2003 HONDA CIVIC ect

Fuel Pump Circuit Troubleshooting
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 if you listen to the fuel fill port with the fuel
fill cap removed. The fuel pump should run for 2
seconds when the ignition switch is first turned on. lf
the fuel pump does not make noise, check as follows:
1. Turn the ignition switch OFF.
2. Remove the glove box {see page 20-63), then
remove the PGM-FI main relay 2 (A).
Turn the ignition switch ON {ll).
Measure voltage between PGM-Fl main relay 2 5P
connector lerminal No. 5 and body ground.
PGM.FI MAIN RELAY 25P CONNECTOR
IGPl(YEL/BLK}
Wire side of female terminals
ls there battery voltage?
YES-Go to step 5.
NO Repair open in the wire between the PGM'Fl
main relay 1 and the PGM-Fl main relay 2.t
3.
5. N4easure voltage between PGM-Fl main relay 2 5P
connector terminal No. 1 and body ground.
PGM.FI MAIN RELAY 25P CONNECTOR
Wire side oJ female terminals
ls there battery voltage?
YES Go to step 6.
NO Repair open in the wire between the under-
dash fuse/relay box and PGM-Fl main relay 2.1
6. Turn the ignition switch OFF.
7. Disconnect ECM connector E (31P).
8. Check for continuity between PGM-FI mainrelay2
5P connector terminal No. 3 and ECM connector
terminal E1.
PGM-FI MAIN RELAY 2 5P CONNECTOB
Wire side of female terminals
ls there continuity?
YES-Go to step 9.
NO-Repair open in the wire between the PGM Fl
main relay 2 and the ECM (E1).1
IMOFPR(GBN/YEL)
(cont'd)
11-141
Et2lFtxm
7-
z
ECM CONNECTOR E 131P}

FuelSupply System
(
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L
10.
1'].
Fuel Pump Circuit Troubleshooting (cont'dl
Reinstallthe PGM-Fl main relay 2.
Turn the ignition switch ON (ll).
Measure voltage between ECI\4/PCM connector
terminal E1 and body ground.
ECM CONNECTOB E {31P)
ls there battety voltage?
YES Go to step 12.
NO-Replace the PGM-Fl main relay 2.1
Turn the ignition switch OFF.
Reconnecl ECM connector E (31P).
Turn the ignition switch ON (ll), and measure
voltage between ECM connector terminal E1 and
body ground within the first 2 seconds after the
ignition switch was turned ON (ll).
ECM CONNECTOR E (31PI
13.
14.
Wire side of female terminals
Wire side of female terminals
11-142
t5.
to.
11.
18.
ls there battery voltage?
YES U pdate the ECM if it does not have the latest
so{1ware, or substitute a known-good ECM. then
recheck (see page 1 1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO Go to step 15.
Turn the ignition switch OFF.
Remove the rear seat cushion (see page 20-80).
Remove the access panel from the floor.
Measure voltage between fuel pump 5P connector
terminal No. 5 and body ground within the first 2
seconds after the ignition switch was turned ON (ll).
FUEL PUMP 5P CONNECTOR
wire side oI female terminals
ls there battery voltage?
YES Go to step 24.
NO-Go to step 19.
Turn the ignition switch OFF.
Remove the PGM-Fl main relay 2.
19.
20.

21. Connect PGM-Fl main relay 2 5P connector
terminals No. 1 and No. 2 with a iumDer wire.
PGM.FI MAIN RELAY 25P CONNECTOR
FUELPUMP(YEL/GRN)JUMPERWIRE
22.
23.
Wire side of {emale terminals
Turn the ignition switch ON (ll).
Measure voltage between fuel pump 5P connector
terminal No. 5 and body ground.
FUEL PUMP 5P CONNECTOR
Wire side ol female terminals
ls there battery voltage?
YES Replacethe PGM-Fl main relay2.t
NO-Repair open in the wire between the PGM-Fl
main relay 2 and the fuel pump 5P connector.l
Turn the ignition switch OFF.24.
FNI E
tri dffircr fv{YEL/BLK)
A
25. Check for continuity between fuel pump 5P
connector terminal No. 4 and body ground.
FUEL PUMP 5P CONNECTOR
Wire side of female terminals
ls there continuity?
YES Replace the fuel pump.l
NO-Repair open in the wire between the fuel
pump 5P connector and G551.1
11-143

