engine ACURA RL KA9 1996 Service Repair Manual

The EC T Senso r i s a temperatur e dependen t resisto r (thermistor) . Th e resistanc e o f th e thermisto r decrease s a s th e engin e
coolan t temperatur e increase s a s show n below .
THERMISTO R
ENGINE COOLAN T TEMPERATUR E
NOTE: I f DT C P011 7 and/o r P011 8 ar e store d a t th e sam e tim e a s DT C P0116 , troubleshoo t thos e DTC s first , the n trou -
bleshoo t DT C P0116 .
Possibl e Caus e
• EC T senso r deterioratio n
• Malfunctio n i n th e thermosta t an d th e coolin g syste m
Troubleshootin g Flowchar t
ls176-200°F (80 - 93°C)
indicated?Intermitten t failure , syste m is O Kat thi s time . Chec k th e thermo -stat an d th e coolin g system .
NO
Chec k th e thermosta t an d thecoolin g system . I f the y ar e OK ,replac e th e EC T sensor .
YES
RESISTANC E
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0116 : A range/performanc e proble m in th e Engin e
Coolan t Temperatur e (ECT ) senso r circuit .
Engine Coolan t Temperatur e (ECT ) Senso r
ProCarManuals.com

PGM-FI Syste m
Engine Coolan t Temperatur e (ECT ) Senso r (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0117 : A lo w voltag e (hig h temperature ) proble m in th e
Engin e Coolan t Temperatur e (ECT ) senso r circuit .
— Th e MI L ha s bee n reporte d on .
— DT C P011 7 is stored .
Proble m verification :
1. Tur n th e ignitio n switc h O N (II) .2. Chec k th e EC T wit h th e sca ntool.
ls302° F (150°C ) o r highe r (o r
H-Limi t i n Hond a mod e o f
PG M Tester ) o r 0 V indicated ?
YES
Chec k fo r a shor t i n th e EC T sen -sor:1. Disconnec t th e EC T senso r
connector .
2 . Chec k th e EC T wit h th e sca n
tool.
ls302° F (150°C ) o r highe r (o r
H-Limi t i n Hond a mod e o f
PG M Tester ) o r 0 V indicated ?
YES
Chec k fo r a shor t i n th e wir e
(EC T line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PC M connec -
tor D (22P) .3. Chec k fo r continuit y betwee nNo. 2 termina l o n th e EC Tsenso r connecto r an d bod y
ground .
NO
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 4 (locate d a t lef t shoc k tower) ,
C12 8 (EC T sensor) , C53 1 (climat e
contro l unit ) an d PCM .
Replac e th e EC T sensor .
ECT SENSO R CONNECTO R (C128 )
I s ther e continuity ?
YES
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 nor -
ma l EC T is indicated , replac e th e
origina l PCM .
Wire sid e o f femal e terminal s
Is ther e continuity ? Repai
r shor t i n th e wir e betwee nPCM (D7 ) an d EC T sensor .
Replace th e climat e contro l unit .
NO
YE S
Chec k th e climat e contro l uni tcircuits :1. Tur n th e ignitio n switc h OFF .2. Disconnec t 20 P connecto r
fro m th e climat e contro l unit .
3 . Chec k fo r continuit y betwee n
No . 2 termina l o n th e EC T
senso r connecto r an d bod y
ground .
NO
ProCarManuals.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 )
ProCarManuals.com

PGM-FI Syste m
Throttle Positio n (TP ) Senso r (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0123 : A hig h voltag e proble m in th e Throttl e Positio n
(TP) senso r circuit .
Is ther e abou t 0. 5 V whe n
th e throttl e i s full y close d
an d approx . 4. 5 V whe n th e
throttl e is full y opened ?
NO
Chec k fo r a n ope n in th e T P sen -sor: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 . 3 termina l an d No . 1 ter -
mina l o n th e harnes s sid e o f
the T P senso r connector .
Is ther e abou t 5 V ?
NO
Chec k fo r a n ope n i n th e wir e
(SG 2 line) :
Measur e voltag e betwee n PC M
connecto r terminal s D2 1 an d D22 .
I s ther e abou t 5 V ?
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 i s no w available ,
replac e th e origina l PCM . T
P SENSO R CONNECTO R (C113 )
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 ,
C253 , C25 4 (locate d a t lef t shoc k
tower ) C11 3 (T P sensor ) an d PCM .
Wire sid e o f femal e terminal s
Replac e th e throttl e body . PC
M CONNECTO R D (22P )
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
PCM (D22 ) an d T P sensor .
YES
YE S
YE
S
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. Tur n th e ignitio n switc h O N (II) .
3 . Chec k th e throttl e positio n
wit h th e sca n tool .
—
Th e MI L ha s bee n reporte d on .
— DT C P012 3 is stored .
ProCarManuals.com

