1995 ACURA TL engine coolant

Idle Control System

System Description

The idle speed of the engine is controlled by the Idle Air Control (IAC) Valve.

The valve changes the amount of air bypassing into the intake manifold in response to electric current controlled by the

PCM. When the IAC Valve is activated, the valve opens to maintain the proper idle speed.

ENGINE

COOLANT

IAC VALVE

INTAKE

MANIFOLD
PCM
From

PGM-FI

MAIN

RELAY

FAST

IDLE

THERMO

VALVE
IDLE

ADJUSTING

SCREW
VARIOUS

SENSORS

ENGINE

COOLANTProCarManuals.com

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 LOW

CONTROL

SOLENOID

VALVE
IAB HIGH

CONTROL SOLENOID VALVE

IAB LOW

CONTROL

DIAPHRAGM

VALVE
From PGM-FI

MAIN RELAY

From No. 4 ECU

(PCM)
(15 A)

FUSE

(in the under-dash

fuse/relay box)

VARIOUS

SENSORS

INTAKE

AIR

DUCT

FAST

IDLE

THERMO

VALVE
IDLE

ADJUSTING

SCREW
ENGINE

COOLANT
INTAKE

MANIFOLD
PCM
IAB

VACUUM

TANK
IAB

CHECK

VALVE

IAB HIGH

CONTROL

DIAPHRAGM

VALVEProCarManuals.com

Evaporative Emission (EVAP) Controls

Description

The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The

system consists of the following components:

A. Evaporative Emission (EVAP) Control Canister

An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from the

EVAP control canister into the engine and burned.

B. Vapor Purge Control System

EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a port

on the throttle body. The purging vacuum is controlled by the EVAP purge control solenoid valve.

'96 model:
'97 - 98 models:

C. Fuel Tank Vapor Control System

When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and

regulates the flow of fuel vapor to the EVAP control canister.

'96 model:

INTAKE MANIFOLD
THROTTLE

BODY

EVAP PURGE

CONTROL

SOLENOID VALVE

FUEL TANK

EVAP VALVE
EVAP TWO WAY VALVE
From

No. 4 ECU
(PCM) (15A)

FUSE (in the under-dash

fuse/relay box)

EVAP

CONTROL

CANISTER FRESH

AIR
EVAP PURGE

FLOW SWITCH

FUEL FILL CAP
PCM
VARIOUS

SENSORS

FUEL TANK
ENGINE COOLANT TEMPERATURE ABOVE 158°F (70°C)
ENGINE COOLANT TEMPERATURE ABOVE 99°F (37°C)
EVAP PURGE CONTROL SOLENOID VALVE DUTY CON-

TROLLED AFTER STARTING ENGINE
EVAP PURGE CONTROL SOLENOID VALVE OFF AFTER

STARTING ENGINEProCarManuals.com

Grade Logic Control System

How it works:

The PCM compares actual driving conditions with driving conditions memorized in the PCM, based on the input from the

vehicle speed sensor, throttle position sensor, engine coolant temperature sensor, barometric pressure sensor, brake

switch signal and shift lever position signal, to control shifting while a vehicle is ascending or descending a slope, or

reducing speed.

(cont'd)ProCarManuals.com

44. Disconnect the vacuum hoses, then remove the front

engine mounts.

VACUUM

HOSE
FRONT

ENGINE

MOUNT

45. Slowly raise the hoist up a little.

46. Remove the mid mounts.

MID MOUNT SPACER

MID MOUNTS
47. Remove the transmission housing mounting bolts

and the torque converter cover, then separate the

engine and the transmission.

Attach the transmission jack with a rubber pad or a

wooden block to protect the transmission housing.

Remove this bolt

after separating

the transmission

from the engine.
TRANSMISSION

HOUSING

MOUNTING

BOLT

DOWEL PIN

TORQUE CONVERTER

COVER

TRANSMISSION HOUSING

MOUNTING BOLT

48. Reinstall the mid mounts to the transmission and

retorque the mounting bolts.

