ACURA NSX 1997 Service Repair Manual

DTC(MI L indication )
P0700P071 5P0720P072 5 (70) *P0730P074 0P0753P075 8
P1106 (13 )
P110 7 (13 )
P110 8 (13 )
P112 8
(5 )
P1129 (5 )
P1201 7 1P1202 7 2
P120 3 7 3
P120 4 7 4
P120 5 7 5
P1206 7 6
P1241 (40 )
P1242 (40 )
P1243 (40 )
P1244 (40 )
P1246 (37 )
P1247 (37 )
P1248 (37 )
P1259 (52 )
Detection Ite m
Automati cTransaxle
Barometri cPressure Circui t
Range/Performanc e Proble m
Barometri cPressure Circui t
Lo w Inpu t
Barometri cPressure Circui t
Hig h Inpu t
Manifol d Absolut e Pressur e
Lowe r Tha n Expecte d
Manifol d Absolut e Pressur e
Highe r Tha n Expecte d
— Cylinde r 1
— Cylinde r 2
— Cylinde r 3
— Cylinde r 4
— Cylinde r 5
— Cylinde r 6
Misfir e Detecte d
Throttl e Valv e Contro l
Moto r Circui t 1
Malfunctio n
Throttl e Valv e Contro l
Motor Circui t 2Malfunctio n
Throttl e Positio n
Insufficien t
Close d Throttl e Positio n
Insufficien t
Accelerato r Positio n
Senso r 1 Circui t
Malfunctio n
Accelerato r Positio n
Senso r 2 Circui t
Malfunctio n
Accelerato r Positio n
Senso r 1 an d 2
Incorrec t Correlatio n
VTE C Syste m
Malfunctio n[Rear Ban k (Ban k 1) ]
Probabl e Caus e
• EC M (Bar o sensor )
• EC M (Bar o sensor )
• EC M (Bar o sensor )
• MA P senso r
• MA P senso r
Fue l injecto r
Fue l injecto r circui t
Ignitio n syste m
Lo w compressio n
Valve clearanc e
• Ope n o r shor t i n Throttl e Valv e Contro l
Moto r circui t 1
• Throttl e Valv e Contro l Moto r
•ECM
• Ope n o r shor t i n Throttl e Valv e Contro lMotor circui t 2• Throttl e Valv e Contro l Moto r•ECM
• Throttl e Valv e
• T P senso r
• Throttl e Valv e Contro l Moto r
• Throttl e Valv e
• T P senso r
• Ope n o r shor t i n Accelerato r Positio n
senso r 1 circui t
• Accelerato r Positio n senso r
•ECM
• Ope n o r shor t i n Accelerato r Positio n
senso r 2 circui t
• Accelerato r Positio n senso r
•ECM
• Accelerato r Positio n senso r
• Ope n o r shor t i n Rea r VTE C Solenoi d
Valve circui t• Rea r VTE C Solenoi d Valv e• Ope n o r shor t i n Rea r VTE C Pressur e
Switc h circui t
• Rea r VTE C Pressur e Switc h•ECM
Page
Sectio n 1 4
11-10 3
11-103
11-10 3
11-68
11-6 8
11-90
11-10 9
11-10 9
11-111
11-11 1
11-11 4
11-114
11-114
Sectio n 6
(cont'd )
ProCarManuals.com

