ACURA RL KA9 1996 Service Repair Manual

Troubleshooting Flowchar t
— Th e MI L ha s bee n reporte d on .
— DT C P120 1 throug h P120 6 o r
P130 1 throug h P130 6 i s indi -
cated .
Proble m verification :
1 . Afte r checkin g th e freez e data ,
d o th e PC M Rese t Procedure .
2 . Connec t th e SC S servic e con -
nector .3. Test-driv e th e ca r severa l time s
i n th e rang e o f th e freez e data .
I s an y misfir e DT C indicated ?
NO
Chec k fo r ignitio n coi l malfunction :
1 . Exchang e th e ignitio n coi l fro m
the proble m cylinde r wit h on efrom anothe r cylinder .
2 . Test-driv e th e ca r severa l time s
i n th e rang e o f th e freez e data .
I s an y misfir e DT C indicated ?
YES
NO
(T o pag e 11-62 )
NOTE:• I f ther e i s n o freez e dat a o f misfiring ,
jus t clea r th e DTC .
• I f ther e i s n o freez e dat a o f misfiring ,
tes t drive s unde r variou s condition s ar e
necessary .
Intermitten t misfir e du e t o spar k
plu g fouling , etc . (firin g i s O K a t
thi s time) .
Replac e th e fault y spar k plug .
Intermitten t misfir e du e t o ba d
contac t i n th e ignitio n coi l con -
necto r (firin g is O K a t thi s time) .
Replac e th e fault y ignitio n coil .
Doe
s th e misfir e occu r i n th e othe r
cylinde r whos e spar k plu g wa s
exchanged ?
Does th e misfir e occu r i n th e othe r
cylinde r whos e ignitio n coi l wa s
exchanged ?
1. Exchang e th e spar k plu g fro mthe proble m cylinde r wit h on eof anothe r cylinder .
2 . Test-driv e th e ca r severa l time s
i n th e rang e o f th e freez e data .
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PGM-FI Syste m
Misfire Detecte d i n On e Cylinde r (cont'd )
(From pag e 11-61 )
Chec k th e injecto r function :
Liste n fo r a clickin g soun d a t th e
injecto r i n th e proble m cylinder .
Does it click ?NO
YE SChec k fo r a n ope n o r shor t i n th e
harnes s betwee n th e PC M an d
th e injector .
Are th e wire s OK ?
Chec k fo r injecto r malfunction :1. Exchang e th e injecto r fro m th eproble m cylinde r wit h on efrom anothe r cylinder .
2 . Le t th e engin e idl e fo r 2 min -
utes.3. Test-driv e th e ca r severa l time s
i n th e rang e o f th e freez e data . Repai
r ope n o r shor t i n th e wire .
NOTE : I f ther e i s n o freez e dat a o f mis -
firing , tes t drive s unde r variou s condi -
tion s ar e necessary .
I s an y misfir e DT C indicated ?
YES
Intermitten t misfir e du e t o ba dcontac t i n th e injecto r connecto r
(firin g is O K a t thi s time) .
Doe s th e misfir e occu r i n th e othe r
cylinde r whos e injecto r wa s
exchanged ?Replace th e fault y injector .
NO
(T o pag e 11-63 ) —
Replac e th e injector .
— Substitut e a known-goo d PC M
an d recheck . I f symptom/indi -
catio n goe s away , replac e th e
origina l PCM .
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(From pag e 11-62 )
Chec k th e ignitio n syste m wir e
harness :Check th e followin g wires :
• betwee n th e PC M an d IC M
• betwee n th e ignitio n coi l an dICM• betwee n th e ignitio n coi l an dbatter y• betwee n th e ignitio n coi l an dspar k plu g voltag e detectio nmodule
(se e Electrica l Connection s an d
sectio n 4 )
Ar e th e wire s OK ?
YES
Chec k fo r IC M malfunction :
Substitut e a known-goo d IC M
and recheck .
Does misfir e occur ? Repai
r shor t o r ope n in th e wire .
Replac e th e ICM .
Chec k th e followin g item s
— Cylinde r leak-dow n
— Compressio n
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PGM-FI Syste m
Crankshaf t Position/Camshaf t Positio n (CKP/CMP ) (Crankshaf t
Position/Cylinde r Positio n (CKP/CYP) ) Senso r
The HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0345 : A malfunctio n i n th e circui t o f th e
Crankshaf t Positio n (CKP ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0349 : A n intermitten t interruptio n proble m of
th e Crankshaf t Positio n (CKP ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0390 : A malfunctio n in th e circui t o f th e Camshaf t
Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 1 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0394 : A n intermitten t interruptio n proble m
o f th e Camshaf t Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 1 .
Th e HD S o r 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 .
I Th e HD S o r 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 HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1386 : A n intermitten t interruptio n proble m
o f th e Camshaf t Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 2 .
Th e HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1387 : A malfunctio n i n th e circui t o f th e
Camshaf t Positio n (CMP ) (Cylinde r Positio n (CYP) ) senso r 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 CM P (CYP ) 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/CM P
(CKP/CYP ) 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 P0345 , P0349 , P0390 ,P0394, P1336 , P1337 , P138 6
and/o r P138 7 ar e stored .
Proble m verification :
1. D o th e PC M Rese t Procedure .2. Star t th e engine .
Check fo r a n ope n i n th e CKP /CMP (CKP/CYP ) sensor :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e CKP/CM P(CKP/CYP) 8 P connector .3. Measur e resistanc e betwee nthe terminal s o f th e indicate dsensor (se e table) .
Is ther e 65 0 - 85 0 fl ?
YE S
Chec k fo r a shor t i n th e CKP /CMP (CKP/CYP ) sensor :Check fo r continuit y t o bod ygroun d o n bot h terminal s o f th eindicate d sensor .
CKP PICK-U PCOIL 2
CM P (CYP ) PICK-U PCOIL 1
N O
Intermitten t failure , syste m is O Kat thi s time . Chec k fo r poo r con -nection s o r loos e terminal s a tC251 , C25 5 (locate d a t righ t shoc ktower) , C13 0 (CKP/CM P (CKP /CYP)) senso r an d PCM .
Replac e th e CKP/CM P (CKP/CYP )sensor (se e sectio n 6) .
CK P PICK-U PCOIL1
CMP (CYP ) PICK-U PCOIL 2
CKP/CM P (CKP/CYP ) SENSO R 8 P CONNECTO R
(To pag e 11-65 )Termina l sid e o f mal e terminal s
Is DT C P0345 , P0349 , P0390 , P0394 ,P1336, P1337 , P138 6 and/o r P138 7indicated ?
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(From pag e 11-64 )
Is ther e continuity ?
NO
Chec k fo r a n ope n i n th e wire s
(CKP/CM P (CKP/CYP ) lines) :
1 . Reconnec t th e CKP/CM P (CKP /
CYP ) 8 P senso r connector .
2 . Disconnec t th e PC M connec -
to r B (16P ) an d D (22P) .
3 . Measur e resistanc e betwee n
th e terminal s o f th e indicate d
senso r o n th e PC M connecto r
(se e table) .
I s ther e 65 0 - 85 0 Ohms ?
YES
Chec k fo r a shor t i n th e wire s
(CKP/CM P (CKP/CYP ) lines) :
Chec k fo r continuit y betwee n PC M
connecto r terminal s B5 , B6 , B7 , B 8
an d bod y ground .
I s ther e continuity ?
NO
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
Replac e th e CKP/CM P (CKP/CYP )
senso r (se e sectio n 6) .
Repai r ope n in th e indicate d sen -
so r wire s (se e table) .
Repai r shor t t o bod y groun d i n
th e indicate d senso r wire s (se e
table) .
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PGM-FI System

