ECU ACURA RL KA9 1996 Service Repair Manual

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0133: A slow response problem in the Right

Primary Heated Oxygen Sensor (Right Primary H02S) (Bank 1, Sensor 1) circuit.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0153: A slow response problem in the Left

Primary Heated Oxygen Sensor (Left Primary HO2S) (Bank 2, Sensor 1) circuit.

Description

By controlling the air/fuel ratio with a Primary HO2S (Sensor 1) and a Secondary HO2S (Sensor 2), the deterioration of the

Primary H02S (Sensor 1) can be evaluated by its feedback period. When the feedback period of the H02S exceeds a certain

value during stable driving conditions, the sensor will be judged as deteriorated. When deterioration has been detected dur-

ing two consecutive trips, the MIL comes on and DTC P0133 or P0153 will be stored.

NOTE: If DTC P2195, P0134, P2297 and/or P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first,

then troubleshoot DTC P0133. If DTC P2197, P0154, P2298 and/or P0155 are stored at the same time as DTC P0153, trou-

bleshoot those DTCs first, then troubleshoot DTC P0153.

Possible Cause

• Primary HO2S (Sensor 1) Deterioration

• Primary H02S Heater (Sensor 1) Deterioration

• Exhaust system leakage
Primary Heated Oxygen Sensor (HO2S) (Sensor 1)

The Heated Oxygen Sensors (HO2S) detect the oxygen content in the exhaust gas and signal the PCM. In operation, the

PCM receives the signals from the sensor and varies the duration during which fuel is injected. To stabilize the sensor's

output, the sensor has an internal heater. The Right Primary HO2S (Bank 1, Sensor 1) is installed in the right exhaust man-

ifold, and the Left Primary HO2S (Bank 2, Sensor 1) is installed in the left exhaust manifold.ProCarManuals.com

Fuel Supply System

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0171: The fuel system is too lean [Right

Bank (Bank 1)].

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0172: The fuel system is too rich [Right

Bank (Bank 1)].

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0174: The fuel system is too lean [Left Bank

(Bank 2)].

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0175: The fuel system is too rich [Left Bank

(Bank 2)].

Description

By monitoring the Long Term Fuel Trim, long term malfunctions in the fuel system will be detected.

If a
malfunction
has
been detected
during
two
consecutive
trips,
the MIL
will
come
on and DTC
P0171,
P0172, P0174

and/or P0175 will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as DTC P0171, P0172, P0174 and/or P0175, trou-

bleshoot those DTCs first, then troubleshoot DTC P0171, P0172, P0174 and/or P0175.

P0107, P0108, P1128, P1129: MAP Sensor

P0135: Right Primary HO2S Heater (Bank 1, Sensor 1)

P0137, P0138: Secondary HO2S (Sensor 2)

P0141: Secondary HO2S Heater (Sensor 2)

P0155: Left Primary H02S Heater (Bank 2, Sensor 1)

P0401: EGR Flow Insufficient

P0404: EGR Valve Lift Insufficient

P0406: EGR Valve Position Sensor High Voltage

Possible Cause

Fuel Pump insufficient flow/pressure

Fuel Feed Line clogged, leaking

Fuel Pressure Regulator stuck open

Fuel Filter clogged

Injector clogged, air inclusion

Gasoline doesn't meet Owner's Manual spec.

Primary H02S (Sensor 1) deteriorated

EGR System insufficient flow

Exhaust leak

Fuel Pressure Regulator clogged, stuck closed

Fuel Return Pipe clogged

Injector leaking

Gasoline doesn't meet Owner's Manual spec.

Primary HO2S (Sensor 1) deteriorated

EGR System malfunction (too much flow)

