Idle HONDA INTEGRA 1994 4.G User Guide

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

G) FUEL PUI-SATION DAMPER
@ AIR CLEANER(D RESONATOR6 imrlre arR Bypass (tAB) coNTRoL DIAPHRAGM
VALVE(D) IITITP IIN BYPASS {IAB) COTROL SOLENOID VALVE
ds) INTIXT AIR EYPASS TIABI VACUUM TANK
rio'l rnrarg ltn BYPASS (lABl cHEcK vALvE
6 rsnee wav cATALYTtc coNvERTER lrwc)
6 posrnve cRAf{KcAsE vENTILATIoN {Pcv) vALVE
6 evlponlrtve EMtsstot{ tEvAPl coNTBoL cANlsrER
6 evlponltvE EMtssloN {EvAP} PURGE coNTRoL
SOLENOID VALVE6i EVAPORATIV€ EMISSION (EVAPI PURGE CONTROL
DIAPHRAGM VALVE
6o ivlpoalrtve Eutsstof{ IEVAPI rwo wAY vALvE
c) HEATED OXYGEN SENSOR lHO2Sl
€) MANIFOLD ABSOLUTE PRESSURE IMAPI SENSOB
O EI{GINE COOLANT TEMPERATURE {ECT} SENSOR
€) INTAKE AIR TEMPERATURE {IAT) SENSOR
@ KNOCK SENSOR tKSl
@ IDLE alR coNTRoL llAcl vALvE
O FAST IDLE THERMO VALVE
@ FUEL INJECTOR
@ FUEL FILTER
@ FUEL PRESSURE REGULATOR
O) FUEL PUMP (FPI
@) FUEL TANK
@ FUEL TANK EVAPORATIVE EMISSION IEVAPI VALVE
11-11

Troubleshooting
Troubleshooting Guide
NOTE: Across each row in the chart. the systems that could be sources of a symptom are ranked in the order they should
be inspected staning with O. Find the symptom in the left column, read across to the most likely source. then refer
to the page listed at the top of that column. lf inspection shows the system is OK, try the next mosr likely system O, etc,
* lf codes other then those listed above are indicated, count the number of blinks again. It the MIL is in fact blinking
^ these codes, replace the ECM.
qy, lf the MIL is on while the engine is running. connect the SCS shon connector to the service check connector. It no
code is displayed {MlL stays on steady), the back-up system is in operation.
Substitute a known-good ECM and recheck. lf the indication goes away, replace the original ECM.
USA:
MALFUNCTION
INDICATOR
LAMP {MIL)
CANADA: ----l CHECK-ltGl- ENGTNE- | - LTGHT
- { -1t-
* * *: 818C1 engine
1-32
SYMPTOM
PGM.FI
ENGINECONTROLMOOULE
HEATEOOXYGENSENSOR
MANIFOLOAESOLUTEPRESSURESENSOR
TOP DEAD CINTTR/CRANKSHAFTPOSTT|ON/CYLINDERPOSITION SENSOR
ENGINECOOLANTTEMPfRA.TURTSENSOR
THROTTTEPOStTtONSENSOR
INfAKE AIRTEMP€RA.TUREsar,rs0R
BARO.METRICPRESSURESENSOR
IGNITIONOUTPUTSIGNAL
vEHtct-ESPfEDSENSOR
11.4246, 47,5011-56l1-581l-6011-6211-641t-661r-68
MALFUNCTION INOICATORLAMP (MIU" TURNS ON1 lor:t:]:lrmr:- i;:i'-tK3t-16l-16l'-\-16l/-----\
-r:+r-
-{"Pr:-o_-16l-.z-\r6t/_-\
MALFUNCTION INOICATORLAMP (MIL)'' BLINKS:O. or-8.-D:o.:@.
o, O'l3l/__-\.E-o.:O: or tr]--i !l/ -i-\| 7 t-/__-\
--l-l-l r0 I/----\| 13 |z_---\
\.--r--l
I r5 t-/.---\-t 17 t-/-]-\
ENGINE WON'T STAffTo@@
DIFFICULT TO STARTENGIN€ WHEN COLO@@(9)o
IRREGULARIDLING
WHEN COTDFAST IDLEouT 0f sPtc@@
ROUGH IDLE@o
RPM TOOHIGH@@
RPM TOOLOW@
FREOUENTSTALLING
WHILE@@
AFTER@
POOnPERFOEM.ANCE
MISFIRE ORROUGHRUNNING@@@
FAITSEMISSIONTEST@@@
Loss 0FPOWER@@@

