Main harness HONDA INTEGRA 1994 4.G User Guide

{From pag6 l1-62}
Turn the ignition switch ON.
Messuro voltage b€tw€6n RED/YEL (+) terminal and bodyground.
M€asurs voltage between RED/YEL {+) rerminal and GRN/BLU{ - I terminal,ls thore approx. 5 V ?
Rsp.lr op.n in GBt{/8LU wir bctwo.r ECM
lD22l snd tho IATaanaor.
Turn the ignition switch OFF.ls thero a99rox. 5 V ?
Sub.lhul. a tnown{ood ECMlnd rachack. It rymptom/lndlc!-don gort arv.y, t pl.c. dr! oilgl-n.l ECM.
Rap.lr opon or rhon In REDfYELwh. b.tw..n ECM lDl5l rnd th.lAf tcrrao.-ls th€re spprox. 5 V ?
Connsct lhg t€st hamess "D"
connoctor to the ECM only. not toth6 main wire harness lsse page
11-371.
Turn tho ignition switch ON.
Mgasur€ voltag€ bstwgon D15(+) terminal and D22 l-ltgrminal.
S0brlitrrt. . lnown{ood ECM'|d '.<hoc-l, tl p.slcribad voltlecta now lvarlblc, rlplaca tha origi-nal ECM.
1 1-63

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)

PGM-FI System
A/T Fl Signal A/B (A/T only)
\[l0l- The Maltunction Indicaror Lamp (MlL) indicates Diagnostic Trouble Code (DTC) 30: A problem In-L= the A/T Fl Signat A circuit between Transmission Control Module (TCMI and ECM.
tItil- The Malfuncrion Indicaror Lamp {MlL) indicates Diagnostic Trouble Code {DTCI 31: A problem In-Li!- the A/T Fl Signal B circuit between Transmission Controt Module (TCM) and ECM.
\.__r_/ \.__r_/-l 30 l- o'-l 3t l------ /----\
84'
+ulty? Continuity?
r: code 31 1A/T Fl signal Bl
11-76
Wlth tho SCS ahon connocrolconi|ocd {!o. p.g. 'l 1 -341, codo3O and/or 31 ars indicltod.
Oo ths ECM Resot Proceduro {seepag€ 'l 1-35).
Test drive necessary.Drive the car lor several miles sothat the transmission uDshifts anddownshilts several times.
Intormittant tsilu.o, sy3tem iB OKat thir tima,Chack lor poor connactions otl.ro!€ wiror at C419 (TCM] andECM.
Does the MIL indicare code30 and/or 31?
Turn the ignition switch OFF.
Connect the test harness to th€main harness only, not to the ECM(see p8go l'l-37).
Disconnect the 22P connectorfrom the TCM.
Check lor continuity between B3andlor 84' terminal and bodygrouno.
Ropair lhon in GRN/8LU or GRY'wiro b6twoon ECM (83 or 84'land tho TCM.
(To page 11-77)

ldle Gontrol System
Air Conditioning Signal
This signals the ECM when there is a demand for cooling from the air conditioning system.
Connect the t€st harness betweenthe ECM and connectors. Discon-nect "B" connector from the mainwire harness onlv, not the ECM{see page 11-37}.
Turn the ignition switch ON.
Measure voltage between 851+ )lerminal and A26 l- I terrninal.
Sub.litut ! known{ood €CMrnd r6<tEck. ll p.lrcib.d vottrgoi! now avalhbla, iaplaco tho o,ig-in.l ECM.
ls there approx. 5 V?
Turn th€ ignition switch OFF.
Reconnect "8" connector to themain wire harness.
Turn the ignilion switch ON.
Momentarilv connect A15 termi-nalto A26 terminsl severaltimes.
Momsntarilv connect the 8LK/RED t€rminal of the 4P connectoron the A/C clutch rel6v to bodyground sevsral times.
ls there a clicking noise fromthe A/C comDressor clutch?
3o6 rlr condhlohar in-rDactlon llaa lac{ion221.
ls there a clicking nois€ lromth€ A/C comoressor clutch?
Rop.ir opon in BLK/BED wiro be-two.n ECM {A15} and A/C clurchrally.
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.pprox. 5 V?
426 (- )
Cllcklng?
lTo page
11-84
-

