fuel pump relay HONDA INTEGRA 1994 4.G Workshop Manual

System Description
Electrical Connections
PGM.FI MAII{ RELAY
- rc2l L
IllLii |
ril.i--r {a/Tl
To BAOIATOR FAt!RETAY, CONDENSERFAI{ RELAY
To A/C SWITCH
FUEL INJ€CTORS
@
DATALIIIKco t{EcToR
fUELPUMP
A/C CLUTCH RELAY
FUSES
O BATTERY I1OO AI*
@ oPTroN t50 alr
o rG {50 A).
@ sroP. HoBN {2O Al*
@ BACK UP (7.5 Al*
@ No. 3 INTERIOR LIGHT {7.5 A)
O Ecu (EcMt (1s A)'
@) No. 24 ACG (ALTI 0Gl{15 A: 81881 sngin6,2OA:818C1 6n9ine)
@ No. 15 BAcK-uP LlcHTs llo Al
@ No. 13 REAR DEFROSTER RELAYHEATER MOTOR RELAYCOOLING FAN MOTOR RELAY I7.5 A}
O No. l8 STARTER SIGNAL 17.5 A)
*: UNDER-HOOD FUSE/RELAY BOX
11-12
A/T GEAR

PGM-FI System
System Description
ENGINE CONTROL MODULE (ECMIOUTPUTS
PGM-Fl System
The PGM-Fl system on this model is a sequential multipon fuel injection system,
Fuol Iniector Timing and Duration
The ECM contains memories tor the basic discharge durations at various engine speeds and manifold pressures. Thebasic discharge duration, after being read out from the memory, is turther modilied by signals sent from vanous sensofsto obtain the final discharge duration.
ldle Air Control
ldle Air Control Valve (lAC Vatve)
When the engine is cold, the A/C compressor is on, the transmission is in gear (A/T only) the brake pedal is depressed,the P/S load is high, or the alternalor is charging, the ECM controls current to the IAC Valve to maintain correct idle soeed.
lgnition Timing Controla The ECM contains mamories for basic ignition timing at various engine speeds and manifold pressures. lgnition timingis also adjusted for engine coolant temperature.a A Knock Control System is also used. when detonation is detected by the knock sensof. the ignition timing is retarded(B18Cl engine).
Other Control Functions
1. Starting Control
When the engine is started. the ECM provides a rich mixture by increasing fuel injector duration.2. Fuel Pump Control
a When the ignition switch is initially turned on, the ECM supplies ground to the PGM-Fl main relay that suppliescurrent to the fuel pump tor two seconds to pressurize the tuel system.a When the engine is running, the ECM supplies gfound to the PGM-Fl main relay that supplies current to the fuel pump.a When the engine is not running and the ignition is on, the ECM cuts ground to the PGM-FI main relav which cutscurrent to the fuel pump.
TDC/CKP/CYP Sensor
MAP Senso.
ECT Sensor
IAT Sensor
TP Sensor
HO2S
vss
BARO Sensor
ELD
Starter Signal
ALT FR Signal
Air Conditioning Signal
A/T Gear Position Signal
Battery Voltage {lcN. 1)
Brake Switch Signal
PSP Switch Signal
Knock Sensor'
VTEC Pressure Switchr
Fuel-lnjectors
PGM-FI Main Relay (Fuel Pump)
MIL
IAC Valve
A/C Compressor Clutch Relay
Radiator Fan Relav
Condenser Fan Relav
ALT
rcM
EVAP Purge Control Solenoid
HO2S Heater
VTEC Solenoid Valve'
IAB Control Solenoid Valve*
lFuet tnjector Timing and Duration]
I Electr..l"ldle Contr;il
Fit'e' contr; Funcrfit
l6tio; Ttntrlg c..trol
tEcM aack-,rp Functiorlsl
': 818C 1 €ngine
11-40