DTC(MI L indication ) Detectio n Ite m
P127 9 (22 )
717 2
P130 0 7
374
7 5
76
P130 1 7 1
P1302 7 2
P130 3 7 3
P130 4 7 4
P130 5 7 5
P1306 7 6
P1316 (79 )
P131 7 (79 )
P131 8 (79 )
P131 9 (79 )
P1336 (54 )
P133 7 (54 )
P1381 (9 )
P1382 (9 )
P138 6 (59 )
P138 7 (59 )VTE
C Syste m
Malfunctio n
[Front Ban k (Ban k 2) ]
Rando m Misfir e
— Cylinde r 1
— Cylinde r 2
— Cylinder s
— Cylinde r 4
— Cylinde r 5
— Cylinde r 6
Misfir e
Detecte d
Spar k Plu g Voltag e
Detectio n Circui t
Malfunctio n
[Front Ban k (Ban k 2) ]
Spar k Plu g Voltag e
Detectio n Circui tMalfunctio n
[Rear Ban k (Ban k 1) ]
Spar k Plu g Voltag e
Detectio n Modul e Rese t
Circui t Malfunctio n
[Fron t Ban k (Ban k 2) ]
Spar k Plu g Voltag e
Detectio n Modul e Rese t
Circuit Malfunctio n
[Rear Ban k (Ban k 1) ]
Crankshaf t Positio n
Senso r B
Range/Performanc e
Crankshaft Positio n
Senso r B Circui t
Low Inpu t
Cylinde r Positio n
Sensor A
Intermitten t Interruptio n
Cylinder Positio n
Senso r A N o Signa l
Cylinde r Positio n
Senso r B
Intermitten t Interruptio n
Cylinder Positio n
Senso r B N o Signa l Probabl
e Caus e Pag e
• Ope n o r shor t i n Fron t VTE C Solenoi d
Valve circui t
• Fron t VTE C Solenoi d Valv e
• Ope n o r shor t i n Fron t VTE C Pressur e
Switc h circui t
• Fron t VTE C Pressur e Switc h
• EC M
• Ignitio n syste m
• Fue l suppl y syste m
• MA P senso r
• EG R syste m
• Contaminate d fue l
• Lac k o f fue l
• Ignitio n syste m
• Ope n o r shor t i n Spar k Plu g Voltag e
Detectio n Modul e circui t
• Spar k Plu g Voltag e Detectio n Modul e
•EC M
• Ope n o r shor t i n Spar k Plu g Voltag e
Detectio n Modul e circui t
• Spar k Plu g Voltag e Detectio n Modul e• EC M
• Ope n o r shor t i n Spar k Plu g Voltag e
Detectio n Modul e Rese t circui t
• Spar k Plu g Voltag e Detectio n Modul e
• EC M
• Ope n o r shor t i n Spar k Plu g Voltag e
Detectio n Modul e Rese t circui t
• Spar k Plu g Voltag e Detectio n Modul e
•EC M
• Crankshaf t Positio n Senso r B
• Timin g bel t skippe d teet h
• Crankshaf t Positio n Senso r B
• Crankshaf t Positio n Senso r B circui t
•ECM
• Cylinde r Positio n Senso r A
• Cylinde r Positio n Senso r A
• Cylinde r Positio n Senso r A circui t
• EC M
• Cylinde r Positio n Senso r B
• Cylinde r Positio n Senso r B
• Cylinde r Positio n Senso r B circui t
• EC M
Sectio n 6
11-9 4
11-90
11-9 6
11-96
11-9 8
11-98
11-10 0
11-10 0
11-10 0
11-10 0
11-10 0
11-10 0
Troubleshootin g
Diagnostic Troubl e Cod e (DTC ) Char t (cont'd )
or
P0300
ProCarManuals.com