ldle Control System
Alternator (ALTI FR Signal
This signals the ECM when the Alternator (ALT) as charging.
D9 l+)
Inspection ot ALT FR Sign.l.
Connect the tost harness betweenthe ECM and connectors. Discon-nect "D" connector from themain wire harnoss only, not theECM lsee page 11-37).
Turn the ignition switch ON.
Measure voltage between D9 (+ )terminal and A26 {-}terminal.
Sub{inno s known-good ECMand redrack. It pro.ctibod volt gola now availablg, ropllco tha orlg-inal ECM.
ls there approx. 5 V?
Turn the ignition switch OFF.
Reconnect "D" connector to themain wire harness,
Start tho engino. Hold the engine
!L3,099 rpm with no load (A/T in
LN] or El position, M/T in neutral)until the radiator tan comes on,rhen let it idle.
Measuro voltage between Dg (fl
terminal and 426 (- I terminal.
Does the voltage decreasewhen headlights and .eardelogger are turned on?Turn ths ignition switch OFF.
ALT FR rignal is OK.
o oo oo o ooooo
ooooooooooo
Voh.go?
ooooooooooo
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1 1-86
(To page 1 1-87)
=-

ldle Control System
Automatic Transaxle {A/Tl Gear Position Signal {A/T onlyl
This signals the ECM when the transmission is in @ or @ position.
appror. 5 V?
1 1-88
-.
87 l+)
ooooooooooooo
oooooooooooo
A26 {-}
Turn the ignition switch ON.
obsorve the A/T shift indicatorand s eiecl each positionseparately.
Soo A/T goa. position indicator in-spoqtion ls6o lection 141.
Turn the ignition switch OFF.
Connect the test hamess betweenthe ECM and connectors. Discon-nect "B" connoclorlrom the mainwire harness only, not the ECM(see page 11-37).
Turn the ignition switch ON.
Measure voltage between 87 (+ Iterminal and 426 1- ) terminal.
Subslituto . known-good ECM6nd .ech6ck. lf pr63cribod voltageia now availablo, rcplaco ths o.ig-inel ECM.
ls there approx. 5 V?
Turn the ignition switch OFF.
Reconnect "8" connector lo lhemaan wire harness.
(To page 11-89)

ldle ControlSystem
Brake SwitchSignal
This signals the ECM when the brake pedal is depressed.
11-90
Inlp.ction ot Brd(. Switcfi Siignal.
Are the brake lights on withoutdepressinO the brake pedal?ltuoacl ths braka .wilch {!.a !ac-don 191,
Inspect STOP, HORN (20 Allusein the undeFhood fuse/relav box.Oo the brake lights come on?
R.pl!c. STO P,HOR {2O A) tu...R.pdr dbrt In WtlT/GBI wlrr batu..nb?!ka .wltch a.rdsToP, HOR[{ (20 A}lura.
ls the luse OK.?
- Ropalr opon In WHT/GRN wirobatwoan b'lka lwltch andSTOP, HORTI {20 Al lu!o.- InlDect tho braka awitch la6a.6cdon 19).
Connect tho t€st harness to themain wire hamess only, not to theECM {see page 11-37).
(To page 'l1-91)

