ECO mode HONDA INTEGRA 1994 4.G Workshop Manual

,,
SUPPLEMENTAL RESTRAINT SYSTEM (SRS}
The Integra SRS includes a driver's airbag, located in the steering wheel hub. ln addition, all mod€ls excepi tna
Rs model for canada have a front passenger's airbsg located in the dashboard above the glove box, InformaUon
necessary to safely service the SRS is included in this servica Manual. ltems marked with an sstorisk (r) on thr
contents page include, or are located near, SRS components. Servicing. disassembling or roplacing thea6 ltems
will require special precautions and tools, and should thoreiore be done by an authorhed Acura dealer.
' To avoid rondering ths sRS inoporativo, which could lard to porronll Injury or darth In thc cvant ot. r.yr.
trontal collision, all sRs sorvico work must be pcrformcd by !n ruthorizcd Acu.! daerrr,
' lmpTopor 3orvica proceduroa, including inco.roct r.movd r d Installation of tha SRS, could Lld to pc[onc Inlu-
ry caussd by unintsntional activation ot tho airbags.
' All sRs oloctrical wiring harnoa$! aro coverod with yallow In3ulatlon, Rcbtcd componcnts arc bcrtad In tha
stoering Golumn, front console, dsrhboa.d, and darhboard lowor plnol, lnd in thc d$hbolrd abovc tha gaov!
bor. Do not uas oloctdcal te$ oquipmont on thaaa citcuhs.
NoTE: The original radio has a coded thett protection circuit. Be sure to get the customer's code numb6r b€lore* disconnecting the battery.
- removing the No. 32 (7.S A) fuse Jrom the undsr-hood fuse/relay box.
- removing the radio.
After service, reconnect power to the radio and turn it on. When the word ,,CODE,, is displayed, enter the cus_
tomer's 5-digit code to restore radio oDerauon.

Chassis and Paint Codes
U.S.Model
Vehicle ldentification Number
Manutactulol, Make and
Typ€ of Vshicle
JH4: HONDA MOTOR CO., LTD.
ACURA Psssenger car
Line, Body and Engino Type
DB7: INTEGRA 4-door/B1 881
DB8: INTEGRA 4-door/81 8Cl
DC2: INTEGRA 3-door/B18C 1
DC4: INTEGRA 3-door/B1 8B j
Body Type and Trsnsmission Type
3: 2-door Hatchback S-speed Manual
4: 2-doot Hatchback 4-speed
Automatic
5; 4-door Sedan s-speed Manual
6: 4-door Sedan 4-speed Automatic
Vehicle Glado (Seriesl
4: RS
5: LS
8; GS-R
Check Digit
Model Yaal
R: 1994
Factory Code
S: Suzuka Factory in Japan
Serial Numb€l
Vehicle ld€ntification Number and
JH4DB754* RSOOOOO 1
I
Engine Number
8l8Br-r300@l-----T-----
Engine Typ6
81881: 1.8 f DOHC Sequentiat Muhi-pori
Fuel-injected engine
B l8Cl : 1.8 | DOHC VTEC Sequ€nrial
Multi-port Fu€l-iniected €ngin€
Se al Numbel
Paint Code
COLOR
BG.33P
Federal Motor Vehicle Safety Standard Certification
Transmission Numbsr
Y80- 1 000@ I
Transmission Type
Y80: Manual
MPTA: Automatic
Serial Numbel
Paint Code
Paint CodeColor
BG.33P
G-71P
NH-5O3P
NH-538
NH-575M
R-7 2P
R-81
RP.24P
YR.5O3M
Paradise Blue-g.€en PeErl
Lausanne Gr6en Pead
Grsnada Black Pea.l
Frost White
Thunder Grav Metallic
Torino Red Pearl
Milano Red
Stealth Gray Pearl
Rosewood Brown M€tallic
1-2
3DOOR4DOOR

