1999 HONDA CIVIC pan

ldle Control System
ldle Air Control (lACl Vatve ('96 - 98 Dl6ys, Dl6yB engine with M/Tl
The scan tool indicates Diagnostic Trouble Code (DTC) P1508: A problem in the ldle Air Controt flAC) varvecircuit.
The IAC Valve changes the amount of air bypassing the throttle body in response to a current signal from the ECM inorder to maintain the proper idle speed.
IAC VALVE 2P CONNECTOR ICl3A)
,flrcerh-:J iYEL/BLKI
!.__-,/ -lt(v)
-T-=
Wire side of female terminals
tAcv(BLK/
ELUI
ECM CONNECTOR A I32PI
Wire side oI lemal€ terminals
VALVE
6a10ll12t3r5t6l7t8t920232a
t*25&a2A3o
The MIL hss b€on repo.ted on.DTC P'l508 i. itorod.
Problem vorification:1. Do the ECM/PCM Reset Pro-cedure,Start the engine, and warm ituP to normal operating tem-perature.
Intormittont t!llur., sy.tcm b OKat thb tim6. Chsck fol poor con-ncctionr or loo3e wirot at C138(lAC valv.l.nd ECM.
ls DTC P1508 indicated?
Check for an opcn in the wiro(lGPl line):1. Turn the ignition switch OFF.2. Disconnect the IAC valve 2Pconnector.3. Turn the ignition switch ON (ll).
4. Measure vohage between bodyground and the IAC valve 2Pconnectorterminal No. 2.
R.prir opan in the wiro botwa.nIAC valv..nd PGM-FI main r.l.y.
Chock for an opon or sho in thewire (IACV linal:1. Turn the ignition switch OFFand reconnect the IAC valveconnector.2. Disconnect the ECM connectorA (32P).
3. Turn the ignit;on switch ON (ll).4. Measure voltage betweenbody ground and ECM con-nector terminal A12.
(To page 1l-195)
11-194

t
lFrom page 11-198)
Chock for an opon in tho wilo(lGP lins):'1. Turn the ignition switch OFF.
2. Disconnect the IAC valve 3P
connector,3. Turn the ignition switch ON (ll),
4. At the wire hamess, measure
voltage between IAC valve 3P
connector terminal No. 2 and
body ground.
Raprir op€n in th€ wirc botw.€nth. IAC vrlv6 and PGM.FI mtin
rehy.ls there baftery voltage?
Check for rn open in tho wil.s(IACV P,IACV Nr linesl:
1. Turn the ignition switch OFF.
2. Disconnect the ECM/rcM con-
necror A (32P).
3. Check for continuity betweenIAC valve 3P connecto. terma_nal No. 3 and ECM/PCM con-nector terminal A14 (a nd
between IAC valve 3P connec-tor terminal No. 1 and ECM/
rcM connector terminal A13l*.
Ropair opan in tha wito bgtwoon
ths IAC vrlv! rnd ECM or PCM
{A14, 413.1.
Check for e lhort in tho wiros(IACV e nCV Nr linc):
Check for continuity between
body ground and ECM/PCM con-
nector terminals A14 and A13*
individually.
Rapair rhort in thr wi]. batwaonth. IAC v.lvc .nd ECM/PCfvl {A14,Ar3.t.ls there continuity?
Check the IAC V.lvo:1. Disconnect the IAC Valve 3P
3. Measure resistance betweenIAC Valve 3P connector termi-
nai No. 2 and terminals No. 1
and No. 3 individuallY.
ls there 16 - 28 O?
Subrtituto a known-good ECM/PCM and r€ch€d( lt .vmptom/indicalioo gp€. .way, ruplace tho odgiml Eqvt/FCM.
IAC VALVE 3P CONNECTOR IClG'}
IGP IYEL/BIX)
tAcv N (oRNt*
IACV N
Wirc side of lemale teaminals
IAC VALVE 3P CONNECTOR
IACV P
Terminal side of mal6tetmtnats
(32P)
ll
toRNt*tIIACV P(BLK/8LU}
ECM/PCMCONNECIOR A
IACV P(BLK/BLU}
Io,tl0't1
1Z13ta15l617tal9mx22321
2521i6a3o
,|31.57aIl0tl
12t3r. lrst511r8t92022232a
272aA30
IACV P (BLK/SLU}
rla
-: IACV N line
1 1-199