PGM-FI Syste m
Primar y Heate d Oxyge n Senso r (HO2S ) (Senso r 1 )
Th e Heate d Oxyge n Sensor s (HO2S ) detec t th e oxyge n conten t i n th e exhaus t ga s an d signa l th e PCM . I n operation , th e
PC M receive s th e signal s fro m th e senso r an d varie s th e duratio n durin g whic h fue l i s injected . T o stabiliz e th e sensor' s
output, th e senso r ha s a n interna l heater . Th e Righ t Primar y HO2 S (Ban k 1 , Senso r 1 ) i s installe d in th e righ t exhaus t man -
ifold, an d th e Lef t Primar y HO2 S (Ban k 2 , Senso r 1 ) i s installe d in th e lef t exhaus t manifold .
ZIRCONIAELEMENT
SENSORTERMINA L
®e
VOLTAG E (V )
HEATE R
STOICHIOMETRI CAIR-FUEL RATI O
HEATE RTERMINA LRICHAIR -FUE LRATI O
LEAN
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0131 : A lo w voltag e proble m in th e Righ t Primar y
Heated Oxyge n Senso r (HO2S ) (Ban k 1 , Senso r 1 ) circuit .
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0151 : A lo w voltag e proble m in th e Lef t Primar y
Heated Oxyge n Senso r (HO2S ) (Ban k 2 , Senso r 1 ) circuit .
— Th e MI L ha s bee n reporte d on .
— DT C P013 1 and/o r P015 1 ar e
stored .
Doe s th e voltag e sta y a t 0. 5 V
o r less ?
Is i t normal ?
(T o pag e 11-85 )
NO
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 4 (locate d a t lef t shoc k tower )
C11 9 (righ t primar y HO2 S (Ban k
1 , Senso r 1) ) o r C12 6 (lef t prima -
r y HO2 S (Ban k 2 , Senso r 1)) * an d
PCM .
Repai r fue l suppl y system .
*: P015 1
NO
YE S
Chec k th e fue l pressure .
YES
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2 . Star t th e engine . Hol d th e
engin e a t 3,00 0 rp m wit h n oloa d (in Par k or neutral ) untilthe radiato r fa n come s on .
3 . Test-driv e wit h th e transmis -
sion in position .
4 . Chec k th e righ t primar y HO2 S
(Ban k 1 , Senso r 1 ) o r lef t pri -
mar y HO2S * (Ban k 2 , Senso r
1 ) outpu t voltag e wit h th e sca n
too l durin g acceleratio n usin g
wid e ope n throttle .
ProCarManuals.com

PGM-FI Syste m
Primar y Heate d Oxyge n Senso r (HO2S ) (Senso r 1 ) (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0132 : A hig h voltag e proble m in th e Righ t Primar y
Heated Oxyge n Senso r (Righ t Primar y HO2S ) (Ban k 1 , Senso r 1 ) circuit .
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0152 : A hig h voltag e proble m in th e Lef t Primar yHeated Oxyge n Senso r (Lef t Primar y HO2S ) (Ban k 2 , Senso r 1 ) circuit .
— Th e MI L ha s bee n reporte d on .
— DT C P013 2 and/o r P015 2 ar e
stored .
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2 .
Start the engine. Hold the enginea t 3,00 0 rp m wit h n o loa d (i nPar k o r neutral ) unti l th e radia -
torfancomeson .
3. Test-driv e wit h th e transmis -sion in position .4. Chec k th e righ t primar y HO2 S
(Ban k 1 , Senso r 1 ) o r lef t primar y
HO2S * (Ban k 2 , Senso r 1 ) out -
pu t voltag e wit h th e sca n too l
durin g deceleratio n usin g com -
pletel y close d throttle .
Doe s th e voltag e sta y a t 0. 9 V
o r more ?
YES
Chec k fo r a n ope n in th e HO2S :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e righ t primar yHO2S (Ban k 1 , Senso r 1 ) o r lef t
primar y HO2S * (Ban k 2 , Sen -
so r 1 (connector .
3. Instal l a jumpe r wir e o n th eharnes s sid e o f th e righ t primar y
HO2 S (Ban k 1 , Senso r 1 ) o r lef t
primar y HO2S * connecto r
betwee n terminal s No . 1 an d
No. 2 .4. Tur n th e ignitio n switc h O N (II) .
5 . Chec k th e righ t primar y HO2 S
(Ban k 1 , Senso r 1 ) o r lef t pri -
mar y HO2S *
(Bank 2, Sensor 1)outpu t voltag e wit h th e sca n tool .
I s ther e 0. 9 V or more ?
YES
Chec k fo r a n ope n i n th e wire s
(PO2 S line) :
1. Tur n th e ignitio n switc h OFF .2. Instal l a jumpe r wir e o n th ePC M connecto r betwee n D19 ,or D18 * and D22 .3. Tur n th e ignitio n switc h O N (II) .4. Chec k th e righ t primar y HO2 S
(Ban k 1 , Senso r 1 ) o r lef t pri -
mar y HO2S * (Ban k 2 , Senso r 1 )
outpu t voltag e wit h th e sca n tool .
I s ther e 0. 9 V or more ?
YES
Substitut e a known-goo d PC M an d
rechec k (se e pag e 11-42 fo r immo -
bilize r information) . I f symp -
tom/indicatio n goe s away , replac e
th e origina l PCM .
NO
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 4 (locate d a t lef t shoc k tower) ,
C11 9 (righ t primar y HO2 S (Ban k 1 ,
Senso r 1) ) o r C12 6 (lef t primar y
HO2 S (Ban k 2 , Senso r 1)) *
RIGH T PRIMAR Y HO2 S (Ban k 1 , Senso r 1 ) CONNECTO R (C119 )
o r LEF T PRIMAR Y HO2 S (Ban k 2 , Senso r 1 ) CONNECTO R (C126 )
JUMPE R WIR E
Replac e th e HO2S . Wir
e sid e o f femal e terminal s
PC M CONNECTO R D (22P )
Repai r ope n i n th e wir e betwee n
PCM (D1 9 o r D18* ) an d righ t pri -mar y HO2 S (Ban k 1 , Senso r 1 ) o r
lef t primar y HO2S * (Ban k 2 ,
Senso r 1) . Wir
e sid e o f femal e terminal s
* : P015 2NO
N
O
JUMPE RWIRE
ProCarManuals.com