49. Raise the chain hoist to remove all slack from the

chain.

50. Check that the engine is completely free of vacuum

hoses, fuel and coolant hoses and electrical wiring.

51. Slowly raise the engine approximately 150 mm (6 in).

Check once again that all hoses and wires are discon-

nected from the engine.

52. Raise the engine all the way up, and remove it from

the vehicle.ProCarManuals.com

Cylinder Head

Removal (cont'd)

17. Remove the spark plug wires, distributor and ground

cables from the cylinder head.

O-RING

Replace.
8 x
1.25
mm

18 N-m (1.8 kgf-m,

13 Ibf-ft)

DISTRIBUTOR

GROUND

CABLES

18. Remove the wire harness covers and positive crank-

case ventilation (PCV) hose.

6 x 1.0 mm

9.8 N-m (1.0 kgf-m,

7.2 Ibf-ft)

PCV HOSE

WIRE HARNESS

COVERS

6 x 1.0 mm

12 N-m (1.2 kgf-m, 8.7 Ibf-ft)
19. Remove the engine wire harness connectors and

wire harness clamps from the cylinder head and the

intake manifold.

• Five injector connectors

• TDC/CKP/CYP sensor connector

• CKF sensor connector

• Idle air control (IAC) valve connector

• Engine coolant temperature (ECT) sensor connec-

tor

• ECT gauge sending unit connector

• ECT switch connector

• Exhaust gas recirculation (EGR) valve lift sensor

connector

• Throttle position sensor connector

• Intake air bypass (IAB) control solenoid valve con-

nector

• Evaporative emission (EVAP) purge control sole-

noid valve connector

20. Remove the ground cable and water bypass hose.

GROUND

CABLE

6 x 1.0 mm

12 N-m (1.2 kgf-m, 8.7 Ibf-ft)

WATER BYPASS

HOSEProCarManuals.com

Radiator
Illustrate d Inde x
Syste m is unde r hig h pressur e whe n th e
engin e i s hot . T o avoi d dange r o f releasin g scaldin g
coolant , remov e ca p onl y whe n th e engin e i s cool .
Total Coolin g Syste m Capacit y (Includin g heate r an d
reservoir )
7.0 (7. 4 US qt , 6. 2 Im p qt )
Reservoi r capacity : 0. 7 (0. 7 U S qt , 0. 6 Im p qt )
RADIATO REngine coolan t
Refillin g an d bleeding , pag e 10- 5
Lea k test , pag e 10- 6
Inspec t soldere d joint s an d
seam s fo r leaks .
Blo w ou t dir t fro m betwee n
cor e fin s wit h compresse d air .
I f insects , etc. , ar e cloggin g
radiator , was h the m of f wit h
low-pressur e water .
CAUTION : Whe n pourin g engin e coolant , b e sur e t o
shu t th e rela y bo x li d an d no t t o spil l coolan t o n th e elec -
trica l part s o r th e painte d portion . I f an y coolan t spills ,
rins e i t of f immediately .
NOTE:
• Chec k al l coolin g syste m hose s fo r damage , leak s o r
deterioratio n an d replac e i f necessary .
• Chec k al l hos e clamp s an d retighte n i f necessary .
• Us e ne w O-ring s whe n reassembling .
RADIATOR CA PPressur e testing , pag e 10- 6
SELF-LOCKIN G NU TA: 4. 4 N- m (0.4 5 kgf-m ,3.3 Ibf-ft )B: 5. 4 N- m (0.5 5 kgf-m ,4.0 Ibf-ft )Replace .
6 x 1. 0 m m7 N- m (0. 7 kgf-m ,5 Ibf-ft )
COOLAN TRESERVOI R
FAN MOTO R
RADIATO R FA NSHROU D
AUTOMATI C TRANSMISSIO N
FLUI D (ATF ) COOLE R HOSE S
Refe r t o sectio n 1 4 whe n
installing .
CONDENSO RFAN SHROU D
LOWER RADIATO RHOSE
ENGIN E COOLAN TTEMPERATUR ESWITCH A
2 4 N- m (2. 4 kgf-m , 1 7 Ibf-ft )
