fuel HONDA INTEGRA 1998 4.G Repair Manual

Testing
@G Do not smoke during the test. Keep opon
flames away lrom your work ar€a.
1. Attach a fuel pressure gauge to the service port of
the tuel filter (see page 11-118).
Pr€ssurs should be:
8188l €ngine:
27O - 320 kPa 12.8 - 3.3 kgl/cmr. 40 - 47 psil
818C1, 818C5 engines:
320 - 370 kPa (3.3 - 3.8 kgrf/cm,, 47 - 54 psi)
{with tho fuol pfossure regulatot vacuum hose dis-
connected and pinchsd)
FUEL PRESSURE GAUGE074t 6 - 004{1001
ADAPTER BOIT, 12 mm(9txt08-PD6-0101
Reconnect the vacuum hose to the fuel pressure
regulator.
Check that the fuel pressure rises when the vacuum
hose from the fuel pressure regulator is disconnect-
ed again.
lf the fuel pressure did not rise, replace the fuelpressure regulator.
VACUUM
FUEL PRESSURER€place.
AA
,il
I
I
Replacem6nl
@ Do not smoke while working on tucl sys-
tem. Keep open flamc away from your work area.
1. Place a shop towel under the fuel pressure regula-
tor, then relieve fuel pressure (see page 11-1'18).
2. Disconnect the vacuum hose and fuel return hose.
3. Remove the.two 6 mm retainer bolts.
NOTE:
. Replace the O-ring.
o When assembling the fuel pressure regulator,
apply clean engine oil to the O-ring and assem-
ble it into its proper position, taking care not to
damage the O-ring.
r1
i
i
11-121

rr*
Fuel Supply System
Fuel Filter
Replacement
Do not smoke while working on fuel system. Koop
open flame away from your work atea.
While replacing the fuel filter, be qaretul to keep a
sate distanco between battery terminals and any
tools.
The fuel filter should be replaced whenever the fuel
pressure drops below the specified value I27o - 32O kPa,
2.8 - 3.3 kgf/cm', 40 - 47 psi (B18C'1, B l8C5 enginesi 320- 370 kPa (3.3 - 3.8 kgtcm',47 - 54 psi) with the fuel
pressure regulator vacuum hose disconnected and
pinchedl aiter making sure that the tuel pump and the
fuel pressure regulator are OK.
Place a shop towel under and around the fuelfilter.
Relieve fuel pressure {see page 11-1'18}.
Support the fuel filter with a wrench, as shown,
then remove the 12 mm banjo bolt and the tuel feed
pipe lrom the fuelfilter.
Remove the fuel filter clamp and fuel filter.
lnstall the new fuel filter in the reverse order of
removal, and note these items:
. When assembling, use new washers as shown.
. Clean the tlared joint of high pressure hoses
thoroughly before reconnecting them.
\,,
9.8 N.m {1.0 kgf.m,7.2 tbf.frl
WRENCH
12 mm BANJO BOLT33 N.m 13.4 kgf.m. 25 lbl.ftl
37 N.m (3.8 kgf.m,27 lbf.ft)

'*
1i
v3
I
l
i
I
1.
Testing
!@ Do not smoke during tho t€st. Keep open
flame away from your work area.
lf you suspect a problem with the fuel pump, check that
the fuel pump actually runs; when it is ON, you will hear
some noise it you hold your ear to the fuel fill pon with
the fuel fill cap removed. The fuel pump should run for
two seconds, when ignition switch is first turned on. lf
the fuel pump does not make noise, check as followsl
Remove the rear seat (see section 20).
Remove the access panel.
Disconnect the 2P connector from the tuel pump.
CAUTION: Be sure to turn the ignition switch OFF
before disconnecting the wires,
Connect the PGM-Fl main relay 7P connector termi-
nals No. 4 and No. 5 with a jumper wire.
PGM-FI MAIN RELAY CONNECTOR {C,14:}l
2.
3.
4.
5.
FUEL PUMP
{YEL/GRNI
IGN, 1
IYEL/GRN)
JUMPER WIRE
Wire side of female terminals
Check that battery voltage is available between the
fuel unit sub-harness connector terminal No. 2 and
body ground when the ignition switch is turned ON(

).
Wire side of female terminals
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 11'125).
FUEL PUMPCoNNECTOR 1C510)
L]l
lrl-r
6l FUEL PUMP
\:/ (YEL/GRNI
4.
Replacemont
@ Do not smoke while working on tuel sys-
tem, Keep open flames away trom your work area.
'1. Remove the rear seat (see section 20) (Hatchbackl
Remove the spare tire lid and the protective cover),
2. Remove the access panel.
3. Disconnect the 2P connector trom the fuel oumD.
Remove the fuel pump mounting nuts.
Remove the fuel pump from the fueltank.
install parts in the reverse order of removal.
ACCESSPANEL
5.9 N.m(0.6 kgl.m,4.3 tbtft)
5.
Replace.