DTC(MI L indication )
P1456 (90)* *
P145 7 (90)* *
P1491 (12 )
P1498 (12 )
PI 60 7 (- )
P1608 (- )
P1671 (31 )
P1672 (31 )
P167 6 (35 )
P167 7 (35 )
P1705P1706
P175 3
P175 8P1768
P178 8 (70) *
P179 0
P1791
P179 2
P179 3
P179 5
Detectio n Ite m
Evaporativ e Emissio n Contro l
Syste m Lea k Detecte d (Fue l Tan k
Area )
Evaporativ e Emissio n Contro l
Syste m Lea k Detecte d (EVA P
Contro l Caniste r Area )
EGR Valv e
Lift Insufficien tDetected
EGR Valv eLift Senso r
Hig h Voltag e
Engin e Contro l
Modul e Interna l
Circui t Failur e A
Engin e Contro l
Modul e Interna l
Circui t Failur e 8
A/TF I
Dat a Lin e
N o Signa l
A/TF I
Dat a Lin e
Failur e
TCSF I
Data Lin e
N o Signa l
TCSFI
Data Lin e
Failur e
Automati c
Transaxle
Probable Caus e
• Vacuu m connectio n
• Fue l tan k
• Fue l tan k pressur e senso r
• Fuel fill ca p• EVA P bypas s solenoi d valv e
• EVA P tw o wa y valv e
• EVA P contro l caniste r ven t shu t valv e
• EVA P contro l caniste r
• EVA P purg e contro l solenoi d valv e
• Vacuu m connectio n
• EVA P contro l caniste r
• Fue l tan k pressur e senso r
• EVA P bypas s solenoi d valv e
• EVA P tw o wa y valv e
• EVA P contro l caniste r ven t shu t valv e
• Fue l Tan k
• EVA P purg e contro l solenoi d valv e
• EG R valv e (wit h lif t sensor )
• EG R valv e lif t senso r circui t
• EG R contro l solenoi d valv e
• EG R contro l solenoi d valv e circui t
• EG R lin e•EC M
• EG R valv e (wit h lif t sensor )
• EG R valv e lif t senso r circui t
• EC M
•EC M
• EC M
• A/ T F l Dat a Lin e
•TC M
• EC M
• A/ T F l Dat a Lin e
•TC M
• EC M
• TC S F l Dat a Lin e
• TC S Contro l Uni t• EC M
• TC S F l Dat a Lin e• TC S Contro l Uni t
•EC M Pag
e
11-172 ('97-99)
11-172 ('97-99)
11-163
11-16 5
11-10 4
11-10 4
11-105
11-10 5
Sectio n 1 9
Sectio n 1 9
Sectio n 1 4
*: Th e indicato r ligh t an d th e Malfunctio n Indicato r Lam p (MIL ) ma y com e o n simultaneously .
11-60c ('00-02)
11-65c ('01-02)
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Troubleshooting

How to Read Flowcharts

A flowchart is designed to be used from start to final repair. It's like a map showing you the shortest distance. But beware:

if you go off the "map" anywhere but a "stop" symbol, you can easily get lost.

Describes the conditions or situation to start a troubleshooting flowchart.

Asks you to do something; perform a test, set up a condition etc.

Asks you about the result of an action, then sends you in the appropriate troubleshooting direction.

NOTE:

The term "Intermittent Failure" is used in these charts. It simply means a system may have had a failure, but it checks

out OK at this time. If the Malfunction Indicator Lamp (MIL) on the dash does not come on, check for poor connections

or loose wires at all connectors related to the circuit that you are troubleshooting (see illustration below).

Some of the troubleshooting flowcharts have you reset the Engine Control Module (ECM) and try to duplicate the

Diagnostic Trouble Code (DTC). If the problem is intermittent and you can't duplicate the code, do not continue through

the flowchart. To do so will only result in confusion and, possibly, a needlessly replaced ECM.

"Open" and "Short" are common electrical terms. An open is a break in a wire or at a connection. A short is an acci-

dental connection of a wire to ground or to another wire. In simple electronics, this usually means something won't

work at all. In complex electronics (like ECM's), this can sometimes mean something works, but not the way it's sup-

posed to.

TIGHT

LOOSE
The end of a series of actions and decisions, describes a final repair action and sometimes directs you to