PCM Internal Circuit

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0607: A PCM Internal Circuit Failure.

— The MIL has been reported on.

— DTC P0607 is stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Turn the ignition switch ON (II).

3. Allow it to 3 seconds.

Is DTC P0607 indicated?

YES
Intermittent failure, system is OK

at this time.

Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.

11-66ProCarManuals.com

Thermostat

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1486: Range/Performance Problem in

Thermostat.

NOTE: If the DTCs listed below are stored at the same time as DTC P1486, troubleshoot those DTCs first, then recheck for

P1486.

P0107, P0108, P1128, P1129: MAP Sensor

P2227, P2228, P2229: Barometric Pressure Circuit

P1259, P1279: VTEC system

P0401: EGR Flow Insufficient

P0404: EGR Valve Lift Insufficient

P0406: EGR Valve Position Sensor High Voltage

P0125, P0116, P0117, P0118: Engine Coolant Temperature Circuit

P0112, P0113: Intake Air Temperature Circuit

P0345, P0349, P1336, P1337: CKP Sensor 1/2

P0300: Random Misfire

P0301, P0302, P0303, P0304, P0305, P0306: Cylinder 1, 2, 3, 4, 5 or 6 Misfire detected.

P0506, P0507: Idle Control System Malfunction

P0511: Idle Air Control Valve

DTC P1486 can set occasionally when the hood is opened.

Troubleshooting

— The MIL has been reported on.

