engine ACURA TL 1995 Service Repair Manual

Fuel Supply System

System Description

The fuel supply system consists of a fuel tank, in-tank

high pressure fuel pump, PGM-FI main relay, fuel filter,

fuel pressure regulator, fuel injectors, and fuel delivery

and return lines. This system delivers pressure-regulat-

ed fuel to the fuel injectors and cuts the fuel delivery

when the engine is not running.

11-124ProCarManuals.com

Inspection (model s wit h servic e bolt )
1 . Reliev e fue l pressur e (se e pag e 11-124 ).
2 . Remov e th e servic e bol t o n th e fue l filte r whil e hold -
in g th e banj o bol t wit h anothe r wrench . Attac h th e
specia l tool .
FUELPRESSUR EGAUGE07406 - 004000 1
FUEL PRESSUR EREGULATO R
CLAMP
3. Star t th e engine . Measur e th e fue l pressur e wit h th e
engin e idlin g an d th e vacuu m hos e o f th e fue l pres -
sure regulato r disconnecte d fro m th e fue l pressur e
regulator an d pinched . I f th e engin e wil l no t start ,
turn th e ignitio n switc h O N (II) , wai t fo r tw o sec -
onds , tur n i t off , the n bac k o n agai n an d rea d th e
fue l pressure .
Pressur e shoul d be :
294 - 34 3 kP a (3. 0 - 3. 5 kgf/cm2, 43-5 0 psi )
4. Reconnec t vacuu m hos e to th e fue l pressur e regula -
tor.
Pressur e shoul d be :
23 0 - 27 9 kP a (2.3 5 - 2.8 5 kgf/cm2,3 3 - 4 1 psi )
I f th e fue l pressur e i s no t a s specified , firs t chec k th e fue l
pum p (se e pag e 11-130 ). I f th e fue l pum p i s OK , chec k
the following :
If th e fue l pressur e i s highe r tha n specified , inspec t for :
— Pinche d o r clogge d fue l retur n hos e o r line .
— Fault y fue l pressur e regulato r (se e pag e 11-128 ).
I f th e fue l pressur e is lowe r tha n specified , inspec t for :
— Clogge d fue l filter .
— Fault y fue l pressur e regulato r (se e pag e 11-128 ).
— Leakag e in th e fue l line . Inspectio
n (model s withou t servic e bolt )
1 . Reliev e fue l pressur e (se e pag e 11-124 ).
2 . Remov e th e 1 2 m m banj o bol t fro m th e fue l filte r
while holdin g th e fue l filte r wit h anothe r wrench .
Attach th e specia l tool .FUELPRESSUR EGAUGE07406 - 004000 1
FUEL PRESSUR EREGULATO R
CLAMP
FUEL PRESSUR E ADAPTE RBOLT, 1 2 m m(9000 8 -PD6 - 010 )
3. Star t th e engine . Measur e th e fue l pressur e wit h th e
engin e idlin g an d th e vacuu m hos e o f th e fue l pres -
sur e regulato r disconnecte d fro m th e fue l pressur e
regulato r an d pinched . I f th e engin e wil l no t start ,
turn th e ignitio n switc h O N (II) , wai t fo r tw o sec -
onds , tur n i t off , the n bac k o n agai n an d rea d th e
fue l pressure .
Pressur e shoul d be :
29 4 - 34 3 kP a (3. 0 - 3. 5 kgf/cm
2, 4 3 - 5 0 psi )
4 . Reconnec t vacuu m hos e to th e fue l pressur e regula -
tor.
Pressur e shoul d be :
23 0 - 27 9 kP a (2.3 5 - 2.8 5 kgf/cm2,3 3 - 4 1 psi )
I f th e fue l pressur e is no t a s specified , firs t chec k th e fue l
pum p (se e pag e 11-130 ). I f th e fue l pum p i s OK , chec k
the following :
If th e fue l pressur e is highe r tha n specified , inspec t for :
— Pinche d o r clogge d fue l retur n hos e o r line .
— Fault y fue l pressur e regulato r (se e pag e 11-128 ).
I f th e fue l pressur e is lowe r tha n specified , inspec t for :
— Clogged fuel filter .
— Fault y fue l pressur e regulato r (se e pag e 11-128 ).
— Leakag e in th e fue l line .
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13. To prevent damage to the O-rings, install the fuel injectors in the fuel rail first, then install them in the intake mani-

fold.

