engine ACURA INTEGRA 1994 Service Owners Manual

Radiator
Replacement
1.Drain the engine coolant.
Remove the upper and lower radiator hoses, and ATF
cooter noses.
Disconnect the fan motor connectors.
Remove the radiator upper brackets, then pull up the
radiator.
5. Remove the fan shroud assemblies and other parts
from radiato..
lnstall the radiator in the reverse order of removal:
NOTE:
a Set the upper and lower cushions securely.
a Fill the radiator and bleed the air.4.
UPPER BRACKETAND CUSHTOl{
RADIATOR CAP
t
e
6 x l.O mm9.8 N.m (1.O kgt.m,7.2 rbf.ft)
6 x 1.0 mm9.8 il.m 11.O kgt'm,7.2 lbr.ftl
FAN MOTOR
CUSHION
SHROUDO-RINGReplace.
6 x 1.0 mm9.8 N.m ('l.O kgl.m,7.2 tbl.ttl
DRAIN PLUG
LOWER RADIATORHOSE

@ ne-oving the radiator cap while the engine
is hot can cause the engine coolant to splay out, seri-
ously scalding you. Always let the engine and radiatol
cool down betore removing the radiator cap.
CAUTION: When poudng engine coolant, be sure to shut
the relay box lid and not to let coolant spill on the elec-
tlical pans or the paint. ll any coolant spills, rinse it otf
immediately.
1. Slide the heater temperature control lever to maxi-
mum heat.
Make sure the engine and radiator are cool to the
touch.
2. Remove the radiator cao.
3. Loosen the drain plug on the bottom of the radiator,
and remove the drain bolt from the enoine block. Let
the coolant drain out.
ENGINE DRAIN BOLT78 N.m {8,O kgt.m, 58 lbt.ftlApply liquid gasker tobolt thread when installing.WASHERReplace.
5.
Remove the reservoir from its holder by pulling it
straight up. Drain the coolant, then put the reservoir
back in its holder.
When the coolant stops draining, apply liquid gasket
to the drain bolt threads, then reinstallthe bolt with
a new washer. Tighten it securely
6. Tighten the radiator drain plug securely.
7. Mix the recommended antifreeze/coolant with an
equal amount of water in a clean container.
NOTE:
. Use only HONDA-RECOMMENOED antifreeze/
coolant.
a For best corrosion protection, the engine coolant
concentrations must be maintained year-round at
50% MINIMUM. Coolant concentrations less than
50% may not provide sufficient protection
against corrosion or freezing.
CAUTION:
a Do not mix ditterent blands ot anti-freeze/
coolants.
a Do not use additional rust inhibitois or anti-rust
products; they may not bs compatibl€ with the
recommgndsd engins coolant.
Engin€ Coolant Retill Capacity: including reservoir
{0.6 t (0.6 US qt, 0.5 lmp qt)).
81881 engine:
MlTt 4.4 | (4.6 US qt, 3.9 lmp qr)
Afft 4.7 [ (5.O US qt,4.1 lmp qt]
Bl8Cl engine:
Mnt 4.7 | (5.0 US qt.4.1 lmp qt)
8. Pour coolant into the radiator up to the base of the
filler neck.
9. Loosen the bleed bolt on top of the engine. Tighten
it again when coolant comes out in a steady stream
with no bubbles.
BLEED BOLT
1O. Refill the radiator to the base of the tiller neck. Put
the cap on the radiator. and tighten it only to the tirst
stop, Stan the engine and let it run until it warms
up (the radiator cooling fan comes on at leasttwice).
11. Turn oft the engine. Check the level in the radiator,
and add coolant it needed. Install the radiator caD,
and tighten it fully.
'1 2. Fill thereservoirto the MAX mark. lnstallthe reser-
voir cap.
9.8 N.m (1.O kgl.m, 7.2 lbf.ftl
Engine Coolant Refilling and Bleeding
10-5

Radiator
Cap Testing
1.Remove the radiator cap, wet its seal with engine
coolant, then install it on the pressure tester.
Apply a pressure ol:
93- 123 kPa(O.95- 1.25 kgJ/cm', 13.5- 1 7.8 psi)
Check for a drop in pressure.
2.
3.
PRESSURE TESTER
Pressure Testing
1.Wait until the engine is cool, then carefully remove
the radiator cap and fill the radiator with engine
coolant to the top of the filler neck.
Attach the pressure tester to the radiator and apply
a pressure of:
93- 1 23 kPa(O.95- 1.25 kgf/cm,. 13.5-17.8 psi)
Inspect for engine coolant leaks and a dfop in
pressure,
Remove the tester and reinstall the radiator cap.
NOTE:
a Check for engine oil in the engine coolant and/or
coolant in the engine oil.
a Check for ATF in the engine coolant and/or
coolant in the ATF (A/T).
10-6