1L
i
!i
!
{
Fuel Supply System
PGM-Fl Main Relay
Description
The PGM Fl main relav actuallv contains two individual
relavs. This relav is located at the left side of the cowl.
One relay is energized whenever the ignition is on which
supplies the battery voltage to the ECM, power to the
tuel injectors, and power tor the second relay. The second
relay is energized for two seconds when the ignition is
switched on, and when the engine is running, to supply
power to the fuel pump.
PGM-FIMAIN RELAY
11-124
FUEI- PUMP
Relay Testing
NOTE: lf the engine starts and continues to run, the
PGM-Fl main relay is OK.
1. Remove the PGlvl Fl main relay.
2. Attach the battery positive terminal to the No. 2 ter-
minal and the battery negative terminal to the No. 1
terminal of the PGM-Fl main relay. Then check for
continuity between the No. 5 terminal and No. 4 ter-
minal of the PGN4-Fl main relay.
. lf there is continuity, go on to step 3.
. lf there is no continuity, replace the PGM-Fl main
relay and retest.
To lGN. 1
To GROUND
To ST. SWITCH
To ECM CONNECTORTERMINAL A16
{FLRI
To BAT @
To ECM CONNECTORftNMNALSAll and A24 (lGP)
V
To FUEL PUMP
3. Attach the battery positive terminal to the No. 5 ter-
minal and the battery negative terminal to the No. 3
terminal of the PGM-Fl main relay. Then check that
there is continuity between the No. 7 terminal and
No. 6 terminal of the PGM-Fl main relav.
. lf there is continuity, goon tostep4.
. lf thereis nocontinuity, replacethe PGM-Fl main
relay and retest.
4. Attach the batterv oositive terminal to the No. 6 ter-
minal and the battery negative terminal to the No. 1
terminal ol the PGM-Fl main relay. Then check that
there is continuity between the No. 5 terminal and
No. 4 terminal of the PGM-Fi main relav.
. lf there is continuity, the PGM-FI main relay is OK.
. lf the fuei pumpstill does not work, goto Harness
Testing on the next page.
. lf thereis nocontinuity, replacethe PGM-Fl main
relav and retest.\;

I
tr,
- Engine will not start.- Inspection of PGM-FI mainrelay and relay harne$.
Check lor an open in the ware{GND line}l1. Turn the ignition switch OFF.2. Disconnect the PGM Fl mainrelay 7P connector.3. Check for continuity betweenthe PGM'FI main relay 7P connector terminal No. 3 and bodyground,
Repair open in the wire betweenthe PGM-Fl main relay and G101.
Check for an open or shon in thewire {BAT line)rMeasure voltage between thePGM-Fl main relay 7P connectorterminal No.7 and body ground.- Fepaii open or short in thewire between the PGM-FImain rel6y and the Fl E/M 115A) tuse.- Replace th€ Fl E/M {15 A)fusein the under-hood tuse/relay
ls there battery vohage?
Check foi an open or shori in thewire (lG1 line):1. Turn the ignition switch ON (ll).
2, Measure the voltage betweenthe PGM Fl main relay 7P con-nector terminal No. 5 and bodyground,R€pair open or short in thewire betwo€n the PIGM-FI mainrelav and the No. 13 FUELPUMP ISRS UNIT) (15 Altuse.ReDlace the No. 13 FUELPUMP ISRS UNID (15 Al fusein the under-dash tuse/relayoox,
Check for an open or short in thewire {STS linel:1. Turn the ignition switch to theSTART { lll) position.NOTE:. M/T: Clutch pedal must beoepresseo.. A/T: Transmission in ld or
E position.2. Measure the voltage betweenthe PGM-FI main relay 7P con-nector terminal No. 2 and bodyground,
Troubleshooting
'l RELAY 7P CONNECTOR
GND
t .--.-l T;-l IBLK)L' 'r I" T----
lr s o rl A
+
Wire side o{ female termanals
8AT(YEL/WHT)
STS {BLU/WHTI
(cont'd)
(To page11- t 26)
11-125