an earlier part of the flowchart to confirm your repair.ProCarManuals.com

PGM-FI Syste m
System Descriptio n
INPUTSENGIN E CONTRO L MODUL E (ECM )OUTPUT S
Front Primar y H02 S
Rea r Primar y HO2 S
Fron t Secondar y HO2 S
Rea r Secondar y H02 S
MA P Senso r
CKP/CY P Senso rECT Senso rTP Senso rAP Senso rIAT Senso rVSSFron t K SRea r K SEG R Valv e Lif t Senso rA/TFI Signal sTCS Signal s
Spar k Plu g Voltag e
Detectio n Modul e Signa l
Starte r Signa l
Brak e Switc h Signa l
AL T F R Signa l
Ai r Conditionin g Signa l
A/ T Gea r Positio n Switc h Signa l
Neutra l Switc h Signa l (M/T )
Clutc h Switc h Signa l (M/T )
VTE C Pressur e Switc h
Batter y Voltag e (IGN . 1 )
Fue l Tan k Pressur e Senso r
Cruis e Contro l Mai n Switc h Signa l
Se t Switc h Signa l
Resum e Switc h Signa l Fue
l Injector s
PGM-F I M.ai n Rela y (Fue l Pump )
Malfunctio n Indicato r Lam p
Throttl e Valv e Contro l Moto r
A/ C Compresso r Clutc h Rela y
ICMEVA P Purg e Contro l Solenoi d Valv e
EVA P Bypas s Solenoi d Valv e
EVA P Contro l Caniste r
Ven t Shu t Valv e
Fue l Pum p Rela y
EG R Contro l Solenoi d Valv e
IA B Contro l Solenoi d Valv e
VTE C Solenoi d Valve s
Fron t Primar y H02 S Heate r
Rea r Primar y H02 S Heate r
Fron t Secondar y H02 S Heate r
Rea r Secondar y H02 S Heate r
Cruis e Contro l Indicato r Ligh t
Revers e Lockou t Rela y
DLC
PGM-F I Syste m
Th e PGM-F I syste m o n thi s mode l i s a sequentia l multipor t fue l injectio n system .
Fue l Injecto r Timin g an d Duratio n
Th e EC M contain s memorie s fo r th e basi c discharg e duration s a t variou s engin e speed s an d manifol d pressures . Th e
basi c discharg e duration , afte r bein g rea d ou t fro m th e memory , i s furthe r modifie d b y signal s sen t fro m variou s sensor s
t o obtai n th e fina l discharg e duration .
Throttl e Valv e Contro l
Th e EC M control s th e throttl e valv e contro l moto r base d o n accelerato r peda l position , TC S contro l uni t signals , an d vari -
ou s othe r signals . Th e EC M als o control s th e idl e contro l function , cruis e contro l function , an d othe r function s wit h th e
throttl e valv e control .
Ignitio n Timin g Contro l
Th e EC M contain s memorie s fo r basi c ignitio n timin g a t variou s engin e speed s an d manifol d pressures . Ignitio n timin g
i s als o adjuste d fo r engin e coolan t temperature .
A knoc k contro l syste m is als o used . Whe n detonatio n i s detecte d b y th e knoc k senso r (KS) , th e ignitio n timin g i s
retarded .
Other Contro l Function s
1 . Startin g Contro l
Whe n th e engin e is started , th e EC M provide s a ric h mixtur e b y increasin g fue l injecto r duration .
2 . Fue l Pum p Contro l
Whe n th e ignitio n switc h i s initiall y turne d o n (II) , th e EC M supplie s groun d t o th e PGM-F I mai n rela y tha t supplie s
curren t t o th e fue l pum p fo r tw o second s t o pressuriz e th e fue l system .
Whe n th e engin e is running , th e EC M supplie s groun d to th e PGM-F I mai n rela y tha t supplie s curren t t o th e fue l pump .
Whe n th e engin e i s no t runnin g an d th e ignitio n i s on , th e EC M cut s groun d t o th e PGM-F I mai n rela y whic h cut s
curren t t o th e fue l pump .
Excellen t engin e performanc e is achieve d throug h th e us e o f VTE C (Variabl e Valv e Timin g an d Valv e Lif t Electroni c
Contro l System) , intak e ai r bypas s contro l an d discharg e volum e contro l o f th e fue l pump .
(cont'd )
ProCarManuals.com

PGM-FI System

System Description (cont'd)

3. Fuel Cut-off Control

During deceleration with the throttle valve closed, current to the fuel injectors is cut off to improve fuel economy at

speeds over 1,500 rpm.

Fuel cut-off action also takes place when engine speed exceeds 8,300 rpm, regardless of the position of the throttle

valve, to protect the engine from over-revving.

