body HONDA INTEGRA 1994 4.G Owner's Guide

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 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

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
-

(From page 1 1-86)
Disconnect tho nsgstive bafterycable from the baftery.
Check for continuity betwe€n D9terminal and body ground.
Check for continuity betwoan D9te.minal and body ground.
soe AIT Inrpactlon(... r.ctlon 231.Check lor continuity between D9t€rminsl snd body ground.
Rop.lt C|on in WHT/RED wi.. b.-tw.on ECM lDgl rnd ALT.
Sao ALT inapactionlres .lctlon 231.
Disconnect "D" connector lromECM only, not the main wireharnesa,
Ropair op€o in WHT/RED wito b6-tween ECM {D9} .nd .ltomrtor.
Continuity?
11-87

ldle Control System
Fast ldle Thermo Valve
DEscliptlon
To prevent erratic running when the engine is warming
up, it is n€cessary to raise the idle speed. The fast idle
thermo valve is controlled by a thermowax plunger, When
the engine is cold. the engine coolant su.rounding the
thermowax contracts the plunger, allowing additional air
to be bypassed into the intake manifold so that the en-
gine idlss taster. When the engine reaches operating tem-
peratur€, the valve closss, reducing the amount of air
bypassing into the manifold.
FAST IDLE THERMOVALVE
AIN EYPASS VALVE
Inspaction
NOTE: The tast idle thermo valve is factory adiustsd;
it should not be disassombl€d.
1. Remove the intake air duct from the throttlg body.
2. Stan the engine.
3. Put your finger over ths lower port in throttle body
and make sure that there is 8ir flow with tho engine
cold (engine coolant temperatute below 86oF,
300c).
a lf not,
retest.
leplace the fast idle thermo valvs and
4.
o-Rr{GsReplace
llo kgf.m, 7 lbt.trl
Start the engine. Hold the sngine at 3.0OO rpm with
no load (A/T in I or @ position, M/T in neutral]
until the radiator fan comes on, then let it idl6.
Check thst valve is completely closed. lt not, air suc-
tion can be telt at the lower Don in the throttle body,
a It any suction is felt, the valve is leaking Check
engine coolant level and for air in tho engine
coolant system (see section 1O). ll OK, rsplace
the fast idle thermo valve and rechock.
11-94

lFrom psge 1 1-1021
(To p6ge I l-1O41
St6n the enoin€ 8nd listgn at oachfuol inioctor fo. a clicking sound.
Turn the ignition switch OFF.
Disconnoct tho 2P cohnector fromth6 lu€l iniocto. th6l does notclick.
Mossur€ rggistance batwson th€
2 terminalE ol fuol injocto..
R.phce tho fuol ini.ctor/lni.ctor!that ar€ not 10- 13 O.ls thoro 1O- 13 07
T!.n tho ignition switch ON.
Moaaur€ voltage b€tweonYEL/BLK { + I terminsl in ths 2Pconnoctor and body ground.
B.prh op.n In tho YEL/BLK wlt6botwaan tha luol inioctor aad lhaPGM- Fl main r.lsy.ls thore battory volt6g€7
FUELII{JECTOR
(cont'd)
11-103

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

Intake Air System
System Troubleshooting Guide
NOTE: Across 6ach row in the chart, the sub-systems that could be sources of a symtom are ranked in the order they
should be inspected st8rting with O. Find the symptom in the left column, read across to the most likely source, then
ret€r to the page listod at the top of that column. tf inspection shows the system is OK, try the next system @, etc.
181881 onglnol
't 1-11711-118
WHEN COLD FAST IOLE OUT OF SPEC
WHEN WARM IDLE SPEED TOO HIGH
lB18Cl cngin.l
PAGE I sue-svsreu
_\.-..\
sYMPToM \---...-
THROTTLE
CABLE
THROTTLE
BODY
INTAKE AIR
BYPASS (IAB)
CONTROL
AIR CLEANER
AND INTAKE
AIR DUCT
111191't -12011-1241l117
WHEN COLD FAST IDLE OUT OF SPECo
WHEN WARM IDLE SPEED TOO HIGHoo
LOSS OF POWERo@@
11-115

Intake Air System
System Description
The system supplies air for allengine needs. lt consists of the intake air pipe, Air Cleaner (ACL), intake air duct, Throttle
Body (TB), ldle Air Control {lAC) Valve, tast idle thermo valve, and intake manifold.
A resonator in the intake air pipe provides additional silencing as air is drawn into the system.
nacot{TRoLSOLENOIDVALVE
To
ffi -------------+ i'"ii'i''RELAY
VARIOUSSENSORS
IABCONTROLDIAPHRAGMVALVE
-BLK--L EI{GINE- cooLnnt
tFASTIDLETHERMOVALVE
U
INTAKEAIR PIPE
INTAKEAIRDUCT
11-116

lntake Air System
Throttle Body
Description
The throttle body is ot the single-barrel side-draft 1ype.
The lower portion of the throttle valve is heated by en-gine coolant from the cylinder head. The idle adjusting
screw which increases/dec.eases bvDass air and the
Evaporative Emission (EVAP) Control Canister port are
located on the top of the throttle body.
IOLE AOJUSTING
THROTTLESTOP SCREW(Non-adiustsb16l
11-120
Insoection
CAUTION: Do not adiust the thlottle stop screw. lt ispreset at the lactory.
1. Start the engine. Hold the engine at 3,OOO rpm with
no load (A/T in S or E position, M/T in neutral) until
the radiator fan comes on, then let it idle.
2. Disconnect the vacuum hose (to the EVAP control
canister) from the top of the throttle body; connect
a vacuum, gauge to the throttle body.
VACUUM PUMPGAUGEA973X-O41-XXXXX
5.
3. Allow the engine to idle and check that the gauge
indicates no vacuum.
a li there is vacuum, check the throttle cable (see
page 1 1-'l 18, 119).
Check that vacuum is indicated on the gauge when
the throttle is opened slightly from idle.
a lf the gauge indicates no vacuum, check the throt-
tle body port. lf the throttle body port is clogged.
clean it with carburetor cleaner.
Stop the engine and check that the throttle cable
operates smoothly without binding or sticking.
a lf there are any abnormalities in the above steps,
check for:
- Excessive wear or Dlav in the throttle valve shaft.
Sticky or binding throttle lever at full close po-
srtron.
Clearance between throttle stop screw and throt-
tle lever at tull close Dosition.