F
I
Fuel Supply
PGM-Fl Main
System
Relay (cont'd)
\
lb
i
(From page 11 125)
- Reprir open or short in thewire between the PGM-FI mainrelay and the No. 31 STARTERSIGNAL {7.5 A} tuse.- RoDlace the No. 31 STARTERSIGNAL {7.5 A) fuse in theunder-dash luse/relav box,
Check for an open in the wire
{FLR line}:1. Turn the ignation switch OFF.2. Disconnect the ECM connector A (32P).
3. Check for continuity betweenthe PGM-FI main relay 7P con-nector terminal No. 1 and ECMconnector terminal A16-
Repair open in the wire betweenthe ECM (A161 and the PGM-FImein relay,ls there continuity?
Check for an open in the wires{lGPl, lGP2lines}:1. Reconnect the ECM connectorA (32P).
2. Reconnect the PGM-Fl mainrelay 7P connector.3. Turn the ignition switch ON {ll).4. Measure vo ltage betweenECM connector terminals A10and A11, and between A10and 424.
- Repaar open in lhe wir€ bet-ween the ECM 1A11, A24l andthe PGM-FI main relay.- Repldce the PGM-FI main relay.
ls there battery voltage?
Substitute a known-good ECMand recheck. It prescribed vohageis now available. roplace lhe o.ig-inalECM.
ls there 1.0 V or less?
Check the PGM-Fl main relaylsee page 11-124).
PGM.FI MAIN BELAY 7P CONNECTOR IC443I
FLR
FLR
Wire side of temale terminals
Check tor en open in the ECM:1. Turn the ignition switch OFF.2. Measure voltage betlveen ECMconnector termanals A16 andA10 when the ignition switchis first turned ON (ll) for two
IGRN/BLU}
o
1,2!t5i6
:cM CONNEi)TOR A I32P)
I23sl6a9to11
1215lor 17 18t920/22232a
25262l12329
PGl(8LKI
IGP 1
{YEL/BLK}
(
t356I
t5161t la192022
25a
IGP 2{YEL/BLKI
12 15 15 17 18 19 20 .r 22 23

1r
;
J
I
Fuel Tank
Reolacement
!!@ Do not smoke while working on fuel system. Keep open flame away from your work a.ea.
1. Relieve the fuel pressure(seepagell-118).
2. Jack up the vehicle, and support it with jackstands.
3. Remove the drain bolt, and drain the fuel into an approved container.
4. Remove the rear seat (Hatchbackt Remove the spare tire lid and the protective cover), and access panels, and discon-
nect the 2P and 3P connectors.
5. Remove the EVAP two way valve cover and fuel hose protector, and disconnect the connectors.
6. Disconnect the hoses (see page 11-105). Slide back the clamps, then twist hoses as you pull, to avoid damaging them.
7. Place a tack, or other support, under the tank.
8. Remove the strap nuts, and let the straps fall free.
9. Remove the fuel tank.
lf it sticks on the undercoat applied to its mount, carefully pry it offthe mount.
10. lnstallthe drain bolt with a new washer, then coat the drain bolt with Noxrust 1248. Allow the Noxrust to dry tor 20
minutes.
11. Installthe remaining parts in the reverse order of removal.
ACCESSPANELS
CONNECTOR
2P CONNECTOR
3P CONNECTOR
2P CONNECTOR
EASE GASKETReplace.
FUEL GAUGESENDING UNIT
BASE GASKETReplace.
FUELTANK
38 N.m13.9 kgtm,28 tbf.ftl
EVAPTWO WAYVALVECOVERFUEL TANKSTNAPS
WAS}IERReplace.
9.8 N.m{1.0 kgf.m,7.2 tbt.tll
ORAIN BOLTilg N.m(5.0 k9f.m.36 rbf.ftl
FUEL HOSEPROTECTOR{
11-127

