1998 HONDA INTEGRA main relay

Starter Switch Signal
This signals the ECM when the engine is cranking.
NOTEI. M/T:Clutch pedal must be depressed.. A,/T: Transmission in E or E position.
Wire sida of female terminals
Check for an opon or short in thcwi.. ISTS lin.l:Measure voltage between ECMconnector terminals C6 and Agwith the ignition switch in thostart position (lll).
Inspect the No.31 STARTER SIG-NAL (7.5 Alluse in the under-dashfuse/relay box,
ls there battery voltage?
- Repair 3hort in the wire be-tween tho ECM lc6l rnd theNo. 31 STARTER SIGNAL (7.sAl tus€ or the PGM-FI mainr€lay.- Roplace the No. 31 STARTERSIGNAL 17.5 Al fuso.
Starter switch signal b OK.
Ropair open in tho wire botwaonih6 ECM {CGl and the No, 3lSTARTER SIGNAL {7.5 Al fuse.
11-105

The fuel supply system co
high pressure fuel pump, t
fuel pressure regulator. f
damper, and fuel delivery i
delivers pressure-regulated
cuts the luel delivery when
Fuel Supply System
System Description
consists of a fuel tank, in-tank
r, PGM-Fl main relay, fueffilter,
. fuel injectors, fuel pulsation
y and return lines. This system
ed fuel to the fuel injectors and
rn thq engine is not running.
Fuel Pressure
Relieving
Before disconnecting fuel pipes or hoses, release pres-
sure from the system by loosening the 12 mm banjo
bolt on top ol the fuel filter.
Do not smok€ while working on the tuel system,
Keep open flames or sparks away from you. work
arga.
Be sure to relieve fuel pressure while the ignition
swiich is ofl,
Make sure you have the anti theft code for the
radio, then write down the frequencies for the
radio's preset buttons.
Disconnect the battery negative cable from the bat-
tery negative terminal.
Remove the fuelfill cap.
Use a box end wrench on the 12 mm banjo bolt at
the fuel filter while holding the fuel filter with another
wrench.
Place a rag or shop towel over the '12 mm banjo
bolt.
Slowly loosen the 12 mm banjo bolt one complete
tu rn.
1 1-1 18
I
NOTE| Replace the washers whenever the 12 mm banjo
bolt is loosened or removed.
lnsDection
1. Relieve fuel pressure.
2. Remove the 12 mm banjo bolt from the fuel filter
while holding the fuel tilter with another wrench.
Attach the fuel pressure adapter bolt, 12 mm and
the special tool.
3. Stan the engine. Measure the tuel pressure with the
engine idling and the vacuum hose of the fuel pres-
sure regulator disconnected from the fuel pressure
regulator and pinched. lf the engine will not start,
turn the ignition switch ON (ll), wait for two sec-
onds, turn it off, then back on again and read the
tuel pressure.
Pressuro should be:
Bl8Bl engire:
270 - 320 kP. (2.8 - 3.3 kgl/cm'.40 - 47 psi)
818C1, 818C5 engines:
320 - 370 kPa (3.3 - 3.8 kgt/cm'. 47 - g psi)
12 mm
FUEL FILTER

'*
1i
v3
I
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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
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{
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

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

Terminal NumberSignalDescriptionMaasuring Conditlons/Tarminal Voliage
424ACCLAir conditioning (Ay'C) clutch relay
control
With A,/C comDressor ON: 0 V
With Ay'C compressor OFF: Battery voltage
A25tG1Power supply systemWith ignition switch ON (ll)r 12 V
426LG1Ground
B1Not used
82BAROS SBarometric pressure sensor signal
input
With ignition switch ON (ll) and depending on
barometric pressure: Approx. 3 V
B3ECTEngine coolant temperature sen-
sor signal input
With ignition switch ON (ll) and depending on
engine coolant tem perature: Approx. 0.1 - 4.8 V
B4TPSThrottle position sensor signal
input
With ignition switch ON (ll) 8nd throttle fully
open: 4.14 - 4.82 V
With ignition switch ON (ll) and throttle fully
closed: 0.44 - 0.56 V
B5VSSVehicle speed sensor signal inputWith ignition switch ON (ll) and front wheels
rotating; Pulsing signal
B6AFSBUpshifvdownshift comparative
signal output
With engine idling: 0 V
At uDshift or downshift: 5 V for an instant
B7AFSAUpshifvdownshift com parative
srgnal output
With engine idling: 0 V
At upshift or downshift: 5 V for an instant
B8NCSGCountershaft speed sensor signal
ground
Always: 0 V
B9NCCountershaft speed sensor signal
Input
Depending on vehicle speed: Pulsing signal
When vehicle is stopped:0 V
B10NMMainshaft speed sensor signal
input
Depending on vehicle speed: Pulsing signal
When vehicle is stoDoed: 0 V
811Not used
812STOP SWBrake switch signal inputWith ignition switch ON {ll) and b.ake pedal
depressed: Battery voltage
With ignition switch ON (lll and brake pedal
released:0 V
813Not used
814scsTiming adjustment
service check signal
With ignition switch ON (ll) and service check
connector oDen:5 V
With ignition switch ON (ll) and service check
connector connected with special tool: 0 V
815Not used
816Not used
817NMSGMainshaft speed sensor signalgroundAlways: 0 V
818Not used
819FASShift acknowledge inputWith engine idling: 5 V
At upshift or downshift: 0 V for an instant
820VBEF+5 V referenceWith ignition switch ON {lll: Approx. 5 V
82'lNot used
Not used
14-49