Canada Model
Vehicle ldentification Numbel
Manutacturer, Makeand
Type of v€hicle
JH4: HONDA MOTOR CO., LTD.
ACURA Passenger car
Lino. Body and Engine TYPo
D87: INTEGRA 4-doot/Bl 881
DC2: INTEGRA 3-dootBl 8C1
DC4: INTEGRA 3-doori B18B1
Body Type and Transmission TYPo
3: 2-door Hatchback 5-speed Manual
4'. 2-door Hatchback 4-speed
Automatic
5: 4-door Sedan s-speed Manual
6: 4-door Sedan 4-speed Automatic
Vehicle Grade {Sedes}
3: RS without passenger SRS airbag
4: RS with passenget SRS aitbag
8: GS-R
Check Digit
Model Yeat
R: 1994
Factory Code
S: Suzuka Factory in Japan
Serial Numbel
JH4DB753. RS800001
Engine Number
81881-1 700001
Engin€ Type
81881: 1.8 I DOHC Sequential Multi-port
Fuel-injected engine
B18C1: 1.8 I DOHC VTEC Sequential
Multi-Dort Fuel-iniected engrne
Serial Number
Paint Code
COLOR
BG.33P
Vehicle ldentification Number and
Canadian Motor Vehicle Safety Standard Certification
Transmission Number
Y80-1000001
Transmission Type
Y80: Manual
MPTA: Automatic
Serial Numbel
Paint Code
Paint CodeColor
Paradise Blue-green Pearl
Lausanne Green Pearl
Granada Elack Pearl
Frost White
Thunder Gray Metallic
Torino Red Pearl
Milano Red
Stealth Gray Pearl
Rosewood Brown Metallic
BG.33P
G-71P
NH-5O3P
NH-538
NH-575M
R-72P
R-81
RP-24P
YR-503M
3DOOR4DOOR
1-3

PGM-FI System
System Description
ENGINE CONTROL MODULE (ECMIOUTPUTS
PGM-Fl System
The PGM-Fl system on this model is a sequential multipon fuel injection system,
Fuol Iniector Timing and Duration
The ECM contains memories tor the basic discharge durations at various engine speeds and manifold pressures. Thebasic discharge duration, after being read out from the memory, is turther modilied by signals sent from vanous sensofsto obtain the final discharge duration.
ldle Air Control
ldle Air Control Valve (lAC Vatve)
When the engine is cold, the A/C compressor is on, the transmission is in gear (A/T only) the brake pedal is depressed,the P/S load is high, or the alternalor is charging, the ECM controls current to the IAC Valve to maintain correct idle soeed.
lgnition Timing Controla The ECM contains mamories for basic ignition timing at various engine speeds and manifold pressures. lgnition timingis also adjusted for engine coolant temperature.a A Knock Control System is also used. when detonation is detected by the knock sensof. the ignition timing is retarded(B18Cl engine).
Other Control Functions
1. Starting Control
When the engine is started. the ECM provides a rich mixture by increasing fuel injector duration.2. Fuel Pump Control
a When the ignition switch is initially turned on, the ECM supplies ground to the PGM-Fl main relay that suppliescurrent to the fuel pump tor two seconds to pressurize the tuel system.a When the engine is running, the ECM supplies gfound to the PGM-Fl main relay that supplies current to the fuel pump.a When the engine is not running and the ignition is on, the ECM cuts ground to the PGM-FI main relav which cutscurrent to the fuel pump.
TDC/CKP/CYP Sensor
MAP Senso.
ECT Sensor
IAT Sensor
TP Sensor
HO2S
vss
BARO Sensor
ELD
Starter Signal
ALT FR Signal
Air Conditioning Signal
A/T Gear Position Signal
Battery Voltage {lcN. 1)
Brake Switch Signal
PSP Switch Signal
Knock Sensor'
VTEC Pressure Switchr
Fuel-lnjectors
PGM-FI Main Relay (Fuel Pump)
MIL
IAC Valve
A/C Compressor Clutch Relay
Radiator Fan Relav
Condenser Fan Relav
ALT
rcM
EVAP Purge Control Solenoid
HO2S Heater
VTEC Solenoid Valve'
IAB Control Solenoid Valve*
lFuet tnjector Timing and Duration]
I Electr..l"ldle Contr;il
Fit'e' contr; Funcrfit
l6tio; Ttntrlg c..trol
tEcM aack-,rp Functiorlsl
': 818C 1 €ngine
11-40