4. A/C Compressor Clutch Relay

When the ECM receives a demand for cooling from the air conditioning system, it delays the compressor from being

energized, and enriches the mixture to assure smooth translation to the A/C mode.

5. Evaporative Emission (EVAP) Purge Control Solenoid Valve

When the engine coolant temperature is below 153°F (67°C), the ECM controls the EVAP purge control solenoid valve

which cuts vacuum to the EVAP purge control canister diaphragm.

6. Intake Air Bypass (IAB) Control Solenoid Valve

When the engine speed is below 4,800 rpm, the IAB control solenoid valve is activated by a signal from the ECM. Intake

air then flows through the smaller chamber, and high torque is delivered. To increase air flow at engine speeds higher

than 4,800 rpm, the solenoid valve is deactivated by the ECM, and the intake air flows through the larger chamber.

7. Exhaust Gas Recirculation (EGR) Control Solenoid Valve

When the EGR is required for control of oxides of nitrogen (NOx) emissions, the ECM supplies ground to the EGR

control solenoid valve which supplies regulated vacuum to the EGR valve.

ECM Fail-safe/Back-up Functions

1. Fail-Safe Function

When an abnormality occurs in a signal from a sensor, the ECM ignores that signal and assumes a pre-programmed

valve for that sensor that allows the engine to continue to run.

2. Back-up Function

When an abnormality occurs in the ECM itself, the fuel injectors are controlled by a back-up circuit independent of the

system in order to permit minimal driving.

3. Self-diagnosis Function [Malfunction Indicator Lamp (MIL)]

When an abnormality occurs in a signal from a sensor, the ECM lights the MIL and stores the diagnostic trouble code

in erasable memory. When the ignition is initially turned on, the ECM supplies ground for the MIL for two seconds to

check the MIL bulb condition.

4. Two Trip Detection Method

To prevent false indications, the Two Trip Detection Method is used for the H02S, fuel metering-related, idle control

system, ECT sensor, EGR system self-diagnostic functions and EVAP control system. When an abnormality occurs,

the ECM stores it in its memory. When the same abnormality recurs after the ignition switch is turned OFF and ON (II)

again, the ECM informs the driver by lighting the MIL.

However, to ease troubleshooting, this function is cancelled when you short the service check connector. The MIL will

then blink immediately when an abnormality occurs.

5. Two (or three) Driving Cycle Detection Method

A "Driving Cycle" consists of starting the engine, beginning closed loop operation, and stopping the engine. If misfir-

ing that increases emissions or EVAP control system malfunction is detected during two consecutive driving cycles,

or TWC deterioration is detected during three consecutive driving cycles, the ECM turns the MIL on.

However,
to
ease
troubleshooting,
this
function
is
cancelled when
you
short
the
service check connector.
The MIL
will