Inspection
Remove the timing belt (81881 engine: see page
6-1O, B18C1 engine: see page 6-49).
Check that the water pump pulley turns counter-
clockwise,
Check for signs ol seal leakage.
NOTE: A small amount ot "weeping" from the
bleed holo is normal,
BLEED HOLE
2.
J.
J.
Replacement
6 r 1.O rnm12 N.m {1.2 kgf.m,4.7 bf.ftl
4. lnstall the water pump in the reverse order
removat.
NOTE:
a Keep the O-ring in position when installing.
a Clean the spilled engine coolant.
Remove the timing belt (818B1 engine: see page
6-10,818C1 engine: see page 6-49).
Remove the camshaft pulleys and the back cover(81881 engine: see page 6-19. B18C1 engine: see
page 6-581.
Remove the water pump by removing five bolts,
NOTE: Inspect, repair and clean the O-ring groove
and mating su.lace with the cylinder block.
DOWEL PIN
BI-EED HOI-E
10-9

Fuel and Emissions
Spocial Tools ................ 1 1-2
Compon€nt Location
lndex ................. ...... 11-3
System Description
Vacuum Connectiona .......,.................... 1 1 -8
Efectrical Connections ....,.,.,......,...,,.....,'11-12
Syst€m Connectors ...,...,.................-.--. 11-2O
T.oubloshooting
Troubleshooting Guido .......................... 1 1-32
Self -diagnostic Procedures .,..,............... 1 1 -34
How to Road Flowcharts ...................,... 11-39
PGM-Fl System
Systom Description .............................. 1 l-4O
Troubleshooting Flowcharts
Engine Control Moduls ............... ........... 1 1 -42
Heated Oxygon Sensor ......,.................. 1 1-46
Heated Oxyg€n Sonsol Heatel .....,......... 1 1 -47
Fuel Supply System ..............-............... 1 1-50
Manitold Absolute Pressure
Ssnsor ............................................ 1 1-52
Top D6ad Cente./Crankshatr
Position/Cylindor Position sonsor ........ 1 1 -56
Engine Coolant Tempsrature Sonsor ....... 11-58
Throttlo Position Sonsor ........,..,,........... 1 1-60
Intake Air Temperaturs Sensor ............... 11-62
Baromet c Prsssuro Sensor ......,...,...,..,. 11-64
lgnition Output Signal ........................... 1 1 -66
Vehicle Spe€d Sensor ........................... 1 1 -68
Electdcal Load Dotector ....,...,..........,.... 1 1 -7O
Knock Sensor [818C1 engine] ............... 11-74
A/T Fl Signal A/B ................................. 1 1-76
ldle Contlol System
System Troubleshooting Guide .................. 1 1 -78
Systom Description ........ 11-79
Troubloshooting Flowchans
ldl€ Ail Control Valve ........................... 1 1 -82
Ail Conditioning Signal ......................... 1 1 -84
Altemator FR Signal ............................. 1 1 -86
Automatic Transaxle (A/T) Gear
Position Signal ......... 11-88
Brake Switch Signal ............................. 1 1 -9O
Startel Switch Signal ............................ 11-92
Power Steering Pressure Switch Signal ... 11-93
Fast ldle Thermo Valve ...................,......... 1 1 -94
ldls Speed S€tting .................................... 1 1 -95
Fuel Supply System
Systam Tloubloshooting Guid. .................. 1 1 -97
Fuol Linos ...................... 1'l -98
System Description ........ 11-100
Fuol Prassure ................. 11-100
Fu6l Ini6ctors ................. 11-102
Fuel Pressure Ragulato. .,. 11-106
Fuel Filter ...................... 11-108
Fual Pump ..................... 11-109
PGM-Fl Main F6lay ................................... 1 1"1 1 1
Fuel Tank ...................... t 1-114
Intake Air System
System Troubloshooting Guido .................. 1 1 -1 1 5
Systom Dascription ........ 11-116
Air Clean€r .................... 11-117
Throttls Cable ................'11-118
Throttl8 Body ................ 11-120
lntake Air Bypass Cont.ol Systsm
[B18Cl enginal .,......... 11-123
Intake Manilold [B1881 onginol ................. 11-128
Emission Control System
Systsm Troubleshooting Guido .................. 1 1 -1 29
Systam Doscription ........ 11-130
Tailpips Emission ........... 11-130
Thrae Way Catalytic Convortor ...,...,........., 11-131
Positiva CrankcaEo V6ntilation Systcm .,....., 11-134
Evaporativo Emission Contro|,..,..,.,.,,.,,..,.., 1 1-135