Evaporative Emission (EVAP) Controls
,J
a
DescriDtion
The evaporative emission controls are designed to minimize the amount of luel vapor escaping to the atmosphere. Thesystem consists of the following components:
A. EvaporativeEmission lEVAPlControlCanister
An EVAP control canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from theEVAP control canister into the engine and burned.
B. Vapol Purge Control System
EVAP control canister purging is accomplished by drawing fresh air through the EVAP control canister and into a pon
on the intake manifold. The purging vacuum is controlled by the EVAP purge control solenoid valve.
C. Fuel Tank Vapor Control System
When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the varve opens anoregulates the flow of fuel vapor to the EVAP control canister.
FrcmNo. 15FUELTANKPRESSURESENSOR
EVAPTHREE WAYVALVE
EVAP CONTROLCANISTENVENT SHUT VALVE
YEL/- BLK
EVAPBYPASSSOLENOIDVALVE
LT GRN
RED/EVAPTWO WAYVALVE
FUEL TANKEVAP VALVE
FUEL TANK
EVAP PURGE CONTROL SOLENOID VALVE DUTY CON-
TROLLED AFTER STARTING ENGINE
?!l ---- 311'AiS-*(7.s Al
FromPGM.FIMAIN RELAY
VARIOUSSENSORS
----<
YEL
EVAP PURGECONTROLSOLENOID VALVE
(cont'd)
-141

lT
Emission Control System
YES
{To page 11-143}
Fu€l Tank Pressure Sensor
The scan tool indicates Diagnostic Trouble Code (DTC) P0452: A low voltage problem in the Fuel Tank Pressure
sensor.
The fuel tank pressure sensor converts tuel tank absolute pressure into electrical signals and inputs the ECM.
Evaporative Emission (EVAP) Controls (cont'dl
OUTPUTVOLTAGE(vl
4.5
0.5-7 kPel-50 mmHg,-2 in.Hgl
+7 lPe
l5o mmHg,2 in.Hgl
PRESSURE
\*
Eclrl CONNECToR o {lEPl
PTANK(wltT/BLul
vcc2IYEL/BLU}
Wire side of lemale terminals
FUEL TANKPRESSURE SENSOR
3P CONNECTOR (C792)
The MIL ha3 beon roportod on.OTC F0452 i3 storad.
Chock the vscuum lines:Check the vacuum lines otthe fueltank pressure sensor for misrout-ing, leakage, breakage and clog-ging.
Are the vacuum lines OK?
Problgm verilication:1. Do the ECM Reset Procedure.2. Remove the fuel fill cap.3. Turn the ignition switch ON lll).4. Monitor the FTP sensor volt-age with the Honda PGMTester, or measure voltagebotween body ground and' ECM connector terminal D15.Int6rmittent tailure, 3ystem i3 OKat thb tirn6. Chock lor poor con-n.clions or loo3e wire3 ot C421{locltod rbovo under-d!.h fuso/r.lay boxl, C510 lloc.ted undo.rcc.rs panoll, C?92 Ituel trnko.6sura i€nior I lnd ECM.
ls there approx.2.5 V?
Check to. an opon in wi.a {VCC2line):1. Turn the ignition switch OFF.2. Reinstall the fuel fill cap.3. Disconnect the luel tank pres'su re sensor 3P connector.4. Turnthe ignition switch ON (ll).
5. Measure voltage between thetuel tank pressure sensor 3Pconnector terminals No, 1 andNo.2.
R.pai. opcn in thg wir6 bdtwoonthc fual tank pro$ure 3enlor andtho EcM lDlo).ls there approx. 5 V?
11-142
Wire side oI temale terminals

{From page 11-142i
Chock lor a short in tho wi.oIPTANK linel:Measure voltage between the fueltank pressure sensor 3P connec-tor terminals No. 2 and No. 3.
ls there approx. 5 V?
Chock for.3hort in th6 wi.e(PTANK lincl:1. Turn the ignition switch OFF.2. Disconnect the ECM connec,tor D (16P).
3. Check lor continuity betweenthe {uel tank pr€sslrre sensor3P connector terfiinal No. 3and body ground.
Ropri. 3hon in tho wira betwaGnthe fuel t.nk prosaura san3or andECM tD15t.
Substituta s known-good ECM.nd recheck. It normel fuel tenkpressure son30r is indicatod,raplacg tho o.iginal ECM.
FUEL TANKPRESSURC SENSOR3P CONNECTOR lc792l
PTANKILT GRN}
sG2IGRN/BLKI
Wire sido of temale terminals
(cont'd)
11-143