1994 HONDA INTEGRA turn signal

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
System Troubleshooting Guide
NOTE:
a Acrosa each row in the chan, the sub-systems that could be sources of a symptom are ranked in the order they should
be inspected, starting with O. Find the symptom in the left column, read across to the most likely source, then reler
to the page listsd at ths top ot that column. It inspection showa the system is OK, try the next system @, etc.
a lf the idle speed is out of sp€cification and th€ Malfunction Indicator Lamp {MlL) does not blink Diagnostic Trouble
Code (DTC) 14, 9o to inspection describ€d on pags 1 1-81.
PAGE
SYMPTOM
IDTIOJUSTIiSCREW
IDLE AIRc0NTROt-
AIRcoN0fTtoNtitcSIGNAL
ALTER.NAION FNSIGNAL
AUTOMATICIRAI{SA(LEGtARP0sm0 stGIAt
ERAK€swrTcHSIGNAL
STARTERswtTcHSIGNAT
POWERSTEERII'IGPffESSUREswncHSIGNAL
FAST IOLETHERMO
HOSESANOCONNEC.TIONS
11-9511-4211-841 1-8611-8811-9011-92I 1-9311-94
DIFFICULT TO STARTENGINE WHEN COLD@o
WHEN COLD FAST IDLE OUT OFSPEC l1,0OO- 2,0OO rpm|o@o
ROUGH IDLEo
WHEN WARM RPM TOO HIGHooo
WHEN
TOO LOW
ldl6 3p6od b b€lowspecitisd rpm (no loadl@o
ldla 5p66d doos nolincraas€ alter initialo
On mod6l3 with auto-matic transmBsion, thsidlo sp€ed drops in 963ro
ldl6 sp€eds drops when8ir condilioner in ONoo
ldls spo6d drops when6ts6iing wh66l i6 turninC@o
ldla spoed lluctust63with alactrical loado
FREOUENTSTALLING
WHILE WARMING UP@o
AFTER WARMING UPo@
FAILS EMISSION TESTo
11-78
.,Hilffirl|,

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)

Power Steering Pressure (PSP) Switch Signal
This signals the ECM when the power steering load
-;"nection.*."------'.ill]
--
;;;;;;;l w
;:"r"tffa;i'
connecrors (see
Turn the ignition switch ON.
Measure voltage between 88 {+ )terminal and A26 {-) terminal.
is high.
o ooooo oooo ooo I oo ooo oo o l.Do€d(iltl ooooooooooo
o oooo ooo ooooQ I oooQ oo oo $aG$ast.l oooooooo oo
A26 l-) Bg l+l
L6s! thsn l.O V?
wire side
Turn the ignition switch OFF.
Disconnect the 2P connector tromthe PSP switch.
ls there less than 1.0 V?
Tu.n the ignition switch ON.
Turn steering wheel slowly.ls there less than 1.O V?
Measure voltage between B8 (+)
terminal and 426 (-) termanalwhile steering wheel is turning.
Ropair opon in GRN wire betwssnECM {88} and PSP srYilch ot BLKwi.o botw6cn PSP switch andG301 (locatod at loft ongin6 com-partm6ntr.
Disconnect the 2P connector lromthe PSP switch.PSP switch signal is OK.
Repair short in GRN wi.e botwoonECM {881 and PSP switch.ll wiro i3 OK, substitute a known-good ECM and.ocheck. lIproscribod vollage is now available, replaco tho original ECM.
GRN
PSP SWITCH
11-93

Fuel Supply System
PGM-Fl Main Relay (cont'dl
BLU
BLU/wHt
Bt-xNOTE:. M/T: Clutch pedal mustbe depressed.. A/T: Transmission in
N or E] position.
BLK/ YEL/YEL BLK
Tloubloshooting
{To page 11 113}
- Engino will not sran.- Inspection oI PGM-FI main re-lay and rolay ha.n6!a.
Check lor continuitv between BLKterminal @ and body ground.
Rapair open in BLK wire botwoonPGM-FI main.el6y and GIO'l llo-catod at thormostot housingl.
Measure the voltage betweenYELMHT terminal @ and bodyground.- Roplaco th. ECU IECMI(15 Allus6 in tho under-hood fu!o/r6-lay box.- Ropair opan or short in theYEL/WHT wil6 botwosn thePGM-FI main rolay and the ECU
{EcMl 115 A} luso.
ls there battery voltage?
Turn the ignition switch ON.
Measure the voltage betweenBLK/YEL terminal @ and bodyground.- Reolac. ths No. 24 ACG {ALT}{lcl {15 A:81881 6ngino, 20A: Bl8Cl engin6) tuse in thoundor-dash fuso/rolaY box.- Ropaii op6n or rhon in thoBLK/YEL wiro botwoen thoPGM-FI main ielay and th€ No.24 ACG {ALT) flG} {'15 A:818Bi ongine, 20 A: 818Cionginol fuso.Turn the ignition switch to theSTART position.
Measure the voltage betweenBLUMHT terminsl @ and bodyground.
- Replaco the l\lo. 18 STARTERSIGNAL {7.5 A} fuso in thoundor-dash fuaa/rolay box.- R6pai. open or short in thoBLU/WHT wire botweon thsPGM-FI main relay and tho No.1A STARTER SIGNAL I7.5 AIluse.
11-112

Lock-up Control
From sensor input signals, the TCM determines whether to turn the lock-up
solenoid valve A and/or B accordingly.
The combination of driving siqnals to lock-up control solenoid valves A and
ON or OFF and activates lock-up control
B is shown in the table below.
Lock-up control Solenoid valve
B
Lock-up condition \
Lock-up OFFOFFOFF
Lock-up, slightONOFF
Lock-up. haltONON
Lock-up. fullONON
Lock-upduring decelerationONDuty operationOFF-ON
Shifl Conrrol
The TCM instantaneously determines which gear should be selected by various signals sent trom sensors. and actuates
the shift control solenoid valves A and B control shitting. Also. a Grade Logic Control System has been adopted to control
shifting in E] position while the vehicle is ascending or descending a slope, or reducing speed.
Shift control solenoid valve
t"*b" ,t"-l
------\B
E,E
('l st)OFFON
(2ndlONON
(3rd)ONOFF
E(4th)OFFOFF
a(2nd)ONON
tr (lst)ONOFF
l-Rl {Reverse)ONOFF
(cont'd)
14-19