EVAP Canister Purge Valve leaking, stuck opened

(cont'd)ProCarManuals.com

Random Misfir e
The HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0300 , an d
som e o f P120 1 - P120 6 o r som e o f P130 1 - P1306 : Rando m misfire .
Descriptio n
Misfire detectio n i s accomplishe d b y monitorin g th e voltag e o f th e spar k plu g wit h th e spar k plu g voltag e senso r whic h i s
buil t i n to th e ignitio n coil .
If misfirin g stron g enoug h t o damag e th e catalys t i s detected , th e MI L wil l blin k durin g th e tim e o f it s occurrence , an d DT C
P0300 , som e
of DTC s P120 1 throug h P1206 or som e of DTC s P130 1 throug h P1306 will be stored . Then , after misfir e has
ceased , th e MI L wil l com e o n an d sta y o n wheneve r th e ignitio n switc h is O N (II) .
I f misfirin g tha t increase s emission s i s detecte d during two consecutiv e drivin g cycles , th e MI L wil l com e on , an d DT C
P0300 , som e o f DTC s P120 1 throug h P120 6 o r som e o f DTC s P130 1 throug h P130 6 wil l b e stored .
NOTE : I f som e o f th e DTC s liste d belo w ar e store d a t th e sam e tim e a s a misfir e DTC , troubleshoo t thos e DTC s first , the n
troubleshoo t th e misfir e DTC .
P1128 , P1129 : MA P senso r
P0171 , P0172 , P0174 , P0175 : Fue l meterin g
P0401 , P0404 , P0406 : EG R syste m
P0345 , P0349 , P0390 , P0394 , P1336 , P1337 , P1386 , P1387 : CKP/CM P (CKP/CYP ) senso r
P0506 , P0507 : Idl e Contro l Syste m
P0511 : IA C valv e
Possibl e Caus e
Fuel pum p insufficien t fue l pressure , amoun t o f flo w
Fue l lin e clogging , blockage , leakag e
Fue l filte r cloggin g
Fue l pressur e regulato r stuc k ope n
EG R syste m malfunctio n
Ignitio n coi l wir e open , leakag e
Ignitio n contro l modul e malfunctio n
IA C valv e malfunctio n
Fas t idl e therm o valv e malfunctio n
Carbo n deposit s o n valve s
Compressio n lo w
Gasolin e doe s no t mee t Owner' s Manua l spec. , lac k o f fue l
Troubleshootin g
By test-driving , determin e th e condition s during which misfir e occurs . Dependin g o n thes e conditions , tes t i n th e orde r
describe d i n th e tabl e below .
NOTE : I f misfir e doesn' t recur , som e possibl e cause s ar e fue l tha t doesn' t mee t owner' s manua l spec , lac k o f fuel , carbo n
deposit s o n spar k plug , etc .
11-8 5 sectio n 4 section 4
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PGM-FI System

Description

Misfire detection is accomplished by monitoring the voltage of the spark plug with the spark plug voltage sensor which is

built into the ignition coil.

If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and a

misfire DTC will be stored. Then, after the misfire has ceased, the MIL will come on and stay on whenever the ignition

switch is ON (II).

If misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and a misfire

DTC will be stored.

NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then

troubleshoot the misfire DTC.

P1128, P1129: MAP sensor

P0171, P0172, P0174, P0175: Fuel supply system

P0401, P0404, P0406: EGR system

P1316, P1317, P1318, P1319: Spark Plug Voltage Detection System

P0345, P0349, P1336, P1337: CKP sensor

P0390, P0394, P1386, P1387: CMP (CYP) sensor

Possible Cause

Injector clogging, fuel leakage, air leakage

Injector circuit open or shorted

Injector resistor malfunction

Spark plug carbon deposits, fouling, malfunction

Ignition coil malfunction

ICM malfunction

Compression low

11-60
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1201 or P1301: Cylinder 1 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1202 or P1302: Cylinder 2 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1203 or P1303: Cylinder 3 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1204 or P1304: Cylinder 4 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1205 or P1305: Cylinder 5 mis-

fire detected.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1206 or P1306: Cylinder 6 mis-

fire detected.
Misfire Detected in One CylinderProCarManuals.com

Electrical Troubleshootin g
Troubleshooting Flowchar t — Vehicl e Spee d Senso r (VSS )
• OB D II Sca n Too l indicate s Cod e
P0501 .
• Self-diagnosi s indicato r ligh t
blink s fou r times .
Possibl e Caus e
• Disconnecte d vehicl e spee dsenso r (VSS ) connecto r
• Shor t o r ope n in VS S wir e
• Fault y VS S
Chec k tha t th e speedomete r oper -
ate s correctly .
Doe s th e speedomete r operate ? Refe
r t o
section 23 fo r vehicl e
spee d senso r (VSS ) test .
YES
• Mak e sur e lifts , jack s an d safet y stand s ar e place d properl y (se e section 1).
• Se t th e parkin g brak e securely , an d bloc k th e rea r wheels .
• Jac k u p th e fron t o f th e vehicle , an d suppor t i t wit h safet y stands .
Doe s O V and approx . 5 V or mor e
appea r alternately ?
YES
Chec k fo r ope n i n th e wir e
betwee n th e B1 3 termina l an d
th e vehicl e spee d senso r (VSS) . I f
wir e i s OK , chec k th e VS S (se e
section 23).
Chec k fo r loos e PC M connectors .
I f necessary , substitut e a known -
goo d PC M an d recheck .
Chec
k th e VS S Voltage :
1. Tur n th e ignitio n switc h OFF .2. Rais e th e vehicle .
3 . Shif t th e transmissio n t o
position .4. Disconnec t th e A (26P ) an d B(16P ) connector s fro m th ePCM .5. Tur n th e ignitio n switc h O N (II) .
6 . Rotat e th e fron t whee l an d
chec k fo r th e voltag e betwee n
th e B1 3 an d A2 6 terminals .
NOTE : Bloc k th e othe r whee l
s o i t doe s no t tur n o r yo u wil l
get incorrec t tes t results .
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6. Remove the clips and roof trim, detach the rear

clips, then remove the headliner.