then blink immediately when an abnormality occurs.ProCarManuals.com

Engine Contro l Modul e (ECM )
NOTE: I f thi s sympto m is intermittent , chec k fo r a loos e No . 5 BACK-U P LIGHTS , ALTERNATOR ,
TUR N SIGNAL S (1 5 A ) fus e in th e under-das h fuse/rela y box , a poo r connectio n a t EC M termina l
A7 , o r a n intermitten t ope n in th e BL U wir e betwee n th e EC M (A7 ) an d th e gaug e assembly .
I s th e lo w oi l pressur e ligh t on ?
Tr y t o star t th e engine .
Doe s th e engin e start ?
Chec k fo r a n ope n in th e wir e o r
bulb :
1. Tur n th e ignitio n switc h OFF .2. Connec t th e EC M connecto r
termina l A 7 t o bod y groun d
with a jumpe r wire .3. Tur n th e ignitio n switc h O N (II) .
Is th e MI L on ?
Substitut e a known-goo d ECM ,
an d rechec k (se e pag e 11-3 9 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
the origina l ECM .
— Repai r shor t i n the wir e
betwee n No . 5 BACK-U P
LIGHTS , ALTERNATOR , TUR N
SIGNAL S (1 5 A ) fus e an d
gaug e assembly .
— Replac e No . 5 BACK-U P
LIGHTS , ALTERNATOR , TUR N
SIGNALS (15 A) fuse.
Chec k fo r a n ope n in th e wire s
(PG lines) :1. Tur n th e ignitio n switc h O N (II) .
2 . Measur e voltag e betwee n
bod y groun d an d EC M con -
necto r terminal s A1 2 an d A2 5
individually .
I s ther e les s tha n 1. 0 V ?
Substitut e a known-goo d EC M
an d rechec k (se e pag e 11-3 9 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
th e origina l ECM . Repai
r ope n i n th e wire(s )
betwee n EC M an d G10 1 (locate d
a t intak e manifold ) tha t ha d
mor e tha n 1.0V .
— Repai r ope n i n th e wire s
betwee n EC M (A7 ) an d gaug e
assembly .— Replac e th e MI L bulb .
(cont'd )
Turn th e ignitio n switc h O N (II) .
The Malfunctio n Indicato r Lam p
(MIL ) neve r come s o n (eve n fo r
tw o seconds ) afte r ignitio n i s
turne d O N (II) .
ProCarManuals.com

PGM-FI Syste m
Engine Contro l Modul e (ECM ) (cont'd )
The Malfunctio n Indicato r Lam p
(MIL ) stay s o n o r come s o n afte r
tw o seconds .
Chec k th e Diagnosti c Troubl e
Code (DTC) :1. Connec t a sca n too l o r Hond a
PG M Tester .
2. Tur n th e ignitio n switc h O N (II) .3. Rea d th e DT C wit h th e sca n
too l o r Hond a PG M Tester .
NOTE:• Whe n ther e is n o Diagnosti c Troubl e Cod e (DTC ) stored , th e MI L wil l sta y o n if th e SC S servic e
connecto r i s connecte d an d th e ignitio n switc h i s on .
• I f thi s sympto m is intermittent , chec k for :
— A loos e ACG(S ) (2 0 A ) fus e in th e engin e compartmen t fuse/rela y bo x
— A loos e No . 2 FUE L PUM P SRS 2 (1 5 A ) fus e in th e under-das h fus e bo x
— A n intermitten t shor t i n th e wire betwee n th e EC M (C5 ) an d th e servic e chec k connecto r
— A n intermitten t ope n i n th e wire s betwee n th e EC M (A26 , B14 ) an d th e servic e chec k con -
necto r
— A n intermitten t shor t i n th e wire betwee n th e EC 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 EC M (F1 ) an d th e MA P sensor , accelerato r posi -
tion senso r— A n intermitten t shor t i n th e wir e betwee n th e EC M (D10 ) an d th e T P sensor , EG R valv e lif tsenso r— A n intermitten t shor t i n th e wire betwee n th e EC M (F14 ) an d accelerato r positio n senso r
• Se e th e OB D II sca n too l o r Hond a PG M Teste r user' s manual s fo r specifi c operatin g instruc -
tions.
Are an y DTC(s ) indicated ? G
o t o troubleshootin g proce -
dures , (se e pag e 11-38 )
Chec k th e DT C b y MI L indication :
1. Tur n th e ignitio n switc h OFF .2. Connec t th e SC S servic e con -
necto r t o th e servic e chec k
connector .
3. Tur n th e ignitio n switc h O N (II) .
Doe s th e MI L indicat e an y DTC ? —
Repai r ope n o r shor t i n wir e
betwee n the ECM (D4 ) an d
Dat a Lin k Connector .
— G o t o troubleshootin g proce -
dures , (se e pag e 11-38 )
Try t o star t th e engine .
Does th e engin e start ?
Chec k fo r a shor t i n th e wir e
(SC S line) :
1 . Sto p th e engin e an d tur n th e
ignitio n switc h O N (II) .2. Measur e voltag e betwee n th e
EC M connecto r termina l C 5
an d bod y ground . (T
o pag e 11-63 )
I s ther e approx . 5 V ?
(T o pag e 11-63 ) Repai
r shor t t o bod y groun d i n
th e wir e betwee n EC M (C5 ) an d
servic e chec k connector .
ProCarManuals.com