O-RIN GReplace .6 x 1. 0 m m9.8 N- m (1. 0 kgf-m ,7.2 Ibf-ft )
A: SHOW A ALUMINU M manufacture d radiator .
B : DENS O manufacture d radiator .
O-RINGReplace .DRAINPLUG
UPPE RRADIATO RHOSE
RADIATO RFAN
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Engine Coolan t Refillin g an d Bleedin g
CAUTION : Whe n pourin g engin e coolant , b e sur e t o
shu t th e rela y bo x li d an d no t t o le t coolan t spil l o n th e
electrica l part s o r th e paint . I f an y coolan t spills , rins e it
of f immediately .
NOTE:
• Perfor m thi s procedur e whe n th e engin e i s cool .
• Befor e replacin g th e coolant , tur n th e ignitio n O N (II) ,
slowl y tur n th e climat e contro l temperatur e kno b t o
90 ° an d tur n of f th e ignition . Thi s wil l allo w th e
coolan t i n th e heate r t o drai n ou t wit h th e res t o f th e
system .
1.Whe n th e radiato r i s cool , remov e th e radiato r cap .
Loose n th e drai n plug , an d drai n th e coolant .
Remov e th e drai n bol t fro m th e righ t sid e o f th e
cylinde r bloc k t o drai n th e block .
DRAIN PLU G
DRAI N BOL T59 N- m (6. 0 kgf-m ,
4 3 Ibf-ft )WASHE RReplace.
3. Appl y liqui d gaske t t o th e drai n bol t threads , the n
reinstal l th e bol t wit h a ne w washe r an d tighte n i t
securely .
4. Tighte n th e radiato r drai n plu g securely .
5 . Remove , drai n an d reinstal l th e reservoir . Fil l th e
tan k halfwa y t o th e MA X mar k wit h water , the n u p
t o th e MA X mar k wit h antifreeze .
6 . Mi x th e recommende d antifreez e wit h a n equa l
amoun t o f wate r i n a clea n container .
NOTE:
• Us e onl y genuin e Hond a antifreeze/coolant .
• Fo r bes t corrosio n protection , th e coolan t con -
centratio n mus t b e maintaine d year-roun d a t
50 % minimum . Coolan t concentration s les s tha n
50 % ma y no t provid e sufficien t protectio n
agains t corrosio n o r freezing .
• Coolan t concentration s greate r tha n 60 % wil l
impai r coolin g efficienc y an d ar e no t recom -
mended .
7.
8.
9 .
CAUTION :
• D o no t mi x differen t brand s o f antifreeze/coolants .
• D o no t us e additiona l rus t inhibitor s o r anti-rus t
products ; the y ma y no t b e compatibl e wit h th e
coolant.
Engin e Coolan t Refil l Capacit y [includin g reservoi r
(0.7 (0. 7 U S qt , 0. 6 Im p qt))] :
5.2 (5. 5 US qt , 4. 6 Im p qt )
Loose n th e ai r blee d bolt s i n th e thermosta t hous -
in g an d intak e manifold , the n fil l th e radiato r t o th e
botto m o f th e fille r nec k wit h th e coolan t mixture .
Tighte n th e blee d bolt s a s soo n a s coolan t start s t o
ru n ou t i n a stead y strea m withou t bubbles .
BLEED BOLT S9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
With th e radiato r ca p off , star t th e engin e an d le t i t
ru n unti l warme d u p (radiato r fa n come s o n a t leas t
twice) . Then , i f necessary , ad d mor e coolan t mi x t o
brin g th e leve l bac k u p t o th e botto m o f th e fille r
neck.
Put th e radiato r ca p o n tightly , the n ru n th e engin e
agai n an d chec k fo r leaks .
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