'95 - 96 models only:

14. Align the center line on the connector with the mark on the fuel rail ('95 - 96 models only).

15. Install and tighten the retainer nuts.

16. Connect the fuel hose to the fuel rail with new washers.

17. Connect the No. 7 vacuum hose and fuel return hose to the fuel pressure regulator.

18. Install the connectors on the fuel injectors.

19. Install the engine harness cover.

20. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for approximately two seconds,

the fuel pressure in the fuel line rises. Repeat this two or three times, then check whether there is any fuel leakage.
FUEL

INJECTOR
MARKINGS
FUEL

RAILProCarManuals.com

PGM-FI Main Relay

Description

The PGM-FI main relay actually contains two individual

relays. This relay is located at the left side of the cowl.

One relay is energized whenever the ignition is on which

supplies the battery voltage to the ECM, power to the

fuel injectors, and power for the second relay. The second

relay is energized for two seconds when the ignition is

switched on, and when the engine is running, to supply

power to the fuel pump.

PGM-FI

MAIN RELAY

FUEL PUMP
Relay Testing

NOTE: If the car starts and continues to run, the PGM-FI

main relay is OK.

1. Remove the PGM-FI main relay.

2.

Attach the battery positive terminal to the No. 2 ter-

minal and the battery negative terminal to the No. 1

terminal of the PGM-FI main relay. Then check for

continuity between the No. 5 terminal and No. 4 ter-

minal of the PGM-FI main relay.

If there is continuity, go on to step 3.

If there is no continuity, replace the PGM-FI main

relay and retest.

3. Attach the battery positive terminal to the No. 5 ter-

minal and the battery negative terminal to the No. 3

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 7 terminal and

No. 6 terminal of the PGM-FI main relay.

If there is continuity, go on to step 4.

If there is no continuity, replace the PGM-FI main

relay and retest.

4. Attach the battery positive terminal to the No. 6 ter-

minal and the battery negative terminal to the No. 1

terminal of the PGM-FI main relay. Then check that

there is continuity between the No. 5 terminal and

No. 4 terminal of the PGM-FI main relay.

If there is continuity, the PGM-FI main relay is OK.

If there is no continuity, replace the PGM-FI main

relay and retest.ProCarManuals.com

Fuel Suppl y Syste m
PGM-F I Mai n Rela y (cont'd )
Troubleshootin g
Engine wil l no t start .
Inspectio n o f PGM-F I mai n
rela y an d rela y harness .
Chec k fo r a n ope n i n th e wir e
(GN D line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PGM-F I mai n
rela y 7 P connector .
3 . Chec k fo r continuit y betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l No . 3 an d bod y
ground .
I s ther e continuity ?
Chec k fo r a n ope n o r shor t i n th e
wir e (BA T line) :
Measur e voltag e betwee n th e
PGM-F I mai n rela y 7 P connecto r
termina l No . 7 an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n o r shor t i n th e
wir e (IG 1 line) :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e th e voltag e betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l No . 5 an d bod y
ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n o r shor t i n th e
wir e (ST S line) :
1. Tur n th e ignitio n switc h to th eSTAR T (III ) position .NOTE: Transmissio n i n o rposition .2. Measur e th e voltag e betwee n
th e PGM-F I mai n rela y 7 P con -
necto r termina l No . 2 an d bod y
ground .
(T o pag e 11-133 ) PGM-F
I MAI N RELA Y 7 P CONNECTO R (C417 )
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e PGM-F I mai n rela y an d G101 .
Replac e th e EC U (ECM ) (1 5 A )
fus e i n th e under-hoo d fuse /
relay box .Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I
mai n rela y an d th e EC U (ECM )
(1 5 A ) fuse .
Replac e th e No . 2 FUE L PUM P
(1 5 A ) fus e in th e under-das h
fuse/rela y box .
Repai r ope n o r shor t i n th e
wir e betwee n th e PGM-F I mai n
rela y an d th e No . 2 FUE L
PUM P (1 5 A ) fuse .
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Intake Air System

System Description

The system supplies air for all engine needs. It consists of the intake air pipe, Air Cleaner (ACL), intake air duct. Throttle

Body (TB), Idle Air Control (IAC) Valve, fast idle thermo valve, and intake manifold.