Fuel Supply System
System Troubleshooting Guide
NOTE: Across each row in the chart, the sub-systems that could be sources of a symptom ara tanked in tho order they
should be inspected starting with O. Find the symptom in the left column, read across to the most liksly source, then
refer to the page listed at the top of that column. lf inspection shows the system is OK, try the next most liksly system
@, etc.
PAGE
SYI\4 PTOM
FUEL
LINES
FUEL
INJECTOR
FUEL
PRESSURE
REGULATOR
FUEL
FILTER
FUEL
PUMP
PGM-FI
MAIN
RELAY
CONTAM'
INATEO
FUEI
11-9811-1021 1,106l1-toa11-109t'l'nl
ENGINE WON'T START@o@
DIFFICULT TO START
ENGINE WHEN COLD OR HOTo\4
ROUGH IDLEo@
POOR PER.
FORMANCE
MISFIRE OR
ROUGH
RUNNINGo@@
FAILS
EMtSSION@o
LOSS OF
POWER@@o
FREOUENT
STALLING
WHILE
WARMING
UPo
AFTER
WARMING
UPo
11-97

The fusl supply system consists ot a fuel tank, in-tank
high presssure fu6l pump, PGM-FI main relay, fuel filter,
tuel pressure regulatot, fuel inioctors, fusl pulsation
damper and fuol delivery and return linss. This system
delivers pressure-regulatored fu6l to the fu6l injectors and
cuts the fuel delivory wh6n the engine is not running.
Fuel Supply System
System DescriptionFuel Pressure
a Do not smok6 while working on the fuol syst6m,
Keep open flames or spalks away tlom your work
aroa.
a 8e sure to raliavo fuol p.essur6 while th6 6n9in6 is off.
NOTE: Eefore disconnecting fuel pipes or hoses, release
pressure from the system by loosening the 6 mm se.-
vice bolt on top of the fuel filter.
1 . Disconnect the battery negative cable from the bat-
tery negative terminal.
NOTE: The LS and GS-R model radio may have a
coded theft protection circuit. Be sure to get the cus-
tomer's code number betore disconnecting the
batterv,
After service, reconnect Dowe. to the radio and turn
it on. When the word "CODE" is displayed. enter
the customer's s-digit code to restore radio
ooeration.
2. Remove the fuel fill cap.
3. Use a box end wrench on the 6 mm service bolt at
the fuel tilter, while holding the special banjo bolt
with another wrench.
4. Place a rag or shop towel over the 6 mm service bolt.
5. Slowly loosen the 6 mm service bolt one complete
turn.
NOTE:
a A fuel pressu.e gauge can be attached at the 6
mm seryice bolt hole.
a Alwavs replace the washer between the service
bolt and the special banio bolt. whenever the ser-
vice bolt is loosened.
a Replace all washers whenever the bolts are
removeo.
SERVICE BOLT15 N.m(1.5 kgf.m,11 rbr.ftl
FUEL FILTER
1 1-100

[":::,::-'
Eecause of its compact impeller design, the fuel pump is installed inside the fueltank, thereby saving space
ng the fuel line system.
FUEL PUMP
FUEL FILTER
FUEL PUMP BRACKET
FUEL PUMP CROSS SECTION lsido vi6rvl
IMPELLERS
CHECK VALVEPUMP CASING
The fuel oumo consists of a DC motor, a circumference flow pump, a relief valve for ptotecting the fuel lir
a check valve for retaining residual pressure, an inlet port, and a discharge port. The fuel pump assembly
the impellers (driven by the motor), the fuel pump casing {which forms the pumping chsmber), and the fuel p
OPERATION(1 ) When the engine is started. the PGi/t-Fl main relay actuates the fuel pump, and the motor turns togeth
impellers.
Differential pressure is generated by the numerous grooves around the impellers.
(2) Fuel entering the inlet porr flows inside the motor from the pumping chambe. and is forced through th
port via the check valve.
lf tuel flow is obstructed at the discharge side of the tuel line, the relief valve will open to bypass the
inlet port and prevent excessive fuel pressure.
(3) When the engine stops, the tuel pump stops automatically. However, a check valve closes by gravity t
residual pressure in the line, helping the engine to aestan more easily.
and simplify-
N lTop vi6w)
PORT
GROOVES
fuel line systems,
embly consists of
fuel pump cover.
together with the
rgh the discha.ge
ss the fuel to the
avitv to retain the
(cont'd)
PUMP COVER
FUEL PUMP ASSEMBLY CROSS SECTION
D|SCHARGE FORT ^ . tNLEr P
IMPELLER
11-109

