1994 HONDA INTEGRA Workshop Manual

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
--

ECT SENSOR
GRN/BLU {-}
Turn the ignition switch ON.
Measure voltage betweon RED/WHT and body ground.
Measure voltage between RED/WHT {+}terminal and GRN/8LU(- ) terminal.ls there approx. 5 V?
ls there approx. 5 V?Ropai. opon in GRN/BLU wiro botwoon ECM(D221 and tho ECT36n3('r.Turn the ignition switch OFF.
Sub3tituto a known-good €CMand rochock. lf 3ymptom/indica-tion go6s away, roplaco the odgi-nal ECM.
Oisconnect the 22P connectortrom the Transmission ControlModule (TCM).
Turn the ignition switch ON.
ls there approx. 5 V7
Turn the ignition switch OFF andreconnect the connector to theTCM.
Connect the test harn€ss "D"
connector to the ECM only. not tothe main wire harness {see page11-37).
Turn the ignition switch ON.
Measure voltage between D13(+) terminal and D22 (-l ter-mlnal.
Repair opoa or shon inREO/WHT wiro botwoen ECMlDl3l and th6 ECT sonsor.R6pair shon in REO/WHT YYi..b6tw66n ECM {D131and TCM.
ls the.e approx. 5 V?
Substiluto a known-good ECMand rochock. ll lymptom/indica-tion goea 6wsy, replaco tho o.igi-n6l ECM,
A/T only
I
_i
11-59

.:-\.-----ll@l--l t l- The Malfunction Indicator Lamp (MtL) indicatee Diagnostic Trouble Cod€ (DTC) 7: A problcm inrhe Thronle Position (TPl Sonsor circuit.The TP Sensor is a potsntiometer, lt is connected to the throttle valve shaft. A8 the throttlo position chan96, the throttlopositaon sensor varies the voltage signal to the ECM.
BBUSHHOLDER
PGM-FI System
Throttle Position (TPl Sensor
OUTPUT VOLTAGE IV)
BNUSH
RESISTOF
IXNOTTII
TERMIIIAL;0rr- of€ no
THNOTTIE
YEL/aLU l+l TP SEITSOR
I
a
t
t
Io.|o
RED/BLK {-I
cnn/BLu I - l
)ran1 )ril-Y- -?..
- Th. MIL h.. baln rlport d on.- With th. SCS thort conn.ciolconn.c-ted (rco pngc 11-341.codo 7 i. indlc.t d.
Do the ECM Reset hocedure (se€page l 'l-35).
l. ..mrtt nt fClur., lyrt m la OX.t thb dm. ll.at drlv. rn.y brncoaataryl.Chack lor poo? connactlo|ra otloora wlr.r !t C223 lloc.t d !tdgtn drod( tow..t, Cl15 ITP ...t-rorl, C419 (TCMI .nd ECM.
ls the MIL on and do€s itindicats codo 7?
Turn th€ ignition switch OFF.
Disconnect tho 3P connector lromth€ TP sensor.
Turn the ignition switch ON.
Meosu.o voltage betwoon YEL/BLU (i ) terminal and GRN/BLUI -, torminal.
Measurs voltagG betw66n YEUBLU (+l terminal and bodygiound.ls there approx. 5 V?
(To page 1 1-611
11-60
(To page 1 1-6'l )
,,,----

(From1 1-60){From
A/T only
Turn the ignition switch OFF.
Connect the test harness betweenthe ECM and connectors (seepage 11-37l-.
Turn the ignilion switch ON.
Measure voltage between D1 1 {+ )terminal and 022 (- I terminal.
Turn the ignition switch OFF.
ls voltage approx. O.5 V at lullclose throtlle. and approx. 4 vat full open throttle?NOTE: There should be asmooth transition as the throt-tle is depressed.
Disconnect the 22P connectorfrom the Transmission ControlModule (TCM).
lurn the ignition switch ON.
Substitute a known-good ECMand roch6ck. ll symptom/indica-tion 9063 away, roplaco th6 origi-nal ECM.- Replaco tho TPaonsoa,- Repai. opon or ahonin RED/BLK wir. b€-twoon ECM lDl1l,TCM 6nd TP sonsor.
ls voltage approx. 0.5 V ar fullclose throttle, and approx. 4 Vat tull open throttle?NOTE: There should be asmooth transition as the throt'tle is deprossod.
page 1 1-60)
Repsir op.n in GRN/8LU wii6 botwoon ECMlD22l snd tho TPaenaot.
ls there approx. 5 V ?
Turn the ignition switch OFF.
Connect the test hamess betweenthe ECM and connector {see page11-37).
Turn the ignition switch ON.
Measure voltage between D2O{+) terminsl and D22 {-}termtnal,
Ropoi. open in YEL/BLUwire bgtween ECM{D20} and rho TP30naot.
ls there approx. 5 V 7
-ReDai. ahort in YEL/BLU wiroborwoon ECM (D2Ol and tho TPson30t.-Sub3tituto a known-good ECM6nd rochock. It prcacribod vol-t6go is now availablo, roplacoth6 original ECM.
Fr. o.5 v n tua .b drdn ?
11-61