A resonator in the intake air pipe provides additional silencing as air is drawn into the system.

IAB CONTROL

SOLENOID VALVE

IAB

CHECK

VALVE

IAB

CONTROL

DIAPHRAGM
From No. 4 ECU

(ECM) ('95 - 96 models: 15A,

'97-98 models: 20A)

FUSE

(in the under-dash

fuse/relay box)

From PGM-FI

MAIN RELAY

VARIOUS

SENSORS

IAB

VACUUM TANK

THROTTLE
BODY

INTAKE

AIR DUCT

ACL

INTAKE

MANIFOLD
IDLE

ADJUSTING

SCREW
FAST

IDLE

THERMO

VALVE

RESONATOR
INTAKE

AIR

PIPE
IAC VALVE

ENGINE

COOLANT
ENGINE

COOLANT

IAB

VALVE
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Throttle Cable

Inspection/Adjustment

1.

2.

3.
Start the engine. Hold the engine at 3,000 rpm with

no load (transmission in or position) until the

radiator fan comes on, then let it idle.

Check that the throttle cable operates smoothly with

no binding or sticking. Repair as necessary.

Check cable free play at the throttle linkage. Cable

deflection should be 10 - 12 mm (0.39 - 0.47 in.)

CABLE

BRACKET.
ADJUSTING

NUT

LOCKNUT

DEFLECTION

10-12
mm

(0.39
-
0.47 in.)

4. If deflection is not within specs, loosen the locknut,

turn the adjusting nut until the deflection is as spec-

ified, then retighten the locknut.

5. With the cable properly adjusted, check the throttle

valve to be sure it opens fully when you push the

accelerator pedal to the floor. Also check the throttle

valve to be sure it returns to the idle position whenev-

er you release the accelerator pedal.
Installation

1. Fully open the throttle valve, then install the throttle

cable in the throttle linkage and install the cable

housing in the cable bracket.

CABLE

BRACKET

THROTTLE

LINKAGE
ADJUSTING

NUT

LOCKNUT

INNER CABLE

2. Start the engine. Hold the engine at 3,000 rpm with

no load (transmission in or position) until the

radiator fan comes on, then let it idle.

3. Hold the cable sheath, removing all slack from the

cable.

4. Turn the adjusting nut until it is 3 mm (0.12 in.) away

from the cable bracket.

CABLE

BRACKET

ADJUSTING NUT

LOCKNUT

9.8 N-m

(1.0 kgf-m,

7.2 Ibf-ft)
3 mm

(0.12 in.)

5.
Tighten the locknut. The cable deflection should now

be 10 - 12 mm (0.39 - 0.47 in.). If not, see inspection/

adjustment.ProCarManuals.com

Intake Ai r Syste m
Throttl e Bod y
Descriptio n
The throttl e bod y i s a single-barre l side-draf t type . Th e
lowe r portio n o f th e throttl e valv e i s heate d b y engin e
coolan t fro m th e cylinde r head . Th e idl e adjustin g screw ,
whic h increases/decrease s bypas s air , an d th e Evaporativ e
Emissio n (EVAP ) Contro l Caniste r por t ar e locate d o n th e
to p o f th e throttl e bod y ('9 5 - '9 6 model s only) .
THROTTL E
POSITIO N
(TP)SENSO R IDL
E ADJUSTIN G
SCREW
THROTTL EVALVE
THROTTL ESTOPSCRE W(non-adjustable )
Inspection
1.
2 .
Disconnec t th e vacuu m hos e fro m th e to p of the
throttl e body ; connec t a vacuu m gaug e t o th e throt -
tle body. *
Start th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (transmissio n in o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle. *
VACUU MPUMP/GAUGE , 0-3 0 in.H gA973 X - 04 1 - XXXX X
3. Allo w th e engin e t o idle , an d chec k tha t th e gaug e
indicate s n o vacuum. *
I f ther e i s vacuum , chec k th e throttl e cabl e (se e
pag e 11-137 ).
4 . Chec k tha t vacuu m is indicate d o n th e gaug e whe n
the throttl e is opene d slightl y fro m idle. *
If th e gaug e indicate s n o vacuum , chec k th e throttl e
bod y port . I f th e throttl e bod y por t i s clogged , clea n i t
wit h carbureto r cleaner .
5 . Sto p th e engine , an d chec k tha t th e throttl e cabl e
operates smoothly withou t bindin g o r sticking .
If ther e ar e an y abnormalitie s chec k for :
• Excessiv e wea r o r pla y i n th e throttl e valv e shaft .
• Stick y o r bindin g throttl e leve r a t th e full y close d
position .
• Clearanc e betwee n throttl e sto p scre w an d throt -
tl e leve r a t th e full y close d position .
* : '95-9 6 model s onl y
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Intake Air Bypass (IAB) Control System