The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0133 : A slo w respons e proble m in th e Righ t Primar y
Heate d Oxyge n Senso r (Righ t Primar y HO2S ) (Ban k 1 , Senso r 1 ) circuit .
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0153 : A slo w respons e proble m in th e Lef t Primar y
Heate d Oxyge n Senso r (Lef t Primar y HO2S ) (Ban k 2 , Senso r 1 ) circuit .
Descriptio n
B y controllin g th e air/fue l rati o wit h a Primar y HO2 S (Senso r 1 ) an d a Secondar y HO2 S (Senso r 2) , th e deterioratio n o f th e
Primar y HO2 S (Senso r 1 ) ca n b e evaluate d b y it s feedbac k period . Whe n th e feedbac k perio d o f th e HO2 S exceed s a certai n
valu e durin g stabl e drivin g conditions , th e senso r wil l b e judge d a s deteriorated . Whe n deterioratio n ha s bee n detecte d dur -
in g tw o consecutiv e trips , th e MI L come s o n an d DT C P013 3 o r P015 3 wil l b e stored .
NOTE : I f DT C P0131 , P013 2 and/o r P013 5 ar e store d a t th e sam e tim e a s DT C P0133 , troubleshoo t thos e DTC s first , the n
troubleshoo t DT C P0133 . I f DT C P0151 , P015 2 and/o r P015 5 ar e store d a t th e sam e tim e a s DT C P0153 , troubleshoo t thos e
DTC s first , the n troubleshoo t DT C P0153 .
Is DT C P013 3 and/o r P015 3
indicated ?
YES
Replace the primary HO2S (Sen-
sor 1).
NO
Intermitten t failure , syste m is O Kat thi s time . Chec k fo r poo r con -nection s o r loos e wire s a t C251 ,
C25 4 (locate d a t lef t shoc k tower) ,
C11 9 (righ t primar y HO2 S (Ban k 1 ,
Senso r 1) ) o r C12 6 (lef t primar y
HO2 S (Ban k 2 , Senso r 1)) * an d
PCM .
*: P015 3
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2 . Star t th e engine . Hol d th e
engin 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 .
3 . Connec t th e SC S servic e con -
nector .
4 . Test-driv e unde r followin g
conditions .— 5 5 mp h (8 8 km/h ) stead y
spee d
— Transmissio n i n posi -tion— Unti l readines s cod e come son
Possibl e Caus e
• Primar y HO2 S (Senso r 1 ) Deterioratio n
• Primar y HO2 S Heate r (Senso r 1 ) Deterioratio n
• Exhaus t syste m leakag e
Troubleshootin g Flowchar t
— Th e MI L ha s bee n reporte d on .
— DT C P013 3 and/o r P015 3
stored.
ProCarManuals.com

