1996 ACURA RL KA9 ignition

The scan tool indicates Diagnostic Trouble Code (DTC) P1128: Manifold Absolute Pressure (MAP) lower than

expected.

— The MIL has been reported on.

— DTC P1128 is stored.

Problem verification:

1. Turn the ignition switch ON (II).

2. Check the MAP with the scan

tool.

Is 54.1 kPa (406 mmHg, 16.0

in.Hg) or higher indicated?
Intermittent failure, system is OK

at this time.

The scan tool indicates Diagnostic Trouble Code (DTC) P1129: Manifold Absolute Pressure (MAP) higher than

expected.

Is 43.3 kPa (325 mmHg, 12.8

in.Hg) or less indicated?
Intermittent failure, system is OK

at this time.

Replace the MAP sensor.
NO
YES
Problem verification:

1. 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.

2. Check the MAP with the scan

tool.
— The MIL has been reported on.

— DTC P1129 is stored.
Replace the MAP sensor.
NO
YESProCarManuals.com

PGM-FI Syste m
Throttl e Positio n (TP ) Senso r
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0122 : A lo w voltag e proble m in th e Throttl e Positio n
(TP) senso r circuit .
The T P Senso r i s a potentiometer . I t i s connecte d t o th e throttl e valv e shaft . A s th e throttl e positio n changes , th e throttl e
position senso r varie s th e voltag e signa l t o th e PCM .
— Th e MI L ha s bee n reporte d on .
— DT C P012 2 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 (i n Par k o r neutral ) unti l
th e radiato r fa n come s on ,
the n tur n th e ignitio n switc h
OFF.2. Turn the ignition switch ON (II).3. Chec k th e throttl e positio n
wit h th e sca n tool .
I s ther e approx . 10 % whe n
the throttl e is full y close dand approx . 90 % whe n th e
throttl e is full y opened ?
NO
Chec k fo r a n ope n i n the wire
(VCC 2 line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e T P senso r con -
nector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n
No. 1 termina l an d No . 3 termi -nal o n th e T P senso r connector . BRUS
H
HOLDE R
BRUS H
RESISTO R
YES
Is ther e abou t 5 V ?NO
YE S
Chec k fo r a n ope n o r shor t i n T Psensor :1. Tur n th e ignitio n switc h OFF .
2 . Measur e resistanc e betwee n
No . 1 termina l an d No . 2 ter -
mina l o n th e senso r sid e o f
T P senso r connecto r wit h th e
throttl e full y closed .
(T o pag e 11-81 )
*: wit h TC S*1: wit h VS A TERMINA
L
INNERBUSHIN GIDLEFUL LTHROTTL E
THROTTLEOPENING
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 C11 3
(T P sensor ) C251 , C253 , C25 4
(locate d a t lef t shoc k tower) ,
C62 3 (TC S contro l unit) * C45 0
(VS A converte r unit)*
1 an d PCM . T
P SENSO R CONNECTO R (C113 )
Wir e sid e o f femal e terminal s
Chec k fo r a n ope n in wir e (VCC2 ,
line):Measur e voltag e betwee n D2 1
termina l an d D2 2 termina l o n th e
PC M connector . Wir
e sid e o f femal e terminal s
I s ther e abou t 5 V ? Repai
r ope n in th e wir e betwee n
PCM (D21 ) an d T P sensor .
NO
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 pre -
scribe d voltag e is no w available ,
replac e th e origina l PCM .Termina l sid e o fmal e terminal s
YES
PCM CONNECTO R D (22P )
OUTPU
T VOLTAG E (V )
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The scan tool indicates Diagnostic Trouble Code (DTC) P1121: Throttle Position (TP) lower than expected.

— The MIL has been reported on.

— DTC P1121 is stored.

Problem verification:

1. Turn the ignition switch ON (II).

2. Check the throttle position

with the scan tool.

I
s 14.4% or higher indicated when

the throttle is fully opened?
Intermittent failure, system is OK

at this time.

The scan tool indicates Diagnostic Trouble Code (DTC) P1122: Throttle Position (TP) higher than expected.

— The MIL has been reported on.

— DTC P1122 is stored.

Problem verification:

1. Turn the ignition switch ON (II).

2. Check the throttle position

with the scan tool.

Is 19.1% or less indicated when

the throttle is fully closed?
Intermittent failure, system is OK

at this time.

Replace the TP sensor.
NO
YES
Replace the TP sensor.
NO
YESProCarManuals.com

PGM-FI System

Fuel Supply System (cont'd)

— The MIL has been reported on.

— DTC P0171, P0172, P0174 and/

or P0175 are stored.

Check the fuel pressure.

Is the fuel pressure OK?
NO

YES

Check the Primary HO2S:

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. Check the right primary or left

primary* HO2S (Sensor 1) out-

put with the scan tool.
Is the fuel pressure too high

or too low?
Check the fuel pressure regulator

and fuel return pipe.

LOW

Check the fuel pump, fuel feed

pipe, fuel filter, and fuel pressure

regulator.

Does it stay at less than 0.3 V

or more than 0.6 V?
Replace the HO2S.

NO

Check for a sticking or leaking

EVAP canister purge valve:

With a vacuum pump, apply vacu-

um to the EVAP canister purge

valve from the intake manifold

side.