Description

Two air intake paths are provided in the intake manifold to allow the selection of the intake path most favorable for a

given engine speed. Satisfactory power performance is achieved by closing and opening the intake Air Bypass (IAB)

valves. High torque at low rpm is achieved when the IAB valves are closed, whereas high power at high rpm is achieved

when the IAB valves are opened.

IAB CONTROL

DIAPHRAGM

From No. 4 ECU (ECM)

('95-96 models: 15A,

'97 - 98 models: 20A) FUSE

(In the under-dash

fuse/relay box)

VARIOUS

SENSORS

IAB

CONTROL

SOLENOID

VALVE

IAB VACUUM TANK

IAB CONTROL SOLENOID VALVE OFF

ENGINE RPM IS ABOVE 4,800 rpmProCarManuals.com

Intake Ai r Syste m Emissio
n Contro l Syste m
Intake Ai r Bypas s (IAB ) Contro l
Syste m (cont'd )
Intake Ai r Bypas s (IAB ) Contro l Valv e Testin g
1. Chec k th e IA B contro l valv e shaf t fo r bindin g o r stick -
ing.
2. Chec k th e IA B contro l valv e fo r smoot h movement .
3. Chec k tha t o f th e IA B contro l valv e is i n clos e con -
tac t wit h th e stoppe r whe n th e vacuu m hos e i s dis -
connecte d fro m th e IA B contro l diaphragm .
IAB CONTRO L VALV ESTOPPE R
4.Chec k tha t o f th e IA B contro l valv e is in clos e con -
tac t wit h th e full-clos e scre w whe n yo u appl y 5 1 kP a
(38 0 mmHg , 1 5 inHg ) o f vacuu m to th e IA B contro l
diaphragm .
FULL-CLOS ESCREW(Do no t adjust. )
If an y faul t i s found , clea n th e linkag e an d shaft s wit h
carbureto r cleaner . I f th e proble m stil l exist s afte r clean -
ing , disassembl e th e intak e manifol d an d chec k th e IA B
valv e bod y assembl y (se e sectio n 9 ).
Syste m Descriptio n
The emissio n contro l syste m include s a War m U p Thre e
Wa y Catalyti c Converte r (W U TWC) , a Thre e Wa y Catalyti c
Converte r (TWC) , Exhaus t Ga s Recirculatio n (EGR ) system ,
Positiv e Crankcas e Ventilatio n (PCV ) syste m an d
Evaporativ e Emissio n (EVAP ) Contro l system . Th e emis -
sio n contro l syste m is designe d t o mee t federa l an d stat e
emissio n standards .
Tailpipe Emissio n
Inspectio n
Do no t smok e durin g thi s procedure . Kee p
an y ope n flam e awa y fro m you r wor k area .
1 . Star t th e engine . Hol d th e engin e a t 3,00 0 rp m wit h
no loa d (transmissio n i n o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
2 . Connec t a tachometer .
3 . Chec k an d adjus t th e idl e speed , i f necessar y (se e
pag e 11-117 ).
4 . War m u p an d calibrat e th e C O mete r accordin g to th e
mete r manufacturer' s instructions .
5 . Chec k idl e C O wit h th e headlights , heate r blower ,
rea r windo w defogger , coolin g fan , an d ai r condition -
er off .
NOTE : (Canada ) Pul l th e parkin g brak e leve r up .
Star t th e engine , the n chec k tha t th e headlight s ar e
off.
CO mete r shoul d indicat e 0.1 % maximum .
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