1994 HONDA INTEGRA system connectors

How to Read Flowcharts
A flowchrrt is dasigned to be us€d fiom start to final repair. lt's like a map showing you the shortest distanco. But be-
ware: if you go off tho "map" anywhere but a "stop" symbol, you can easily get lost
l6rffil Desclibas the conditions or situation to start a troubleshooting flowchart.(bold tyDo)
|TeTiONl Asks you to do something; pedorm a test, set up a condition etc'
<:6Eei6io-fr\> Asks you about the result of an action, then sends you in the appropriste troubleshooting direction.
I-SJTFI The snd of a series ot actions and decisions, describes I tinal repair action and aomotimea diracts
(bold typel you to 8n garlier part of the tlowchart to confirm your repair'
NOTE:
a Tha tarm ,,lntormittgnt Failure" is used in these chans. lt simply means a system may have had a failur6, but it chocks
out OK !t this time. lf th6 Msltunction Indicator Lamp (MlL) on ihe dash does not come on, check for poor connections
or loose wires at all connectors rolated to the cilcuit that you are troubleshooting (see illustration b6low).
a Most ot tho troublashooting flowchans have you reset the Engine Control Module (ECM) and try to duplicate the Disg-
nostic Troubls Cod6 (DTC). lf the problem is intermittent and you c8n't duplicat€ the cod6, do not continus through
the flowchart, To do so will only rosult in confusion and, possibly, a ne€dlessly replaced ECM
a ,,opon,'and ,,short,, are common electrical terms. An open is a break in a wir6 or at a conn€ction. A short is an
accidontal connaction ot a wir€ to ground or to another wire. In simple electronics, this usually means som€thing won't
work at all. In complex electronics (like ECM's), this can sometimes mean something wolks, but not the way it's sup-
poSad to,
a il th6 olectricsl readings are not as specified when using the test harness, check the test harness connoctions bsfore
procooding.
LOOSE
11-39

PGM-FI System
Engine Control Module (ECM)
lB18B1 ongino onlyl
The Malfunction Indicator Lamp(MlL) n6v6. com6s on lovon follwo socondal aftor ignition istumed on.
lurn the ignition switch ON.
Inspect No. 15 {BACK-UP LIGHT}l1O A) luse in the underdashtuse/relay box.ls the low oil pressure light on?
- R€placo No. 'l5
IBACK-UP LIGHT)llo Al fuso.- Ropair short inYEL wiro botwoonNo. 15 (BACK-UP
LIGHT) {10 A) fusoano gauge 6$om-blv.
Turn lhe ignition switch OFF.
ls the fuse OK?
Connecl the test harness betweenthe ECM and connectors (seepag€ 11-37).Repair opon in YEL wiio botw6onNo.'15 IBACK-UP LIGHTI 110 A)luso and gaug6 assombly.
Turn the ignition switch ON.
- RsDlaco tho MIL bulb.- Ropair opon in GRN/ORN wi.ebetwoen ECM {A13} andgaug€ a$6mbly.
ls the MIL on?
Measure voltage between body
Oround and the tollowing termi-nafs individuallv: 423, 424.
Ropah op6n in BLK wirolsl bo-tw6en ECM and GlOl llocatod atthormostat housing) that hadmoro than 1.0 V.
ls there less than 1.O V?
Substituto a known-good ECMand rochgck, lf symptom/indica-tion go€s away, roplaco tho origi-nal ECM.
NOTE: lf this svmptom is intermittent. check for a loose fuse No. 15 (BACK
UP LIGHT, 1OA) in the under-dash Juse/relay box, a poor connection at ECM
terminal A13, or an intermittent open in the GRN/ORN wire between the ECM(A13) and the gauge assembly.
I A13
I| | o oooo oooooooo I oooo oooo I ooooool ooooooooooo I
G 10'l
11-42