(From pag e 11-62 )
Chec k fo r a shor t i n th e wir e (MI L
line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EC M connec -
to r A (26P) .
3. Tur n th e ignitio n switc h O N (II) .
Is th e MI L ON ?Repai r shor t t o bod y groun d i n
th e wir e betwee n th e EC M (A7 )
and MIL .
Substitut e a known-goo d EC M
an d rechec k (se e pag e 11-3 9 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
the origina l ECM .
(From pag e 11-62 )
Inspec t ACG(S ) (2 0 A ) fus e i n th e
engin e compartmen t fuse/rela ybox.
Is th e fus e OK ? Repai
r shor t i n th e wir e
betwee n ACG(S ) (2 0 A ) fus e
an d PGM-F I mai n relay .
Replac e ACG(S ) (2 0 A ) fuse .
Inspec t I G COI L (3 0 A ) fus e i n th e
engin e compartmen t fuse/rela ybox.
Is th e fus e OK ? Repai
r shor t i n th e wir e
betwee n I G COI L (3 0 A ) fus e
an d PGM-F I mai n relay .
Replac e IG COI L (3 0 A ) fuse .
Chec k fo r a shor t i n a sensor :
1. Tur n th e ignitio n switc h O N (II) .2. Disconnec t th e 3 P connecto r
o f eac h senso r on e a t time :
• MA P senso r
• T P senso r
• EG R valv e lif t senso r• Fue l tan k pressur e senso r
Doe s th e MI L remai n ON ? Replac
e th e senso r tha t cause d
the ligh t t o g o out .
(To pag e 11-64 )(cont'd )
ProCarManuals.com

PGM-FI Syste m
Engine Contro l Modul e (ECM ) (cont'd )
(From pag e 11-63 )
Chec k fo r a shor t i n th e A P sen -
sor:1. Tur n th e ignitio n switc h OFF .2. Connec t th e SC S servic e con -nector .3. Disconnec t th e A P senso r 3 P
connector .
4. Tur n th e ignitio n switc h O N (II) .
Is DT C P124 6 and/o r P124 7
indicated ?
Chec k fo r a shor t i n th e wire s
(VC C lines) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EC M connec -tor D (22P ) an d F (26P) .3. Chec k fo r continuit y betwee nbody groun d an d EC M con -necto r terminal s D10 , F 1 an dF14 individually .
Is ther e continuity ?
I s ther e batter y voltage ?
Chec k fo r a n ope n i n th e wire s
(L G lines) :
1 . Reconnec t al l senso r connec -
tors .
2 . Reconnec t th e EC M connecto r
D (22P ) F (26P) .3. Tur n th e ignitio n switc h O N (II) .4. Measur e voltag e betwee n
bod y groun d an d EC M connec -
tor terminal s A2 6 an d B 9 indi -vidually .
Is ther e les s tha n 1.0V ?
Substitut e a known-goo d EC Mand rechec k (se e pag e 11-3 9 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
th e origina l ECM . Replac
e th e A P sensor .
Repai r shor t t o bod y groun d
in th e wir e betwee n EC M(D10 ) an d throttl e angl e sen -
so r an d EG R valv e lif t sensor .
Repai r shor t t o bod y groun d in
th e wir e betwee n EC M (F1 )and MA P senso r Accelerato r
Positio n senso r o r fue l tan k
pressur e sensor .
Repai r shor t t o bod y groun d in
th e wir e betwee n EC M (F14 )and Accelerato r Positio n sen -sor.
Repai r ope n i n th e wire(s )
betwee n EC M (A13 , C D an d
PGM-F I mai n relay .
Chec k fo r poo r connection s
o r loos e wire s a t th e PGM-F I
mai n relay .
Repai r ope n i n th e wire(s )
between EC M (A26 , B9 ) an dG10 1 tha t ha d mor e tha n 1. 0 V .
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