Troubleshooting
Self-diagnostic Procedures (cont'dl
':818C1 engine
a lf codes other than those listed above are indicated, verifv the code. lf the code indicated is not listed above, replace
rhe ECM.
a The MIL may come on, indicating a system problem when, in fact, there is a poor or intermittent electricalconnection.
First, check the electrical connections, clean or repair connections it necessary.
o The MIL and @ indicator light may light simultaneously when the Diagnostic Trouble Code (DTC) 6, 7 or 17. Check
the PGM-Fl system according to the PGM-Fl system troubleshooting, then recheck the l!! indicator light. ll it lights,
see page 14-5O, 51.
a The MIL does not come on when there is a malfunction in the A/T Fl signal or Electrical Load Detector (ELDI circuits.
However, it will indicate the codes when the Service Check Connector is shorted.
DIAGNOSTIC
TROUBLE
CODE (DTCISYSTEM INDICATEDPsge
oENGINE CONTROL MODULE IECM)11-42
,lHEATED OXYGEN SENSOR IHO25)1 1-46
aMANIFOLD ABSOLUTE PRESSURE {MAP SENSOR)11-52
4CRANKSHAFT POSITION (CKP SENSOR)1 1-56
oENGINE COOLANT TEMPERATURE (ECT SENSOR)11-58
THROTTLE POSITION (TP SENSOR}11-60
ITOP DEAD CENTER POSITION (TDC SENSORI1 1-56
9No. 1 CYLINDER POSITION (CYP SENSOR)1 1-56
10INTAKE AIR TEMPERATURE (IAT SENSOR)11-62
13BAROMETRIC PRESSURE (BARO SENSOR}1|-64
14IDLE AIR CONTROL (IAC VALVE}11-42
tcIGNITION OUTPUT SIGNAL11-66
toFUEL INJECTOR1't-102
17VEHICLE SPEED SENSOR {VSSI11-68
20ELECTRICAT LOAD DETECTOR (ELD)'t 1-70
21VARIABLE VALVE TIMING & VALVE LIFT ELECTRONIC CONTROL SOLENOID
VALVE {VTEC SOLENOID VALVE)'6-36
22VARIABLE VALVE TIMING & VALVE LIFT ELECTRONIC CONTROL PRESSURE
SWITCH (VTEC PRESSURE SWITCHI-6-38
23KNOCK SENSOR {KS}-11-7 4
30A/T FI SIGNAL A11-76
3'rA/T FI SIGNAL B1 1-76
4'lHEATED OXYGEN SENSOR (HO25} HEATER11-47
43FUEL SUPPLY SYSTEM1 1-50
11-36