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 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.
ooooooooooooo
oooooooooooo
oooooooo
oooooooo
ooooooooooo
ooooooooooo
.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
ooooooooooo
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)

Fuel Supply System
Fuel Injectors (cont'd)
(From page 'l1-103)
Turn lhe ignition switch OFF.
Reconnect the 2P connector tothe tuel injector.
Connect the test harness betweenrhe ECM and connectors {seopage'11-371.
Turn the ignition switch ON.
Measure voltage between A23{-) terminal and followingterminal:. No. 1 tuel injector:A1 (+ ) terminal.. No. 2 fuel injector:A3 {+ I terminal.. No. 3 fuel injector:A5 {+ ) terminal.. No. 4 fuel injector:A2 {+ ) terminal.
Ropair opon in the wi.o betw6onth6 ECM (A1, A3, A5 or A2l andth6 tuel iniector.
Sub3titute a known-good ECMand r6chock. lf symptom/indica-tion goes away, .eplsco tho origi-nal ECM.
oooooooooo
oooooooooooooooooooo
oooooooo
ooooooooooo
ooooooooooo
A3{+)
A2{+}
11-104

Fuel Supply System
Fuel Tank
Replacement
@ oo not smoke while working on fusl syltem. Koep opon flame rway from your wort ar6a.
1. Relieve the fuel pressure {see page 11-1OO).
2. Jack up the car and support with jackstands.
3. Remove the drsin bolt and drain the fuel into an approved container.
4. Remove the rear seat, access Danels and disconnect the 2P and 3P connectors.
5- Remove the EVAP two way valve cover and tuel hose protector.
6. Disconnect the hoses.
CAUTION:
a Whan disconnacling tho hosos, slide back tho clampr, th6n twist horos as you pull, to lvold drmlglng thcm.
a Clean the tlarod roint ot high plossulo hosos thoroughly brforc roconnccling thsm.
7. Place a jack. or other support, under the tank.
8. Remove the strao nuts and let the straDs tall free.
9. Remove the Juel tank.
NOTE: The tank may stick on the undercoat applied to its mount. To remove, caretully pry it off tho mount,
1O. Install a new washer on the dlain bolt, then install psns in the raverse ordgr ot rsmoval.
FUELPUMP
EVAPTWO WAY VALVE
38 l{.m(3.9 kgt'm,28 rbl.ftl
FUELTANK
EVAPTWO WAYVALVECOVER
FUEL TAI{KSTRAPS
tO t{.mll.O kgt'm,7 lbl.frl
11-114

Electrical Troubleshooting
Troubleshooting Flowchart
ls the MIL blinking?
fs the voftage 4.75 5.25 V?
Possible Cause
. Disconnected lock-up controlsolenoad valve A connector. Short or open in lock-up controlsolenoid valve A wire. Faulty lock-up control solenoid
NO
YES
Repair open or shorl in WHT/BLK wir€ botwe€n th€ D18 termi-nal and the ECM.
(-)
| | o " q " " o o o o o o o q litigse.*grq$:,1:d:sd:siia:l " "" o " " o o oo " I
I ro'r+ r rz6 r-tL--- l /trtr-- l
ls there voltage?
NO
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oooooooo9oo
oooooooooooo
oooooooooooo
A25
Turn the ignition switch ON.
Check whether the MalfunctionIndicator Lamp (MlL) blinks (see
section I 1).
Repair the PGM-FI System (see
section 1 l ).
Turn the ignition switch OFF.
Disconnect the 26P and 22P con-nectors from the TCM.Connect the Test Harness "A"
and "D" connectors to the wireharness only, not to the TCM {seepage 14-49).
Turn the ignition switch ON.
Measure the voltage between theD18 and A25 or 426 terminals.
Measure the voltage between the46 and A25 or A26 terminals-
Repail short to power sourco inYEL wi.e between the A6 termi-nal and the lock-up control sole-noid valve A.
Turn the ignition switch OFF.
To page 14'53
14-52