3. Fuel Cut-oft Control
a During deceleration with the throttle valve closed, current to the {uel injectors is cut otJ to improve fuel economy
at speeds over tollowing rpm:
. 8188l engine: 91O tpm (Canada model: 1,O50 rpm)
. 818C1 engine: 95O tpm (Canada model: l,O5O rpm)
a Fuel cut-olf action also takes place when engine speed exceeds, 7,O0O rpm {81 8B1 engine), 8,1O0 rpm (B 18Cl
engine), regardless oI the position of the throttle valve, to protect the engine from ovet-revving.
A/C Compressor Clutch Relay
When the ECM receives a domand for cooling trom the air conditioning system, it del8ys the compressor from being
enetgized, and enriches the mixture to assure smooth transition to the A/C mode.
Evaporative Emission (EVAP) Purge Control Solenoid Valve
When the engine coolant tempersture is below 163oF {73"C), the ECM supplies a ground to the EVAP pu.ge control
solenoid valve which cuts vacuum to the EVAP purge control diaphragm valve.
Intake Air Bypsss (lAB) Control Sol€noid Valve
When the engine rpm is below 5,750 rpm, the IAB control solenoid valve is activated by a signal from the ECM,
intske air flows through the long intake path, then high torque is delivered. At spaeds highe. than 5,750 rpm, the
solenoid valve is deactivated by the ECM, and intake air flows through the short intake path in order to reduce the
resistance in airflow.
ECM fail-safe/bEck-up Functions
1. Fail-sate Function
When an abnormality occurs in a signal from a sensor, the ECM ignores that signal and assumes a pre-progtammed
value tor that sensor that allows the engine to continue to run.
Back-uD Function
When an abnormalitv occurs in the ECM itself, the fuel iniectors are controlled by a back-up citcuit independent of
the system in order to permit minimal driving.
Self-diagnosis Function IMaltunction Indicator Lamp {MlL)1
Wh6n an abnormality occurs in a signal from a sensor, the ECM supplies ground for the MIL and stores the code
in erasable memory. When the ignition is initially turned on, the ECM supplies ground tor the MIL tor two seconds
to check the MIL bulb condition.
Two Trio Detection Method
To prevent tals€ indications, th€ Two Trip Dstection Method is used for the HO2S and fuel metering-related self-
diagnostic tunctions. When an abnormslity occurs, the ECM stores it in its memo.y. Wh€n the ssme sbnormality
recurs alter the ignition switch is turned OFF and ON ag8in, the ECM informs the driver by lighting the MlL.
However, to ease troubleshooting, this function is canc€ll€d when you short the service check connector. The MIL
will then blink immedistelv when an abnormality occurs.
4.
6.
2
4.
11-41

The fusl supply system consists ot a fuel tank, in-tank
high presssure fu6l pump, PGM-FI main relay, fuel filter,
tuel pressure regulatot, fuel inioctors, fusl pulsation
damper and fuol delivery and return linss. This system
delivers pressure-regulatored fu6l to the fu6l injectors and
cuts the fuel delivory wh6n the engine is not running.
Fuel Supply System
System DescriptionFuel Pressure
a Do not smok6 while working on the fuol syst6m,
Keep open flames or spalks away tlom your work
aroa.
a 8e sure to raliavo fuol p.essur6 while th6 6n9in6 is off.
NOTE: Eefore disconnecting fuel pipes or hoses, release
pressure from the system by loosening the 6 mm se.-
vice bolt on top of the fuel filter.
1 . Disconnect the battery negative cable from the bat-
tery negative terminal.
NOTE: The LS and GS-R model radio may have a
coded theft protection circuit. Be sure to get the cus-
tomer's code number betore disconnecting the
batterv,
After service, reconnect Dowe. to the radio and turn
it on. When the word "CODE" is displayed. enter
the customer's s-digit code to restore radio
ooeration.
2. Remove the fuel fill cap.
3. Use a box end wrench on the 6 mm service bolt at
the fuel tilter, while holding the special banjo bolt
with another wrench.
4. Place a rag or shop towel over the 6 mm service bolt.
5. Slowly loosen the 6 mm service bolt one complete
turn.
NOTE:
a A fuel pressu.e gauge can be attached at the 6
mm seryice bolt hole.
a Alwavs replace the washer between the service
bolt and the special banio bolt. whenever the ser-
vice bolt is loosened.
a Replace all washers whenever the bolts are
removeo.
SERVICE BOLT15 N.m(1.5 kgf.m,11 rbr.ftl
FUEL FILTER
1 1-100