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

PGM-FI System
Heated Oxygen Sensor lHO2Sl
ztRcot{lAELEiIE'{T
HEATER
- --.'!- - -__-
lrPl _l !l-
-fi-l: The Malfunction Indicator Lamp (MlL) indicates Diagnostic Troubls Code (DTC) 1: A problsm in
/? the Heated Oxygen Sonsor (HO2S| circuit.
The Heated Oxygen Sensor IHO2S) det€cts th6 oxygon contont in th6 exhaust gas and signals th6 ECM. In operation,
the ECM receiv€s th6 signals trom the sensor and vari€s the duration during which tu6l is iniocted. To stabilize thd sen-aor's output, tho sensor has 8n intarnal heater and the sensor olemant is coatod with a catslyst. The HO2S is installod
in TWC housing (B18Cl engine) or exhaust pipe B (Bl8Bl €ngine).
sEl{SORTERMII{ALS
:tz-t6l-/ --.- \
VOLTAGE (V}sTotcHtoltETncAIR-FUEL BANO
HEATEBTEBMIT{ALSRICH - AN. - LEAI{FUELRATIO- Th! mll h.. bo.n raportad on.- Wlth thr SCS rhon coon cto.connoctad lr.. p!9. 1t-341,cod. t l. Indlcltrd.
Oo th€ ECM Res€t Procodure {soopag€ 11-35).
Stan the 6ngine. Hold th6 engine
A3,qgq rpm with no load {A/T in
Lryl or lll position, M/T in nourralluntil the radiator lan com6s on.then lot it idle lor ot least on6minutg beforo road t€6tin0.
Connoct ths SCS short connoctorto th6 sorvic€ check connectorlsoo p.g6 1 1-34).
Rood t€st witlthe automatictransmission in L?l position (M/T:4th gear).Stsrting st l,600 rpm, acc6lorateu6ing wide open throttlo for atlesgt 5 seconds. Thsn dgcol€rstefor at lorst 5 s€conds with th€throttlo completoly closed.
Intarmittd[ t llurc, lyri.m b Of!l thla tlmc. Ch.ck lor poor con-nacdona o? loota wlrat |l C223(loc.trd at right $ock towo.l,Cr 13 (HO2S| lnd ECM.
Ooes the MIL blink and doos itindic6t6 cod6 1?
Go to plga and partonn tad fotcod. 43 lr.a p.go l1-501.
1 1-46

PGM-FI System
rj-t
--t-.
Fuel Supply System
-+-lt@t- -t 13 |- ' "- - --i--
T,-n The Maltunction Indicator Lamp (MlL) indicares Diagnostic Trouble Code (DTC) 43: A problem in
- L:!-i - the Heated Oxygen Sensor (HO2S) circuit. or a probtem in the Fuel Supply System.
NOTE:. Use DIGITAL MULTIMETER.. U6e 2 Volt rang6.
o oooooo oooooo I oo oooooooooooooooooooQoo ooo ooooo I oooo ooooooooooooooo
426
JUMPER WIRE
o ooooo oooo ooo I oo oooooo Isdtcllodsl ooo ooooooooo oooo ooo oo ooo I oooo ooooooooooooooo
D14 {+l
I
426 t-l vohrgo rhould rl.n.t
| 0.4-0.5 V wh.n th..- ignirioo .wilch i! firdt|rtrod o.r, Itd docr!6ato b.low O.1 V in L..th6n two minutaa.
- Tho MIL h.s boen reportod on.- With rhe SCS short con-noctor connocted (soo paga1l-34), codo 43 b indlcat.d,
From codr I troebl.-lhoorlng lprgo 1146).
ls the code 43 accompanied bythe MIL and poor driveability?Go to Fuol Supply .y.t.m (|ecpag6 1t-971.
Do the ECM Reset ftocedure lseepage 11-35).
Connect the SCS short connectorto the service check connector{see page 'l1-34).
Start the engine. Hold the engineat 3,00O rDm with no load {A/T in
@or@ position, M/T in neutral)until the radiator Ian comes on,then let it idle for at least onemanute,
Intonnitl.nt t llure, tydom lr OKat thi. tim. lto.t drlv. mly b.nocaararyr.Chock lor poo? connactlona otloots wiro at C223 lloc.t.d atrlghl lhock towo.]. Cl13lHO2Sland ECM,
Raise the engine speed to 3,000rpm and hold that throttle positiontor at least one minute.Do not vary the throttle positioneven if the rpm drops.
Ooes the MIL blink and does itindicate code 43?
Turn the ignition swilch OFF.
Connect the test harness betweenthe ECM and conneclors {seepage 1 1-371.
With the ignition switch OFF, waitfor at least two minutes.
lnstall a jumper wire on the testharness between A6 and A26.
11-50
1To page 1 1-5'l l

