak e ai r flow s throug h a
shor t chambe r path , increasin g mid-rang e torque .
Whe n th e engin e rp m is abov e 3,80 0 rpm , th e IMR C Solenoi d Valv e 1 an d IMR C Solenoi d Valv e 2 ar e deactivate d b y th e
PCM . Thi s create s a ver y shor t intak e pat h an d increase s high-spee d torque .
7 . Exhaus t Ga s Recirculatio n (EGR ) Contro l
Whe n th e EG R is require d fo r contro l o f oxide s o f nitroge n (NOx ) emissions , th e PC M control s th e EG R contro l valv e
vacuu m solenoi d valv e whic h supplie s regulate d vacuu m to th e EG R valve .
EC M Fail-safe/Back-u p Function s
1. Fail-saf e Functio n
When a n abnormalit y occur s i n a signa l fro m a sensor , th e PC M ignore s tha t signa l an d assume s a pre-programme d
valu e fo r tha t senso r tha t allow s th e engine to continu e t o run .
2 . Back-u p Functio n
Whe n a n abnormalit y occur s i n th e PC M itself , th e fue l injector s ar e controlle d b y a back-u p circui t independen t o f th e
syste m in orde r t o permi t minima l driving .
3 . Self-diagnosi s Functio n [Malfunctio n Indicato r Lam p (MIL) ]
Whe n a n abnormalit y occur s i n a signa l fro m a sensor , th e PC M supplie s groun d fo r th e MI L an d store s th e DT C in
erasabl e memory . Whe n th e ignitio n i s initiall y turne d on , th e PC M supplie s groun d fo r th e MI L fo r 2 second s t o chec k
the MI L bul b condition .
4. Tw o Tri p Detectio n Metho d ('9 6 - 9 7 models )
T o preven t fals e indications , th e Tw o Tri p Detectio n Metho d i s use d fo r th e HO2S , fue l metering-related , idl e contro l
system , EC T sensor , EG R syste m self-diagnosti c function s an d EVA P contro l system . Whe n a n abnormalit y occurs , th e
PC M store s i t i n it s memory . Whe n th e sam e abnormalit y recur s afte r th e ignitio n switc h i s turne d OF F an d O N (II )
again , th e PC M inform s th e drive r b y lightin g th e MIL .
However , t o eas e troubleshooting , thi s functio n i s cancelle d whe n yo u shor t th e servic e chec k connector . Th e MI L wil l
the n blin k immediatel y whe n a n abnormalit y occurs .
5 . Tw o Drivin g Cycl e Detectio n Metho d ('9 6 - 9 7 models )
A "Drivin g Cycle " consist s o f startin g th e engine , beginnin g close d loo p operation , an d stoppin g th e engine . I f misfir -
in g tha t increase s emissions , EVA P contro l syste m malfunctio n o r TW C deterioratio n i s detecte d durin g tw o consecu -
tiv e drivin g cycles , th e PC M turn s th e MI L on .
However , t o eas e troubleshooting , thi s functio n i s cancelle d whe n yo u shor t th e servic e chec k connector . Th e MI L wil l
the n blin k immediatel y whe n a n abnormalit y occurs .
6 . Tw o Drivin g Cycl e Detectio n Metho d ('9 8 - 0 4 models )
T o preven t fals e indications , th e "tw o drivin g cycl e detectio n method " i s use d fo r th e HO2S , fue l metering-related , idl e
contro l system , EC T sensor , EG R system , TW C an d EVA P contro l syste m an d othe r self-diagnosti c functions . Whe n a n
abnormalit y occurs , th e PC M store s it i n it s memory . Whe n th e sam e abnormalit y recur s afte r switc h is turne d OF F an d
O N (II ) again , th e PC M inform s th e drive r b y turnin g o n th e MIL .
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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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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
Brake Peda l Positio n Switc h Signa l
Are th e brak e light s o n withou t
depressin g th e brak e pedal ? Inspec
t th e brak e peda l positio n
switc h (se e sectio n 19 ).
N O
Depres s th e brak e pedal .
D o th e brak e light s com e on ?
YES
Is th e fus e OK ?NO
Chec k fo r a n ope n i n th e wir e
(BKS W line) :
1 . Depres s th e brak e pedal .
2 . Measur e voltag e betwee n PC M
connecto r terminal s E 2 an d
A2 6 wit h th e brak e peda l de -
pressed . —
Repai r shor t i n th e wire be-
twee n th e brak e peda l posi -
tio n switc h an d th e STO P
HOR N (1 5 A ) fuse .
— Replac e th e STO P HOR N (1 5 A )
fuse .
Wire sid e o f femal e terminal s
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e PC M (E2 ) an d th e brak e peda l
positio n switch .
Brak e peda l positio n switc h sig -
nal i s OK .
YES
NO
— Repai r ope n i n th e wir e be -
twee n th e brak e peda l posi -
tio n switc h an d th e STO P
HOR N (1 5 A ) fuse .
— Inspec t th e brak e peda l posi -
tio n switc h (se e sectio n 19 ).
PC M CONNECTOR S
YES
NOInspec t th e STO P HOR N (1 5 A )
fus e i n th e under-hoo d fuse / rela y
box.
YES
Inspectio n o f Brak e Peda l Positio n
Switc h Signal .
This signal s th e PC M whe n th e brak e peda l i s depressed .
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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