Component Locations
lndex
81881 sngin6:
IOLE AIR CONTROL OACI VALVEpage '11-82T
MANIFOLD ABSOLUTEPRESSURE {MAP} SENSOREVAP
THROTTLE POSITIOIII {TP) SENSORTroubleshooting, page 1 1-60
Troubleshooting,
(ECTI SENSOR HEATEO
PURGE CONTROLSOLENOID VALVETroubleshooting,11-137
THROTTLE CABLEInspection/Adiustment, page 1 1-1 18
Installation, page 11- 1 18
SENSOR lHO2S}
TOP DEAD CENTER/CRATIIKSHAFTPOSITIOf{/CYLINDER POSITION(TDC/CKP/CYP} SENSORTroubleshooting, page 1 1-56
INTAKE AIR TEMP€RATURE IIAT) SEI{SORTroubl€shooting, page 1 1 -62
POWER STEERING PRESSURE (PSP)
swtTcHTroubleshooting. page 11-93
sq
IDLE THERMO VALVEInspection, page 11-94
ELECTRICALLOADOETECTORIELD}Troubleshooting.page,l l-70
IGNITIONMODULE {ICMI
Troubleshooting, page 1 1-66
ENGINE COOLANT TEMPERATroubleshooting, page I 1-58Troubleshooting. pages 11-46, 47
11-3

ENGINECOOLANT
@ FUEL TAI{K EVAPORATIVE EMISSION (EVAP} VALVE
G) FUEL PULSATION DAMPER
@ AIR CLEANER
@) RESONATOR
@ THREE WAY CATALYTIC CONVEnTER (TWC)
o POS|TIVE CRANKCASE VEITITILAT|ON IPCV) VALVE
@ EVAPOBATIVE EMISSION IEVAP) COI{TROL CANISIER
@ EvApoRATrvE EMrssroN IEVAP) PURGE coNTRoL
SOLENOID VALVE
@ EVAPORATTVE EMISSION (EVAP) PURGE CONTROL
DIAPHRAGM VALVE(iD EVAPORATIVE EMISSION (EVAPI TWO WAY VALVE
|l
U]
HEATED OXYGEI{ SEI{SOF (HO2S}
MANIFOI.D ABSOLUTE PRESSURE (MAP) SEI{SONENGINE COOLANT TEMPERATURE IECT} SENSORINTAKE AIR TEMPERATURE IIAT} SEI'ISORIDLE AIR CONTROL IIAC) VALVEFAST IDLE THERMO VALVEFUEL II{JECTORFUEL FILTERFUEL PRESSURE REGULATONFUEL PUMP IFP)FUEL TAI{K
11-9

System Description
Vacuum Connections
818C1 engine:
INTAKEAIRBYPASS IIAB}VACUUMTANK
INTAKE AIRSYPASS IIAB}CONTROL DIAPHRAGM VAI-VE
MANIFOLO ABSOLUTEPRESSURE {MAP) SENSOR
toEVAPORATIVEEMISStONIEVAPITWO WAYVALVE
EVAPORATIVE EMISSION{EVAP) PURGE CONTROLDIAPHRAGM VALVE
EVAPORATIVE EMISSIONIEVAPI CONTROL CANISTER
INTAKE AIRBYPASS IIABICONTROL SOLENOID VALVE
PURGE CONTROLSOLENOID VALVE
11-10

System Description
System Connectors IEngine Compartmentl
{818C1 onginol
ENGINEWIRE HARNESS
t3
c132
c131
UNDER,HOOOFUSE/RELAYaox
c102c222
ct 04c220
MAllrlWIREHARI{ESS
o
11-20

E:I
I if,l.)
l;TYra-"wrrr. Ile llel/nEo II€ TcRNrwHrtlI ,ITwHr^rJl I
c214
ffi
c1
r+lrl2l
trtr
32
o
c112
r'ft]
IOTBLF------lla lsLx/YEL Ifo lanlr l]l
c111
6
\:-/
lI-FErwHr - l1olGuNlert l-l
cl1
3t
tr
c1c117lB18C1 engine)
/ r\
\^y
IETYEL/€Lh---llohED' ----,,
c216
^Jl
FFIN
c221
ffi
ldlcRr/vEr ---l
NOTE: a Different wires with the same color have been given a number suffix
YEL/BLK1 and YEL/BLK, are not the same).
O: Related to Fuel and Emissions System.
a - Connector of male terminals: View from terminal side- Connector of temale terminals: View from wire side
c215
r'fr]
fi'Twtl-rirllrlerrrltlerl-lfr-Twrr - lll
I@ LWHTTREO I
to distinguish them (for example,
(cont'd)
11-21
cl10
ohN/BLK l|/BL!
ALU/YEL