PGM-FI System
Engine Coolant Temperature (ECT) Sensor
- ,-!-- ---1- -
t@l- -l 6 | The Malfunction Indicator Lamp (MlL) indicates Diagnostic Trouble Code (DTC) 6: A problem in- - the Engine Coolant Temperature (ECT) Sensor circuit.The ECT Sensor is a temperature dependant resistor (thermistor). The resistance oI the thermistor decreases as th€ en-gine coolant tempe.ature increases as shown below.
J rsG-11
RESISTANCE{k0l
- \.--r-l--t 5 | /--i- \
j 32 68lOrr la0 t76 2t2 2a8 (.Fl-2tt 0 20 rto ao D r@ t20 (,cl
ENGII{E COOLAI{T TCMPERATURE- Th€ MIL has boon roDortod on.- Wlth tho SCS shon connoctorconnoctod {s66 pag6 '11-34},
code 6 is indicatod.
Do the ECM Reset Procedu.e lseepage 1 1-35).
Turn the ignition switch ON.
Intoimittont failur6. ryatom is OKel this lime ltosl d.ive may bonocassaryl.Chock for poor connsctiona orlooso wiros al C223 {locatod attight shock lowor, C111 (ECT
sonsorl, C419 {TCMI and ECM.
ls the MIL on and does it indi-cate code 6?
Start the engine. Hold the engineat 3,O0O rom with no load {Afi in
N or lF]position, M/T in neutral)until the radiator lan comes on,then lot it idle.
Turn the ignition swirch OFF.
Disconnect the 2P conneclor lromthe ECT sensor.
Measure resistance between the2 terminals on the ECT sensor.
ls there 2OO-4OO O?
(To page 1 1-59)
11-58
--

PGM-FI System
Electrical Load Detector (ELDI
tft;-]/ The Maltunction Indicaror Lamp (MlL) indicatss Diagnostic Trouble Code IDTC) 20: A probtem in-Li!- tne Electrical Load Detecror {ELD} circuit.
With lho SCS lhon connectolconnoctod {ree pago 11-34}, cod.20 is indicatod.
Do the ECM B6set Procedurs {seepage 1 'l-35).
Start engine and keep engin€speed at idle.Turn on headlights.
lntennlna tlllure, lyrtom lt Ol(!t irl. dm. (lgtt driv. mly [email protected] for Door connactlona oaloota wiro. rt C218 IELD, lndEctrt.
Ooes the MIL indicato code 20?
Romove the undgr-hood fusg/relay box and remove the tus6/relav box lowet cover.
Turn lhe ignition switch ON.
Measure voltage betw€on BLK/YEL (+l terminal and BLK (-)terminal.
Msasuro voltag€ b€tweon BLK/Y€L {+) terminal snd bodvground.ls there bartory voltagel
Rcpir oo.n in BLK wir.batwaan lha 3P connrc-tor lnd G2Ol {loc.t.dtroit ot angh|. comprn-m.r dghl .ld.l,
B.p.lr op.n in BLKrYEL wlrr b.-tw..n o.24ACG (ALn flcl115A: Bl88l .ngln!, 20 A:818C1cnginol fu!. In thr und.r{..htu.o/r.lly bor lnd tho 3P con-rcclo?.
View tromwire side
BLK (-)
(To page 11-7'l)
GRn/iED I - |
BLK/YEL I + I
11-70

PGM-FI System
Knock Sensor (KS) tB18C1 enginel
ml- nl: The Malfunction Indicator Lamp (MlL) indicates Diagnostic Troubte Code (DTC) 23: A probtem inthe Knock Sensor (KS) circuit.
a6l--fzt.i--1/.---r+\
ware sido
o ooooo ooo ooo o looooooooo oooo ooo oo ooo I oooo oooo
11-74
- The MIL h6s boon r6port6don.- With th6 SCS ahort connec-tor connoctod (soe pago11-341, codo 23 is in-dicrtod.
Oo the ECM Reset Proceduro (seepage 11-35).
Start the engine. Hold the engineg!-3,Opq rpm with no load {A/T in
Lryl orlPlposirion, M/T in neurra until the radiator fan comes on,then let it idle.
Hold the engine at 3,0O0-4,000rpm for 10 seconds.Intomittor failure, ay5-t.m is OK at this tim6(teat drivo mav bonec€saary,.Chock tor Door connec-tion3 or loo3o wlaos etC222 {locatod 6r ghrshock tow6r), Cl33(KSl and ECM.Turn the ignition swirch OFF.
Connect the test harness to themain wire harness only, not to theECM (see page 1 1-37).
Check for continuity between D3terminal and body ground.
Ropdr short in RED/BLUwiro b€tweon ECM {D3land ths Ks.
(To page 11-75)