I
Fuel Tube/Ouick-Gonnect Fittings
Precautions
!@ Do not smoke while working on the fuel
system, Keep open flames away from your work a.ea'
The fuel tube/quick-connect fittings assembly connects
the in tank fuel pump with the fuel feed pipe. For remov-
ing or installing the fuel pump and fuel tank, it is neces-
sary to disconnect or connect the quick-connect fittings.
Pay attention to lollowing:
. The fuel tube/quick-connect fittings assembly is not
heat-resistant; be careful not to damage it during
welding or other heat-generating procedures
. The fuel tube/quick-connect fittings assembly is not
acid-proof; do not touch it with a shop towel which
was used for wiping battery electrolyte. Replace the
fuel tube/quick-connect fitlings assembly if it came
into contact with electrolyte or something similar.
. When connecting or disconnecting the fuel tube/
quick connect liltings assembly, be careful not to
bend or twist it excessively. Replace it if damaged
A disconnected quick-connect fitting can be reconnecled,
but the retainer on the mating pipe cannot be reused
once it has been removed from the pipe. Replace the
retatner wnen
. Replacing the fuel pump.
. Replacing the fuel leed pipe.
. lt has been removed lrom the PiPe.. lt is damaged.
ACCESS PANEL
I
Disconnestion
!@ Do not smoke while working on the luel
system. Keep open llames away lrom youl work area.
1. Relieve fuel pressure (see pages 11'230,2311.
2. Check the tuel quick-connect tittings for dirt, and
clean if necessary.
3. Hold the connector with one hand and press down
the retainer tabs with the other hand, then pull the
connector off.
NOTE:
o Be carelul not to damage the pipe or other pans
Do not use tools.
. lf the connector does not move, keep the retainer
tabs pressed down, and alternately pull and push
the connector until it comes off easily.
. Do not remove the retainer from the pape; once
removed, the retainer must be replaced with a
new one.
LOCKING PAWL
BETAINER TAB
CONNECTOR
Check the contact area o{ the pipe for dirt and dam-
age.
. lf the surface ls dirty, clean it.
. lf the surface is rusty or damaged, replace the
fuel pump or fuel feed piPe.
4.
(cont'd)
11-227
PIPE

t
Belore connecting a new fuel tube/quick-connect fining
assembly, remove the old retainer from the mating pipe
with thetabs pulled
apan, removeand discard the
I
retarner
New FUEL TUBE/OUICK.CONNECTFITTING ASSEMELY
3. Align the quick-connect fiftings with the pipe, and
align the retainer locking pawls with the connector
grooves. Then press the quick-connect fittings onto
the pipe until both retainer pawls lock with a click-
ing sound.
NOTE: lf it is hard to connect, put a small amount
of new engine oil on the pipe end.
Connection with new retainer:
4. Make sure the connection is secure and the pawls
are firmly locked into place; check visually and by
pulling the connector.
RCTAINER
Reconnect the battery negative cable, and turn the
ignition switch ON (ll). The fuel pump will run for
about two seconds, and fuel pressure will rise.
Repeat two or three times, and check that there is
no leakage in the fuel supplv system
11-229

Fuel Supply System
Fuel Pump
Testing
!@ Do not smoke during the test, Keep open
flame away from your work atea,
lf you suspect a problem with the fuel pump, check that the
fuel pump actually runs; when it is ON (ll), you will hear
some noise if you hold your ear to the fuel fill port with the
fuel fill cap removed. The fuel pump should run for two
seconds when ignition switch is first turned ON (ll). lf the
fuel pump does not make noise, check it as follows:
L Remove the seat cushion {see section 20).
2. Remove the access panel from the floor.
3. Make sure the ignition switch is OFF, then discon-
nect the Iueltank 2P connector.
4. Connect the PGM-FI main relay 7P connector termi-
nal No. 4 and No. 5 with a jumper wire.
PGM-R MAIN RELAY 7P CONNECTOR lC4,(|l
FUEL PUMP
IYEL/GRN}
IGN 1(YEL/GRNI
tcs6s)
FUEL PUMP(YEL/GRNI
Wire side oftemale torminals
JUMPER WIRE
Wire side of temale terminals
Check that battery voltage is available between the
fuel pump connector terminal No. 1 and body ground
when the ignition switch is turned ON (ll).
CONNECTOR
=
[t
L3l .i)
T
lf battery voltage is available, check the fuel pump
ground. lf the ground is OK, replace the fuel pump.
lf there is no voltage, check the wire harness (see
page 11-238).
11-236
Replacement
@E Do not smoke while working on tuel svs-
tem. Keep open llames away from your work area.
1. Remove the seat cushion (see section 20).
2. Remove the access panel trom the floor.
3. Disconnect the 2P connector from the fuel pump.
4. Remove the fuel pump mounting nuts.
5. Remove the fuel pump from the fuel tank.
6. Install pans in the reverse order of removal.
ACCESS PANEL
i