Filter
Fuel Supply System
Fuel
a Do not smoko while wo*ing on tusl system.
Keop open tlame away ftom your wotk area.a While replaclng th6 tusl liher, be caletul to koop a safodistanc6 betweon battery torminals and any tool3.
The Juel filter should b€ replaced every 4 years or 60,0O0miles (96,OOO km), whichever comes f irst. or wheneverthe fuel pressure drops below the specilied value
127 5 - 324 kPa, 2.8 - 3. 3 kgJ/cmr, 40-47 psi (Bl 8C 1engine: 329-378 kPa, 3.35-3.85 kgf/cmr, 48-55psi) with the fuel pressure regulator vacuum hose dis-
connectedl afte. making sure that the tuel pump and thefuel pressure regulator are OK.
1 , Disconnect the battery negative cable trom the bat-
tery negative terminal.
NOTE; The LS and GS-R model radio may have acoded theft protection circuit, Be sure to get the cus-
tomer's code number before disconnecting the
batterv.
After service, reconnect power to the tadio and turn
it on. When the word "CODE" is displaved, enter
the customer's 5-digit code to restore radio
operation.
2. Place a shop towel under and around the fueltilter.
3. Relieve fuel pressure (see page 11-100).
4. Remove the special banio bolt and the fuel feed pipe
from the fuel tilter.
Remove the fuel filter clamp and tuel Jilter.
When assembling, use new washers, as shown,
NOTE: Clean the llared joint ot high pressure hoses
thoroughly before reconnecting them,
1 1-108
SPECIALBOLT33 N.m(3.4 kgt.h,25 rbf.ft)
SERVICE BOLT15 N.m ll.5 kgt.m,1 I rbr.ftl
WASHERReplace
1O ttl.m(1.O kgf.m,7 tbt.ftl

. Ascending Contlol
When the TCM determines that the vehicle is climbing a hill in @ position, the system extends the engagement area
of 3rd gear to prevent the transmission Irom frequenrly shitting between 3rd and 4th gears, so the vehicle can run smooth
and have more power when needed.
NOTE: Shift schedules between 3rd and 4th gear are stored in the TCM to enable the transmission to automatically
select the most suitable gear according to the magnitude of a gradient by Fuzzy logic.
. Descending Control
When the TCM determines that the vehicle is going down a hill in @ position. the shift-up speed from 3rd to 4th gear
when the throttle is closed becomes taster than the set speed for tlat road driving to widen the 3rd gear driving area.
This, in combination with engine brake from the deceleration lock-up, achieves smooth driving when the vehicle is
descending.
There are two ascending modes with different 3rd gear driving areas according to the magnitude of a gradient stored in
the TCM.
When the vehicle is in 4th gear, and you are decelerating on a gradual hill, or when you are applying the brakes on a
steep hill, the transmission will downshitt to 3rd gear. When you accelerate the transmission will then return to 4th gear.
F
0
. Deceleration Control
Vohicle SDood
When the vehicle goes around a corner, and needs to decelerate first and then accelerate, the TCM sets the data for
deceleration control to reduce the number of times the transmission shifts to obtain smooth driving. When the vehicle
is decelerating from speeds above 27 mph (43 km/h). the TCM shifts the transmission from 4th to 3rd earlier than normal
to cope with upcoming acceleration to maintain smooth driving.
NOTE:
Fuzzy Logic: Fuzzy logic is a from at artificial intelligence that lets computers respond to changing conditions much like
a human mind would.
14-21