FASTENER

HEADLINER

JOINT
ROOF

TRIM

7. Remove the headliner through the passenger's door

opening.

8. Installation is the reverse of the removal procedure,

and note these items:

• When inserting the headliner through the door

opening, be careful not to fold or bend it. Also, be

careful not to scratch the body.

• Check that both sides of the headliner are

securely attached to the trim.

• When installing the roof trim, install the joint

toward the rear.

• Make sure each connector is plugged in properly.ProCarManuals.com

Power Lumba r Suppor t Replacemen t
SRS component s ar e locate d i n thi s area . Revie w th e
SR S
componen t locations an d precaution s an d proce -
dure s i n th e SR S sectio n befor e performin g repai r o r
service . Refe r t o th e
'99 - 0 1 Acur a 3. 5 R L Servic e
Manual , P/ N 61SZ305 .
CAUTION :
• Pu t o n glove s t o protec t you r hands .
• Whe n pryin g wit h a flat-ti p screwdriver , wra p i t wit h
protectiv e tap e t o preven t damage .
NOTE:
• Tak e car e no t t o ben d th e cable .
• Tak e car e no t t o tea r th e seam s o r damag e th e sea t
covers .
1. Remov e th e bac k cove r (se e pag e 20-4).
2 . Releas e th e hoo k stri p o n th e righ t insid e o f th e
seat-back .
HOOK STRI P
LUMBA R SUPPOR T
MOTO R
SEAT-BAC K COVE R
3. Disconnec t th e lumba r suppor t moto r connector ,
an d remov e th e bolt s securin g th e lumba r suppor t
motor.
LUMBA R SUPPOR T
MOTO R
6x 1. 0 m m9.8 N- m (1. 0 kgf-m ,7.2 Ibf-ft )
LUMBA R SUPPOR T
MOTO R
CONNECTO R
4. Remov e th e lumba r support , cable , an d moto r a s a n
assembly .
- 1 Pul l bac k th e edg e of the seat-bac k cove r an d
pa d a s needed .
- 2 Releas e th e wir e tie .
- 3 Releas e bot h lowe r springs .
-4 Releas e th e lumba r suppor t fro m bot h uppe r
springs .
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Front Seat

Power Lumbar Support Replacement

(cont'd)

5. Install the lumbar support in the reverse order of

removal, and note these items:

• Replace the wire ties as news ones.

• To prevent wrinkles when installing a seat-back

cover, make sure the material is stretched evenly

over the pad before securing the hook strip.

• Replace the back panel clips as new ones.