Fuel Supply System
Fuel Pump (cont'dl
Tc.ting
@E o" not smoko during tho tesr. Koop openflrmo away fiom your work area.
lf you susp€ct a problem with the tuel pump, check thatthe lusl pump actually runs; when it is ON, you will hearsome noise if you hold your ear to the luel lill oon withthe fuel fill cap remov6d. The fuel pumD should run fortwo seconds, when ignition switch is first turned on. llthe fuel pump does not make noiss, check as tollows;
1. Removo the rear seat (see section 2O).
-'2. Remove the access panel.
3. Disconnect the 2P connector from the fuel pump.
CAUTION: 86 lure to tum th6 ignition switch OFFbotor6 disconnoctlng th€ wilos,
4. Connect the BLK|yEL @ wire 8nd YEL/GRN @ wirewith a iumpe. wire 8t the PGM-FI main relav con-
nectot.
l.t, .--/ re -Fl. . MAll{ RELAY
BL&YELJumper
Check that battery voltage is available at the tuel
pump connector when the ignition switch is turned
ON (positive probe to the YEL/GRN wire, negativeprobe to ths BLK/WHT wire).
ACCESSPANEL
side
YEL/GRN
a lf battery voltage is available, replace the fuel
pump.
a It there is no voltage, check the tusl pump ground
and wire harness {see page I 1-1 l2).
11-110
Roplacomont
@ oo not smoks whilo worklng on fuel syr-
tem. Kaop opon llamos away from your wolk araa.
1. Remove the rear ssats {soe section 2O).
2. Remove the access oanel.
3. Disconnect the 2P connector from the fuel pump.
4. Remove the fuel pump mounting nuts.
5. Remove the fuel pump trom the luel tank.
6. Install a new washer on the banio bolt, then install
Darts in the revers€ order of removal.
6 N.mlO.6 kgl.m,.4 tbt.ftl
27 .m(2.4 kgt.m,21 tbt.ftl

PGM-Fl Main Relay
Doscription
The PGM-Fl main relav actuallv contains two individual
rerays.
This relay is located at the lett side of the cowl.
One relay is energized whenever the ignition is on which
supplies the battery voltage to the ECM, power to the
fuel injectors, and power for the second relay.
The second relay is energized for 2 seconds when the
ignition is switched on, and when the engine is running,
to supply power to the fuel pump.
PGM-FIMAIN RELAY
FUEL PUMP
Relay Testing
NOTE: lf the car stans and continues to r
Fl main relay is OK.
1. Remove the PGM-Fl main relay.
2. Attach the battery positive terminalto
minal and the battery negative termir
1 terminal of the PGM-FI main relay. T
continuity between the No. 5 terminal
minal of the PGM-FI main relay.
a lf there is continuity, go on 10 ste
a lt there is no continuity, replace the
relay and retest.
To lGN. I
To GROUND
To ST. SWITCH
To ECM {47}
Attach the battery positive terminalto
minal and the battery negative termil
3 terminal of rhe PGM-Fl main .elav. Tl
there is continuity between the No. ;
No.6 terminal of the PGM-Fl main re
a lf there is continuity, go on to st€
a lf there is no continuity, replace th€
relay and retest.
Anach the battery positive terminalto
minal and the battery negative termil
1 terminalof the PGM-Fl main relay, Tl
there is continuity between the No. :
No. 4 te.minal of the PGM-Fl main r
a It there is continuitv, the PGM-FI mi
a lf there is no continuity, replace th(
relav and retest.
No.2
run, the PGM-
nalto the No. 2 ter-
terminal to the No.
lay. Then check for
minal and No. 4 ter-
to step 3.
ce the PGM-Fl main
8Ar C)
ECM {425, 81)
J To FUEL PUMP
inalto the No. 5 ter-
terminsl to the No.
ay. Then check that
No. 7 terminal and
ain relay.
to step 4.
ce the PGM-Fl main
inal to the No. 6 ter-
terminal to the No.
ay, Then check that
No. 5 terminal and
nain relay.
-Flmain relay is OK.
ce the PGM-Fl main
(cont'd)
11-111