Fuel Supply System
Fuel Pump (cont'dl
Tc.ting
@E o" not smoko during tho tesr. Koop openflrmo away fiom your work area.
lf you susp€ct a problem with the tuel pump, check thatthe lusl pump actually runs; when it is ON, you will hearsome noise if you hold your ear to the luel lill oon withthe fuel fill cap remov6d. The fuel pumD should run fortwo seconds, when ignition switch is first turned on. llthe fuel pump does not make noiss, check as tollows;
1. Removo the rear seat (see section 2O).
-'2. Remove the access panel.
3. Disconnect the 2P connector from the fuel pump.
CAUTION: 86 lure to tum th6 ignition switch OFFbotor6 disconnoctlng th€ wilos,
4. Connect the BLK|yEL @ wire 8nd YEL/GRN @ wirewith a iumpe. wire 8t the PGM-FI main relav con-
nectot.
l.t, .--/ re -Fl. . MAll{ RELAY
BL&YELJumper
Check that battery voltage is available at the tuel
pump connector when the ignition switch is turned
ON (positive probe to the YEL/GRN wire, negativeprobe to ths BLK/WHT wire).
ACCESSPANEL
side
YEL/GRN
a lf battery voltage is available, replace the fuel
pump.
a It there is no voltage, check the tusl pump ground
and wire harness {see page I 1-1 l2).
11-110
Roplacomont
@ oo not smoks whilo worklng on fuel syr-
tem. Kaop opon llamos away from your wolk araa.
1. Remove the rear ssats {soe section 2O).
2. Remove the access oanel.
3. Disconnect the 2P connector from the fuel pump.
4. Remove the fuel pump mounting nuts.
5. Remove the fuel pump trom the luel tank.
6. Install a new washer on the banio bolt, then install
Darts in the revers€ order of removal.
6 N.mlO.6 kgl.m,.4 tbt.ftl
27 .m(2.4 kgt.m,21 tbt.ftl

(From page 'l'l-1121
Roplir op.n in GRI{/BLU wirc bo-tw..n ECM lATl lnd PGM-FImain rolay.
Measure the voltag€ betweenA23l- ) t€rminal and the tollow-ing t€rminals; A25 (+ ) Bl (+ ).
- Ropair opon in rh. YEL/BLKwir. @ b€twoon the ECM1A25, 8tl .nd PGM-FI mrinraLy.- Roplsc. ttro PGM+I min ru4.y.
Turn the ignition switch OFF.
M€asure the voltage betw€en A7(+)torminal and A23 { - } t€rmi-nal when the ignition switch isfirst turned ON for two soconds.
Subrlitutc . known{ood ECM.nd 6chock. lf p..crib.d volt.g.ir now avallablo, rodaco lha otlgi-nsl ECM.
ls there 1.O V or l€ss?
Chod. th6 FGM-FI fioin relay {3o.p6g6 11-1111.
Turn the ignition switch off.
Connect the test harnoss b€tweenthe EcM and conneclors.Oisconnect "A" connector tromthe ECM onlv. not the main wireharness (see page 1'1-37).
Check forGRN/BLUlermrnal.
continuity betweenterminal O and A7
YES
Reconn€ct "4" connector to theECM.
Turn the ignition switch ON.
Bstt.ry vohago?r-----r_-lA23 (-l A25 Bl
Brttaiy voftago?
a7 (+l A23A23 (-)
11-113

(From page 1 1-124)
Raise engine speed to above6,000 rpm.
Disconnect the 2P connector tromthe IAB control solenoid valve.
Turn the ignition switch OFF.
Check for continuity to ground onthe PNK/BLU wire.
Ropair short to g.ound
at PNK/BLU wiro bo-two6n ECM {A17) andtho 2P connector.
ls there continuity to ground?
Substituto a known-good ECMand racheck. It symptom goos
swsy, roplace tho original ECM.
{From pago 1 1-124}
Repsir op6n in YEL/BLKwiro botwoon tho 2Pconnector and FGM-FImain relaY.
ls there battery voltage?
Turn the ignition swirch OFF.
Connect lhe test harness betweenthe ECM and connectors lseepage 11-37).
Turn the ignition switch ON andconnect a lumper wke betweenECM (A17) terminal and ECM
{A26) terminal.
Ropaiiopon inP K/BLUwiao botwoen ECM
lAl7l and tho 2P con-nectot.
Ooes the solenoid valve clickwhen the jumper is con-nected?
Sub3titute a known-good ECMand rechock. lf symptom/indica-tion goos away, r6place tho origi-nal ECM.
Check lor vacuum at #'l3 vacu-um hose.
IAB control syst6m is OK.
11-125