PGM-FI Syste m
Secondar y Heate d Oxyge n Senso r (HO2S ) (Senso r 2 )
Th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0137 : A lo w voltag e proble m in th e Secondar y Heate d
Oxygen Senso r (Secondar y HO2S ) (Senso r 2 ) circuit .
— Th e MI L ha s bee n reporte d on .
— DT C P013 7 is stored .
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2. 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 .
3 . Chec k th e secondar y HO2 S
(Senso r 2 ) outpu t voltag e wit hthe sca n too l a t 3,00 0 rpm .
Doe s th e voltag e sta y a t 0. 3 V
o r less ?
YES
Chec k fo r a shor t i n th e HO2S :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e secondar y
HO2 S (Senso r 2 ) connector .
3 . Star t th e engine .
4 . Chec k th e secondar y HO2 S
(Senso r 2 ) outpu t wit h th e sca n
tool.
Doe s th e voltag e sta y a t 0. 3 Vor less ?
YES
Chec k fo r a shor t i n th e wir e(SO2 S line) :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PC M connec -tor F (8P) .3. Chec k fo r continuit y betwee nNo. 1 termina l o n th e second -ary HO2 S (Senso r 2 ) connec -tor an d bod y ground .
Is ther e continuity ?
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 symp -
tom/indicatio n goe s away , replac e
th e origina l PCM .
NO
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 C44 4
(locate d behin d righ t kic k panel) ,
C61 0 (secondar y HO2 S (Senso r
2)) an d PCM .
Replac e th e HO2 S (Senso r 2) .
SECONDAR YHO2S (Senso r 2 ) CONNECTO R (C610 )
SHO2S(WHT /RED)
Repai r shor t i n th e wir e betwee n
PC M (F2 ) an d secondar y HO2 S
(Senso r 2) . Wir
e sid e o f femal e terminal sYES
NO
ProCarManuals.com

The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0138 : A hig h voltag e proble m in th e Secondar y Heate d
Oxygen Senso r (HO2S ) (Senso r 2 ) circuit .
— Th e MI L ha s bee n reporte d on .
— DT C P013 8 is stored .
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2 . Star t th e engine . Hol d th e
engin 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 .
3 . Chec k th e secondar y HO2 S
(Senso r 2 ) outpu t a t 3,00 0 rp m
voltag e wit h th e sca n tool .
Doe s th e voltag e sta y a t 0. 6 V
o r more ?
YES
Chec k fo r a n ope n in th e HO2S :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e secondar y
HO2 S (Senso r 2 ) connector .
3 . Instal l a jumpe r wire betwee n
th e secondar y HO2 S (Senso r 2 )
connecto r (harnes s side ) No . 1
termina l an d No . 2 terminal .
4. Tur n th e ignitio n switc h O N (II) .5. Chec k th e secondar y HO2 S
(Senso r 2 ) outpu t voltag e wit h
th e sca n tool .
I s ther e 0. 6 V or more ?
YES
Chec k fo r a n ope n i n th e wir e
(SO2 S line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Instal l a jumpe r wir e betwee n
the PC M connecto r terminal sF2 an d F6 .3. Tur n th e ignitio n switc h O N (II) .
4 . Chec k th e secondar y HO2 S
(Senso r 2 ) outpu t voltag e wit h
the sca n tool .
Is ther e 0. 6 V or more ?
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
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 C44 4
(locate d behin d righ t kic k panel) ,
C61 0 (secondar y HO2 S (Senso r
2)) an d PCM .
SECONDAR Y HO2 S (Senso r 2 ) CONNECTO R (C610 )
SHO2 S
(WHT /RED)
SO2S GN D(GRN/WHT )
Wire sid e o f femal e terminal s
Replac e th e secondar y HO2 S (Sen -
sor 2) .
JUMPE RWIRE
SO2S GN D(GRN/WHT )
Repair ope n i n th e wir e betwee nPCM (F2 ) o r (F6 ) an d secondar yHO2S (Senso r 2) . Wir
e sid e o f femal e terminal s
NO
PC M CONNECTO R F (8P )
SO2 S(WHT/RED )
JUMPER WIR E
ProCarManuals.com

PGM-FI System

Secondary Heated Oxygen Sensor (HO2S) (Sensor 2) (cont'd)

Does the voltage stay within

0.3 - 0.6 V for 2 minutes?
NO
Intermittent failure, system is OK

at this time. Check for poor con-

nections or loose wires at C444

(located behind right kick panel),

C610 (secondary HO2S (Sensor

2)) and
PCM.
The scan tool indicates Diagnostic Trouble Code (DTC) P0139: A slow response problem in the Secondary

Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) circuit.

— The MIL has been reported on.

— DTC P0139 is stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Start the engine. Hold the

engine at 3,000 rpm with no

load (in Park or neutral) until

the radiator fan comes on.

3. Check the secondary HO2S

(Sensor 2) or output at 3,000

rpm with the scan tool.

Replace the secondary HO2S (Sen-

sor 2).
YESProCarManuals.com