20-6ProCarManuals.com

Front Sea t
Seat Cove r Replacemen t (cont'd )
7. Instal l th e cove r i n th e revers e orde r of removal ,
and not e thes e items :
• T o preven t wrinkle s whe n installin g a seat-bac k
cover , mak e sur e th e materia l i s stretche d evenl y
ove r th e pa d befor e securin g th e clips , hooks ,
an d hoo k strips .
• Replac e an y clip s yo u remove d wit h ne w ones .
Instal l the m wit h commerciall y availabl e uphol -
stery ring pliers .
• Reinstal l th e hook s o f th e reinforcein g clot h
securely .
• Us e onl y origina l Hond a o r Acur a replacemen t
seat-back covers.
• Passenger' s seat : Reinitializ e th e OPD S contro l
unit . Refe r t o th e '9 9 - 0 1 Acur a 3. 5 R L Servic e
Manual , P/ N 61SZ30 5 (se e sectio n 24 ).
CLI P
UPHOLSTER Y
RIN G PLIER S
HOO K
HOO K
REINFORCEIN G
CLOT H SEAT-BAC K FRAM E HOO
K
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Navigation Syste m
Genera l Troubleshootin g Informatio n
General Operatio n
Refer t o th e Acur a Navigatio n Syste m Owner' s manua l
fo r th e navigatio n syste m operatin g procedures .
Anti-theft Featur e
The navigatio n syste m ha s a code d thef t protectio n cir -
cuit . B e sur e t o ge t th e customer' s 4-digi t securit y cod e
numbe r before :
• disconnectin g th e batter y
• disconnectin g th e navigatio n uni t 8 P connecto r
• removin g th e No . 5 6 (7.5A ) fus e fro m th e under-hoo d
fuse/rela y bo x
Afte r service , reconnec t powe r t o th e navigatio n unit ,
an d tur n th e ignitio n switc h O N (II) . Ente r th e 4-digi t
securit y code , the n selec t "Done" .
I f th e cod e canno t b e found , us e th e interactiv e Networ k
( iN ) t o loo k i t up . Yo u wil l nee d th e seria l numbe r fo r
th e navigatio n uni t i n th e trunk . I t i s o n a ta g o n th e
undersid e o f th e unit . Alternatively , yo u ca n vie w th e
seria l numbe r i n on e o f th e Nav i EC U diagnosti c
screens.
When replacin g th e navigatio n unit , b e sur e t o giv e th e
custome r th e ne w anti-thef t securit y code .
Sympto m Diagnosi s
Under som e circumstances , th e navigatio n syste m ma y
behav e in a n inconsisten t manner . Som e customer s ma y
thin k tha t thi s indicate s a proble m when , i n fact , th e
syste m is workin g properly . Kee p th e followin g item s i n
min d whe n interviewin g customer s abou t symptom s
o f th e navigatio n system .
Self-lnertia l Navigatio n Limitation s
When GP S signal s canno t b e receive d (lik e in a tunne l o r
i n a n urba n environmen t o f tal l buildings) , th e syste m is
totall y dependan t o n th e ya w rat e an d spee d senso r t o
positio n th e vehicl e o h th e map . Unde r thes e circum -
stance s smal l error s i n th e ya w rat e an d spee d senso r
ca n accumulat e an d displa y th e vehicl e positio n o n a n
adjacen t street , o r laggin g behin d th e actua l position .
Thi s i s normal , an d usuall y correct s itsel f onc e sate -
llit e receptio n is re-established .
Th e followin g circumstance s ma y cause s vehicl e posi -
tionin g errors . •
Movin g th e vehicl e wit h th e navigatio n syste m o n an d
th e vehicl e stopped , suc h a s b y ferr y o r to w truck , o r i f
th e vehicl e is spu n o n a tur n tabl e
• Tir e slippage , change s i n tir e rollin g diameters , an d
som e drivin g situation s ma y caus e discrepancie s i n
trave l distances . Example s o f thi s include :
- Continuou s tir e slippag e o n a slipper y surfac e
- Drivin g wit h sno w chain s mounte d
-Abnorma l tir e pressur e
- Incorrec t tir e siz e
- Frequen t lan e change s acros s a wid e highwa y
-Continuou s drivin g o n a straigh t o r gentl y curvin g
highwa y
• Tolerance s i n th e syste m an d ma p inaccuracie s some -
times limi t ho w precisel y th e vehicl e positio n i s indi -
cated . Example s o f thi s include :
- Drivin g o n road s no t show n o n th e ma p (ma p match -
in g i s no t possible )
- Drivin g o n a roa d tha t wind s i n on e direction , suc h a s
a loo p bridge , a n interchange , o r a spira l parkin g
garage
-Drivin g o n a roa d wit h a serie s o f shar p hair-pi n
turn s
- Drivin g nea r a gradua l highwa y exi t o r transitio n
- Drivin g o n on e o f tw o close paralle l road s
- Makin g man y 9 0 degre e turn s
Globa l Positionin g Syste m (GPS ) Limitation s
The GP S canno t detec t th e vehicle' s positio n durin g th e
followin g instances :
• Fo r th e firs t 5 to 1 0 minute s afte r reconnectin g th e bat -
ter y (thi s ca n tak e a s lon g a s 4 5 minutes )
• Whe n th e satellit e signal s ar e blocke d b y tal l building ,
mountains , tunnels , larg e trees , o r larg e truck s
• Whe n ther e i s n o satellit e signa l outpu t (Signa l outpu t
i s sometime s stoppe d fo r satellit e servicing )
• Whe n th e satellit e signal s ar e blocke d b y th e operatio n
of som e electroni c aftermarke t accessorie s including ,
but no t limite d t o non-DE M in-das h entertainmen t
unit s (radio , C D players/changers , an d L o Jack ) an d
windo w tintin g abov e th e GP S antenn a
Th e accurac y o f GP S is reduce d durin g thes e instances :
• Whe n onl y tw o satellit e signal s ca n b e receive d (Thre e
satellit e signal s ar e require d fo r accurat e positioning )
• Whe n th e satellit e contro l center s ar e experiencin g
problem s
• Whe n drivin g hea r hig h tensio n powe r lines .
• Whe n drivin g nea r tal l building s tha t reflec t satellit e
signals , creatin g fals e positio n locatio n readings .
• I f electroni c GP S jammin g i s occurrin g eithe r inten -
tionally , o r unintentionally .
• I f loos e item s o r pet s ar e restin g abov e th e antenn a
o n th e rea r shelf .
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