— DTC P1486 is stored.

1. Turn the ignition Switch OFF.

2. Check the engine coolant

level.

Is the engine coolant level low?

Does the radiator fan keep

running?

YES

Check the radiator fan circuit,

radiator fan switch circuit and

the radiator fan switch.

It they are OK, substitute the

PCM and recheck.

If the symptom/indication goes

away, replace the original PCM.
Refill the engine coolant. If neces-

sary, check the cooling system.

Test the thermostat.
Check for the radiator for circuit:

1. Turn the ignition switch ON

(II).

2. Check the radiator fan.ProCarManuals.com

PGM-FI System

Barometric Pressure (Baro) Sensor

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2227: A range/performance problem in the

Barometric Pressure (BARO) Sensor circuit.

Is DTC P2227 indicated?
Intermittent failure, system is OK

at this time.

YES

Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.
Problem verification:

1. Do the PCM reset procedure.

2. Connect the SCS service con-

nector.

3. Start the engine. Hold the

engine at 3,000 rpm with no

load (in Park or neutral) until

the radiator fan comes on,

then let it idle.

4. Test-drive with the transmis-

sion in position.

5. Accelerate for five seconds

using wide open throttle.
— The MIL has been reported on.

— DTC P2227 is stored.ProCarManuals.com

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2228: A low voltage problem in the Baro

sensor circuit.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P2229: A high voltage problem in the Baro

sensor circuit.

The MIL has been reported on.

DTC P2228 or P2229 is stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Turn the ignition switch ON (II).

Is DTC P2229 indicated?

NO

Is DTC P2228 indicated?

YES

Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.
Substitute a known-good PCM

and recheck. If symptom/indica-

tion goes away, replace the origi-

nal
PCM.

Intermittent failure, system is OK

at this time.ProCarManuals.com

PGM-FI Syste m
MIL Circui t Troubleshootin g
Turn th e ignitio n switc h O N (II )and watc h th e Malfunctio nIndicator Lam p (MIL) .
NOTE:If thi s sympto m is intermittent , chec k fo r th e followin g problems .
• Th e MI L neve r come s o n afte r th e ignitio n switc h i s turne d O N (II) .
— A loos e No . 6 EC U (PCM ) (2 0 A ) fus e in th e under-das h fuse/rela y bo x
— A loos e No . 2 2 FUE L PUM P (2 0 A ) fus e in th e under-das h fuse/rela y bo x
— A n intermitten t shor t i n th e wir e betwee n th e PC M (A7 ) an d th e gaug e assembl y— A n intermitten t shor t i n th e wir e betwee n th e PC M (D10 ) an d th e MA P senso r— A n intermitten t shor t i n th e wire betwee n th e PC M (D21 ) an d th e T P sensor , EG Rvalv e positio n sensor , fue l tan k pressur e sensor , TC S contro l valv e angl e senso r
— A loos e No . 2 5 I G COI L (3 0 A ) fus e in th e under-das h fuse/rela y bo x
— PGM-F I mai n rela y
• Th e MI L stay s o n o r come s o n afte r 2 second s wit h th e ignitio n switc h turne d O N (II) .
— A n intermitten t shor t i n th e wir e betwee n th e PC M (C5 ) an d th e servic e chec k con -nector , dat a lin k connecto r
— A n intermitten t ope n i n th e wir e betwee n th e PC M (D22 ) an d th e servic e chec k connec -
tor— A n intermitten t shor t i n th e wir e betwee n th e PC M (A7 ) an d th e gaug e assembly .
• Se e th e HD S o r th e sca n too l user' s manual s fo r specifi c operatin g instructions .
Doe s th e MI L com e o n an d
sta y on ?
YES
NO
Chec k th e fuse :1. Tur n th e ignitio n switc h OFF .2. Tur n th e ignitio n switc h O N (II ]
Doe s th e lo w oi l pressur eindicator ligh t com e on ?
NO
YE S
Chec k th e engin e starting :
Tr y t o star t th e engine . (T
o pag e 11-73 )
Repai r shor t o r ope n i n th e
wir e betwee n gaug e rela y
an d gaug e assembly .
Repai r shor t o r ope n i n th e
wir e betwee n METE R (15A )
fus e an d gaug e relay .
Repai r shor t o r ope n i n th e
wir e betwee n NO . 1 3 METE R
(7.5A ) fus e an d gaug e relay .
Tes t th e gaug e relay .
Replac e METE R (ISA ) fus e
and/o r No.1 3 METE R (7.5A )fuse.
Does th e engin e start ?YES
NO
(T o pag e 11-71 ) (T
o pag e 11-75 )
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