PGM-FI System
Intake Air Temperature (lAT) Sensor
----:-- z ---L /-h6l- I t0 l- The Malfunction Indicator Lamp (MlL) indicstes Diagnostic Trouble Cod6 (DTC) 1O: A problem in/ | / - the Intake Air TemDerature (lAT) Sensor circuit,
The IAT Sensor is a temperature dependant resistor (the.mistor). The resistanc€ of the thermistor d6creases 8s the
intake air temDeratura incroases as shown below.
)1611:till/ ---l- z ---i-\
THERMISTOR
RED/YELI + )
RESTSTAXCE tmt
Bl8Bl onglnc:
-a a2 aa roa .t7a 212 a t |l-20 o 20 rto ao I t6 rro t.cl
I TAKE AIR TEiiIPTFATURE
818C1 .nglnc:IAT SEI{SOR
11-62
wi.a sido
- Th! *llL hs b!!n Egortad on.- \|
rdr dra SCS rhon connrcto.conn.ct.d lt . psg. 1l-341.cod. 10 l. hdlclt.d.
Do the ECM Resot kocoduro {se€pago 11-35).
Turn the ignition switch ON.Into.n{tlont failuro. rys-r.m ir OK .t thi. iim.(toat drlvc m6y b6arooa!!1ryt.Ched( tor poor clnncc-lioiE or loote wlrar 6tC223 lloc.tod rightlhock toworl, C12O(lAT renrcrl and ECM.
ls the MIL on and doos itindicate code 10 ?
Turn the ignition swiich OFF.
Oisconnoct tho 2P connector fromthe IAT sensor.
Meosu.e resistonc€ between the2 torminals on the IAT aengor.
ls thero 0.4-4.0 k0?Rlobco tho IAT aonsor.
(To pago 1'l-63)

{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 '. 1 1-63

PGM-FI System
Barometric Pressure (BAROI Sensor
fAl- f;ff: The Maltuncrion Indicator Lamp (MtL) indicates Diagnostic Troubte Code (DTCI 13: A probtem inL--:g the Barometric Pressure {BARO) Sensor.
The BARO Sensor is built into the ECM.
-.+.-- \--r- /
t(gt -t 13 t-/'\/_i-\
- Tho MIL has booo reponod on.with th6 scs Short COnnOCtO.connoctod (aeo psgo 11-34),cod€ 13 is indicatod.
Do the ECM Reset Procedurc (seepage 1'l-35).
Turn the ignition switch ON.
Intormitt€nt trluro, sys-tem is OK !l this timo{le!t driv6 msy bonecoSaaiy).
ls the MIL on and does it indicatecode 13 ?
Substituto . knorvn-good ECMand reck6ck. lt symptom/indicr-tion goes away, roplaco th6 origi-nal ECM.
11-64
lrl$fiiHrfi.

PGM-FI System
lgnition Output Signal
i16;11 :ffi1 The Malfunction Indicator Lamp (MlLl indic8tes Diagnostic Trouble Code (DTC) 15: A probl€m in'--=-- . -r- t the lgnition Output Signsl circuir.
I
NOTE| ll the onoine won't stan. itmay take 20 seconds ot cranking to5€t th€ COde.
D|STNIBUTOB
wir6 sido
- Th. MIL hsr b..n roport.d od.- Widr ths SCS .hon cohnecto.connoct€d {..o plgo 11-341,codg |5 i! indicatrd.
Do the ECM Reset ftocedure (seepage 'l'l-351.
Intarmltt nt hllur.. ryltam i. OK!t drlr dm. (t |l drlva mly bonaoaaalry).Chack tor Door cmnactiona orloo|. rYlrar !t C223 llocltld !trlghr .hoct tow.rl, Cl10 (lCMl.nd ECM.
ls th€ MIL on and do€s it indicatecode 15 ?
Turn the ignition swirch OFF.
Turn the ignition switch ON.
Measure voltage betwoon BLK/YEL (+) terminal snd bodygrouno.
R.p.ir op.n In BLK/YEL wlr. bo-ftvarn th. 2P conn.cior lnd ioni-tion rwitch.
ls the.e battory voltage ?
(To page 11-67)
11-66
re*,