1994 HONDA INTEGRA ecm connector

(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)

Disconnect the "B" connectorfrom the ECM only, not the mainwile hatness.
Turn the ignition switch ON.
Block tho right front who€l andslowlv rotate l6ft front wheel andm€asure voltage between 8'l Ol+) terminal and A26 (-)
terminal.- Roo.ir lhort in ORt{wire belween ECM18101 tnd rhs VSSor cruia6 controlunit.- ncp.i. op€n in ORI{wira botwoan ECM(8101 and the vSS.- It wir. i! OK, totttho vSS. lsoc aec-tion 231
Doos voltage pulso O V and'to v?
SubrtituL . known-good ECil lndEch.ck. fi lynptom/ndcltbn gp..
rw!y, .rpleco lh. original ECM.
(From page 1 1-68)
1 1-69

(From pog6 1 1-7Ol
Meaauro voltage betweon GBN/RED ierminal and body ground.
Boplir opon 01lhort in GR /REDwir. batworn ECM (DlOl and tho
3P connoctor.1l wir. i! OK, .ubrtituta. known-good ECM .nd rochock.
13 the.e approx, 5 V?
Turn tho ignition switch OFF.
connect tho loat hamasa botweontho ECM and connectors (soa
pag€ 11-37),
wire side
BLK {_I
GR /NED I-I
BLKIEL { + }
(To page 11-72)
11-71

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)

(From page 1 'l-76)
Check for continuity on GRN/BLUor GRY'wire between 83 or 84'and 22P connector of the TCM.
Ropair open in GRN/BLU or GRY'wiro botwoon ECM lB3 or B4'land the TCM,
Substituts a known-good ECMand rochock. ll symptom/indica-tion goos 6way, roplaca tho origi-nal ECM.
11-77

ldle Control System
ldle Air Control (lACl Valve
lt6l- -l lf l- The Maltunction Indicator Lamp (MlL) indicates Diagnostic Trouble Code {DTC} 14: A problem in
' '- the ldle Air Control llAC) Valve circuit.
The IAC Valve changes the amount of air bypasEing the throttle body in respons€ to a current signal from the ECM in
order to maintain the proper idle speed.
ffi: r;611/ | /--T-\
- The MIL h.3 been report don,- With tho SCS shon connoctolconnoctod (soo pago 'l 'l -341,
cod6 14 is indicatod.
Do the ECM Reset Procedure (seepage 11-35).
With the engine running snd theaccelerator pedal releas€d, dis-conn€ct th€ 2P connector frorttho IAC valvo.
ls the MIL on and does it indicatecode 14?
htarmitlaot frlu]., aya-t.m i. OK !t thir tlft.
ll.rl drlv. mly ba nac-aaaaryl.Chack tor Doo. conn€c-tlonr oi loora wirca atC3O5 (loc.t.d .t |.ftlhock tow.tl, C424,Cl tB (lAC v.lvol .ndECM.
Disconnect the 2P connector fromthe IAC valve.
Sub.iituto . known{ood IACvdva lnd iotolt.
{To page 11-83}
11-82

(From page 'l 1-82)
Measure voltago between theYEL/BLK wire and bodv ground.
R.pair op.n In YEL/8LK who b.-twoon IAC vCvc dd PGM-FI mdnrelay.ls th€rs battery voltage?
Turn th€ ignition swirch ott andreconnect thg 2P cohnector to theIAC valve.
Conn€ct the test hs.ness "A"
connector to the main wirs hrr-n6ss only, not the ECM lsee page
t 1-37).
Tu.n tho ignition switch ON.
Momentarily connect Ag torminalto 423 terminol seveaal tim€s.
Sub.titutr ! known{ood ECM.nd ral..t. lt .ymptom/hdlcatioogoa! awsy. rophca tia origlnalECM.
Does th6 IAC valve click?
Raplir op.n or rhort in 8LK/BLUwl]. b.tw.cn IAC v!lv..nd ECM(A91, It th. wlro L OK, r.Dhc.lheIAC v.lv..
IAC VALVEBLK/BLU { _ }
JUMPER WIRE
A9 l+) A23 {-l
1 1-83