Connector ldentification and Wire Harness Routing
Roar wiro Harn$s (Hatchbsckl
Connector or
Torminal
Numbor of
CavitiosLocationConnecta tollotos
c501
c502
c503
c504
c505
c506
c507
c508
c509
LStt
c51 1
c512
c513
c514
c515
c516
c517
c5r 8
c519
c520
c521
c522
c523
c524
c525
c526
10'14
10
12
25
2
1
1
2
I
2
20
20
2
6
b
2
2
2
4
Behind left kick panel
Behind left kick panel
Behind dashboard lower cover
Behind dashboard lower cover
Behind dashboard lower cover
Driver's door
Center tloor
Center lloor
Left qusrter panel
Fuel tank
Fuel tsnk
Right quarter panel
Right quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
Left side corner of cargo area
L€ft side corner of cargo area
Left side corner of cargo area
Left rear corner of cargo area
Center ot cargo area bulkhead
Right rear cornor oJ cargo area
Center of cargo area bulkhsad
Right side of cargo area
Right side of cargo area
Main wire harness (C4211
Main wire harness (C422)
Under-dash fuse/relay box (C912)
Under-dash fuse/relay box (C91 5)
Dashboard wire harness (C554)
Driver's door wire harness {C6011
Driver's seat belt switch
Palking brake switch
Driver's door switch
Fuel pump
Fuel gauge sending unit
Passenger's door switch
Right rear speaket
Left rear speaker
Noise condenser
Connector C517
Connector C516
Power antenna motor
Cargo area light
Traile. lighting connector
LeJt taillight
License plate lights
Right taillight
Tailgate latch switch
Tailgate wire harness (C752)
Tailgate wire harness (C751)
G501
G502
G503
Behind left kick psnel
Left side of Jloor
Center ot cargo area bulkhead
Body ground, via rear wire
harness
Body ground, via rear wire
harness
Body ground, via rear wire
harness
23-28

Connector ldentification and Wire Harness Routing
Rear Wire HamsEs (S6danl
Connector ol
Torminal
Number ot
Caviti6sLocaiionConnocts toNotos
c501
c503
c504
c505
c506
c507
c508
c509
c510aEt t
c512
L9 IJ
c514
c515
c516
c517
c518
c519
c520
c521
c522
c523
c527
c52A
LCZY
c530
c531
c532
c533
c534
c535
c536
6
1,|
2
1
I
4
4
10
10
12
25
'I
1
a
1
2
2
20
20
2
6
4
4
6
Behind left kick panel
Behind left kick panel
Behind dashboard lower cover
Behind dashboard lower cover
Behind dashboard lowe, cover
Driver's door
Center floor
Center floor
Left B-pillar
Fuel tank
Fuel tank
Right B'pillar
Above right side of trunk
Above left side ot trunk
Left quarter panel
Left quarter panel
Left quarter panel
Left side corner of trunk
Above center of trunk
Left side corner of trunk
Left rear corner of trunk
Right rear corner of trunk
Right rear corner of trunk
Left ,ear door
Right rear door
LeJt quarter panel
LeJt side oJ rear window
Above right side of trunk
Right quarter panel
Right side of rear window
Left side ot trunk lid
Center ot trunk lid
Right side ot trunk lid
Main wire harness (C421)
Main wire harness (C422)
Under-dash tuse/relay box {C912}
Under-dash fuse/relay box (C915)
Dashboard wire harness (C554)
Driver's door wire harness (C6O l )
Driver's seat belt switch
Parking brake switch
Driver's door switch
Fuel pump
Fuel gauge sending unil
Front passenger's door switch
Right rear speaker
Left rear speaker
Noise condenser
Connector C517
Connector C516
Power antenna motor
Trunk light
Trailer lighting conneclor
Left outer taillighr
License plate lights
Right outer taillighr
Left rear door wire harness
(c651)
Right rear door wire harness
(c656)
Lett rear door switch
Rear window delogget (+ )
High mount btake light
Right rear door switch
Rear window defogger (- )
Left inner taillight
T,unk latch switch
Right inner taillight
G501
G502
G503
Behind lett kick panel
Left side of floor
Above center of trunk
Body ground, via rear wire
narness
Body ground, via rear wire
narness
Body ground, via rear wire
narness
23-30