IFuelTank
'96 - 98 models:
Replacement
I
1. Relieve the fuel pressure (see pages \1-230' 23'll'
2. Remove the seat cushion (see section 20).
3. Remove the access panel from the floor'
4. Disconnect the 2P (C565) and 3P (C564) connectors ('96 D]6Y8 engine (coupe) '97 D16Y/ engine(coupe: KL model'
sedanKL(LX)model).'97D'l6YSengine(coupe:allmodels'sedan:KLmodel'98-allmodels):and6P(C568)connec-
tor),
5. Disconnect the hose and quick-connect fittings (see pag es'l'l-225' 2271
6. Jack up the vehicle, and support it with jackstands'
7. Removethefuel tank cover ('96,'97 model) orthefuel hose joint protector'
8. Bemovethedrain bolt,and drainthefuel into an approved container'
9. Disconnect the hoses {see page r i-izst. Sria" nu"i ihe clamps, then twist hoses as you pull, to avoid damaging them'
10. Place a jack. or other support, under the tank'
11. Remove the strap nuts, and let the straps fall free'
12. Removethefuel tank lf it sticks on the undercoat applied to its mount' caref u lly pry it off the mount'
13.|nsta||thedrainbo|twithanewwasher.thencoatthedrainbo|twithNoxrustl24B,A||owtheNoxrustdryfor20min-
ules.
14. Installthe remaining pans in the reverse order of removal'
SASE GASKETReplace.
BASE GASKETReplace.
!@@ Do not smoke while working on fuel system' Keep open flame away from your work ar'a'
TANKSTRAPS
DRAIN BOLT,19 N.m {5.0 kgt m, 36 lbf.ftl(cont'd)
11-241

Fuel Supply System
Fuel Tank {cont'dl
39 - (xt models:
Replac6ment
o
@ Do not smoke whire working on fuer system. Ke€p open frama away trom your work area.
1. Relievethefuel pressure (see pages 11-230,23'll.
2. Remove the seat cushion lsee section 2O).3, Remove the access panel fromthefloor.
4. Disconnectthe2P (C565) and3P(CS64) connectors and 6p (C569) connecror.5. Disconnect the hose and quick-connect fiftings (see pages 1l-226,22j),6. Jack up the vehicle, and support it with jackstands.
7. Removethefuel hose joint protector and heat shield.8. Removethedrain bolt. and drainthefuel intoan aporoved container.9 Disconnect the hoses (see page 11-226). Slide back the clamps. then twist hoses as you pull, to avoid damagtng rnem.10. Place a jack, or other support, under the tank,11. Remove the strap nuts, and let the straps fallfree,'12. Removethefuel tank. lf itsticks onthe undercoat applied to its mount, carefully pry itoffthe mount.13. Install thedfain boltwith a new washer. then coat the d rain bolt with Noxrust 124B,Allowthe Nox.ust drv for 20 min-utes.
14. Installthe remaining parts in the reverse order of removal,
Replace.
DRAIN BOLT,19 N.m (5.0 kgf.m, 36lbf.ft)
11-242

Emission Gontrol System
System Description
The emission control system includes a Three Way Cata-lytic Convener (TWC), Exhaust Gas Recirculation (EGR)
system,. Positive Crankcase Ventilation (pCV) system andEvaporative Emission (EVAP) Control system. The emis-sion control system is designed to meet federal and stateemission standards.*: D16Y5 engine
Tailpipe Emission
Inspestion
@@ Do not smoke during ihis procedure. Keepany open flame away from your work area.
1. Start the engine. Hold the engine at 3,000 rpm withno load (in Park or neutral) until the radiator fancomes on. then let it idle.
2. Connect a tachometer.
Check and, if necessary, adjust the idle speed (see
page 11-220 - 223).
Warm up and calibrate the CO meter according to themeter manufacturer's instructions.
Check idle CO with the headlights, heater blower,rear window defogger, cooling fan, and air condition-er off.
NOTE: (Canada) Pull the parking brake lever up.Start the engine, then check that the headlights areoff.
CO mete. should indicate 0.1% maximum.
NOTE: '98 Dl6Y5 engine - lf the idle speed incress-es to 8101 50 rpm, this means the EVAp system ispurging the canister. To stop the purging temporari-ly. raise the engine speed above 1,000 rpm with theaccelerator pedal, then slowly release the pedal.
11-252
eFORWARD -
Three Way Catalytic Converter
(TWCI
Doscription
The Three Way Catalytic Converter (TWC) is used toconven hydrocarbons (HC), carbon monoxide (CO), andoxides of nitrogen (NOx) in the exhaust gas to carbondioxide (COr), dinitrogen (N,) and water vapor.
D15Y5, D16
, engine:
'99 - 00 D16Y8, 81642 engine:
ENGINE SIDE
t