Troubleshooting Procedures
when the TcM senses an abnormality in the input or output systems. the E]indicator light in the gaugo assembly willblink.
when the service check Connector {located under the dash on the passenger side} is connected with the specaat toolas shown, the E] indicator light will blink the Diagnostic Trouble iode {DTCI when the ignition switch is turned on.
When the lDil indicator light has been reported on, connect the service check connector with the special tool.Then turn on the ignition switch and observe the @ indicator light.
GAUGE ASSEMSLY
)'t
DAI'A LI]TKcor{r{EcToR (3P)NOTE:Do not atlachjumpe. wire.
Sc. DTCI
So. DTC2
S.. DTC14
scs sHoRT CO[{]{ECTORoTPAZ-OOl0too
codes 1 through I are indicated by individual short blinks, codes 1o through 1 5 are indicated by a series of tong andshon blinks. one long blink equals l0 short blinks. Add the long and short blinks together to dete;mins the cod€. Aft6rdetermining the code, refer to the erectricar system symptom-to-component chart on pages 14-5o and 51.
ahon
f"l
some PGM-FI problems will also make the @ indicator light come on. After repairing the pGM-Fr system, disconnectthe BACK UP tuse (7.5 Al in the under-hood fuse/relay box tor more than 1o seconds to reset the TcM memorv.
NOTE:
a PGM-FI svstem
The PGM-FI system on this model is a sequential multipon fuel iniection svstem.' Disconnecting the BACK UP tuse also cancels the radio anti-theft code, preset stations and the clock setting. G6tthe customer's code numbe. and make note of the radio presets befote temoving the fuse so you can reset them.
14-48

Number of @indicator light
blinks while
Service Check
Connector is
connected with
the special tool.
@ indicator
lightPossible CauseSymptomRefer to
page
'loBlinksDisconnected engine coolant tempera-
rure (ECT) sensor connector
Short or open in ECT sensor wire
Faulty ECT sensor
Lock-up clutch does not
engage.14-68
1lOFFDisconnected ignition coil connector
Short or open in ignition coil wire
Faulty ignition coil
. Lock-up clutch does not
engage.'t 4-7 0
13Blinks. Shon or open in LT GRN wire between
the D3 terminal and ECM. Faulty barometric pressure {BARO)
sensor
NOTE: The BARO sensor is built into
the ECM
. No specific symptom
appears.
14-7 1
14Blinks. Short of open in FAS {YEL} wire be-
tween the D16 terminal and ECM. Faulty ECM
. Transmission jerks hard
when shitting.
't5OFFDisconnected mainshaft speed sensor
connecror
Short or open in mainshaft speed sen-
sor wire
Faulty mainshaft speed sensor
. Transmission jerks hard
when shifting.
14-75
SymptomProbable CauseRet.page
LQ! indicator light is on steady, not blinking whenever the ignition is on.14-77
[Q3] indicator light does not come on for 2 seconds after ignition is first
turned on.14-78
Lock-up clutch does not have duty operation (ON-OFFI.Check A/C signal with
A/C on.14-80Lock-up clutch does not engage.
Shitt leve. cannot be moved lrom @ position with the brake pedal
depressed.Check brake switch signal,14-41
It the self-diagnosis LQ4 indicator light does not blink, perform an inspection according to the table below.
a lf a customer describes the symptoms for codes 3, (yet the LQ! indicator light is not blinkingl, 6, 1 1 or 15, it will
be necessa.y to recreate the symptom by test driving. and then checking the @ indicator light with the ignition still
oN.
e lt ttre @ indicator light displays codes olher than those listed above or stays lit continuously, the TCM is faulty.. Sometimes the Lqd indicator light and the Malfunction Indicator Lamp (MlL)/Check Engine light may come on simul-taneously. lf so, check the PGM-Fl system according to the numbe. of blinks on the MIL/Check Engine light. thenreset the memory by removing the BACK UP fuse in the unde.-hood fuse/relay box for more than 1O seconds. Drive
the vehicle for several minutes at speed over 30 mph (5O km/h), then recheck the MIL/Check Engine light.
NOTE:
. PGM-FI system
The PGM-Fl system on this model is a sequential multiport fuel injection system.a Disconnecting the BACK UP luse also cancels the radio anti-theft code. preset stations and the clock setting. Get
the fuse so vou can reset them.the customer's code number and make note ot the radio
14-51