Does it hold vacuum?

('96 model only)
Replace the EVAP canister purge

valve.

YES

Check the MAP sensor output:

1. Turn the ignition switch ON (II).

2. Check the MAP with the scan

tool.

Does it indicate atmospheric

pressure?
YES

*: P0174 or P0175
Check the response of the MAP

sensor:

1. Start the engine.

2. Check the MAP with the scan

tool.

Is a MAP of 40.0 kPa (300 mmHg,

12.0 inHg) or less indicated within

one second after starting the

engine?
Replace the MAP sensor.

YES

Check the EGR system. If it is OK,

replace the fuel injectors.
NO
NO

Replace the MAP sensor.
NO
YES
HIGH
Troubleshooting FlowchartProCarManuals.com

PGM-FI System

Misfire Detected in One Cylinder

The scan tool indicates Diagnostic Trouble Code (DTC) P1203 or P1303: Cylinder 3 misfire detected.

The scan tool indicates Diagnostic Trouble Code (DTC) P1204 or P1304: Cylinder 4 misfire detected.

The scan tool indicates Diagnostic Trouble Code (DTC) P1205 or P1305: Cylinder 5 misfire detected.

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.

P0106*1, P1128*2, P1129*2: MAP sensor

P0171, P0172, P0174, P0175: Fuel supply system

P0401, P1491, P1498: EGR system

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

P0335, P0336, P1336, P1337: CKP sensor

P1381, P1382, P1386, P1387: CYP sensor

*1: '96 model only

*2: '97 - 01 models

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
or

The scan tool indicates Diagnostic Trouble Code (DTC) P1206 or P1306: Cylinder 6 misfire detected.
or
or
or
The scan tool indicates Diagnostic Trouble Code (DTC) P1201 or P1301: Cylinder 1 misfire detected.

The scan tool indicates Diagnostic Trouble Code (DTC) P1202 or P1302: Cylinder 2 misfire detected.
or
orProCarManuals.com

PGM-FI Syste m
Rando m Misfir e
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0300*3,
P1300*4 an d som e o f P120 1 - P120 6 o r som e o f P130 1 - P1306 :
Rando m misfire .
Descriptio n
Misfir e 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
P1300*3 o r P0300*4, 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 . Then , afte r
misfir e ha s 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 i s O N (II) .
I f misfirin g tha t increase s emission s i s detecte d durin g tw o consecutiv e drivin g cycles , th e MI L wil l com e on , an d DT C
P1300*
3 o r P0300*4, 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 .
P0106*1, P1128*2, P1129*2: MA P senso r
P0171 , P0172 , P0174 , P0175 : Fue l meterin g
P0401 , P1491 , PU98 : EG R syste m
P0335 , P0336 , P1336 , P1337 , P1381 , P1382 , P1386 , P1387 : CKP/CY P senso r
P0505 : Idl e Contro l Syste m
PI508 : IA C valv e
*1 : '9 6 mode l onl y
*2 : '9 7 - 0 1 model s
*3: '9 6 - 9 7 model s
*4: '9 8 - 0 1 model s
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
Ignition contro l modul e malfunction
MA P senso r range/performance , poo r response*1
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 durin g whic h 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 .
11-166 11-69 section 4 section 4 section 6 11-102
and
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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

Electrical Troubleshootin g
Troubleshooting Flowchar t — Interloc k Syste m — Ke y Interloc k Syste m
Inspectio n o f th e ke y interloc k sys -tem.
Chec k Ke y Interloc k Solenoi d
Operation :
1 . Disconnec t th e ignitio n switc h
connecto r (8P) .
2 . Connec t th e No . 5 termina l o f
th e ignitio n switc h connecto r t o
th e batter y positiv e terminal ,
and connec t th e No . 4 termi -nal t o th e batter y negativ e ter -
minal .
3 . Chec k th e ke y interloc k solenoi d
operation . A clickin g soun d
shoul d b e heard .
Doe s th e ke y interloc k
solenoi d operat e properly ?
Chec k Ke y Interloc k Switc h Oper -
ation :
1 . Connec t th e No . 8 termina l o f
th e ignitio n switc h connecto r
t o th e batter y positiv e termi -
nal , an d connec t th e No . 4 ter -
mina l t o th e batter y negativ e
terminal.2. Tur n th e ignitio n switc h t o
AC C (I) , the n pus h it .
3 . Chec k th e ke y interloc k solenoi d
operation . A clickin g soun d
should b e hear d whil e push -ing th e ignitio n key , an d n osoun d shoul d b e hear d whe n
releasin g th e ignitio n key .
Doe s th e ke y interloc k
solenoi d operat e properly ?
T o pag e 14-8 5
Possibl e Caus e
Ignitio n ke y canno t b e move d
fro m AC C (I ) positio n to LOC K (0 )
positio n whil e pushin g th e igni -
tio n ke y wit h th e shif t leve r i s in
position .
IGNITION SWITC H 8P CONNECTO R
Wir e sid e o f femal e terminal s
Fault y th e ke y interloc k solenoid .
Replac e th e ignitio n ke y cylinder /
steering loc k assembly .
Faulty th e ke y interloc k switch .
Replac e th e ignitio n ke y cylinder /
steerin g loc k assembly .
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