FuelSupply System
Fuel Pressure Relieving
Before disconnecting fuel lines or hoses, relieve
pressure from the system by disconnecting the fuel
tube/quick connect fitting in the engine compartment.
1. Turn the ignition switch OFF,
2. Remove the PGM-Fl main relay 2 (A).
Startthe engine, and let it idle until it is stalls.
NOTE: The DTCS or Temporary DTCS P0301. P0302,
P0303, P0304 may come on during this procedure.
lf any DTCS are stored, ignore them.
Turn the ignition switch OFF.
Remove the fuel fill cap, and relieve fuel pressure
in the fueltank.
Remove the engine cover.
Disconnect the negative cable from the battery.
Check the fuel quick-connect fitting for dirt, and
clean it if necessary.
3.
4.
6.
7.
8.
11-144
11
10.
9. Place a rag or shop towel over the quick-connect
fitting (A).
Disconnect the quick-connect fifting (A): Hold the
connector (B) with one hand and squeeze the
retainer tabs (C) with the other hand to release
them from the locking pawls {D). Pullthe connector
off.
NOTE:. Prevent the remaining fuel in the fuel feedlineor
hose from flowing out with a rag or shop towel.. Be careful notto damage the line (E) or other
pa rts.. Do not use tools.. lf theconnectordoes not move, keepthe retainer
tabs pressed down, and alternately pull and push
the connector until it comes off easily.. Do not remove the retainer from the line; once
removed, the retainer must be replaced with a
new one.
After disconnecting the quick-connect fifting, check
it for dirt or damage (see page 1 1-149).

Fuel Pressure Test
Special Tools Required. Fuel pressure gauge 07406-0040004. Fuel pressure gauge sel 07ZAJ-S5A0100
1. Relieve the fuel pressure (see page 1'1-144).
2. Disconnect the quick-connect fitting (A). Aftach the
fuel pressure gauge set and fuel pressure gauge.
Start the engine and let it idle.
. lf the engine starts, goto step 5.. lf the engine does not start, goto step 4.
Check to see if the fuel pump is running: listen to
the fuel fill port with the fuel fill cap removed. The
fuel pump should run for 2 seconds when the
ignition switch is first turned on.
. lf the pump runs, go to step 5.. lf the pump does not run, do the fuel pump circuit
troubleshooting (see page 1 1-1 41 ).
Read the pressure gauge. The pressure should be
320-370 kpa (3.3-3.8 kgf/cm', a7-52 psi)
. lf the pressure is OK, the test is complete.. lf the pressure is out of specification, replace the
fuel pressure regulator and the fuel filter (see
page 11-152), then recheck the fuel pressure.
5.
11-145

Fuel Supply System
Fuel Line Inspection
Check the fuel system lines, hoses, and fuel filter for damage, leaks, and deterioration. Replace any damaged parts.
Make sure the connection issecure and the quick-connectfitting cover is firmly locked into place.
\
11-146

Check all clamps and retighten if necessary.
A: Do not disconnect the hose from the line at these ioints.
Setthe boltflange
Clamp in the middle.
There should be no
W.W
Clamp in the middle.
Setthis part
the fuel{ill tube,align the markson the tube andthe line.
11-147

Fuel Supply System
Fuel Line/Ouick-Connect Fittings Precaution
The fuel tube/quick-connect fittings connect the fuel rail(A)to fuel feed hose (B), the fuel feed hose (B) to the
fuel line (C), and the fueltube (D) to the fuel pump
assembly (E). When removing or installing the fuelfeed
hose, fuel pump assembly, or fuel tank, it is necessary
to disconnect or connect the quick-connect fittings.
Pay attention to the following:
. The fuel feed hose (B), fuel tube (D), and quick-
connect fittings (F) are not heat-resistanU be careful
not to damage them during welding or other heat-
generalrng proceoures.
. The fuelfeed hose (B), fueltube (D) andquick-
connect fittings (F) are not acid-proof; do not touch
them with a shop towel which was used for wiping
battery electrolyte. Replace them if they came into
contact with electrolyte or something similar.
. When connecting or disconnecting the fuel feed hose(B), fuel tube (D), and quick'connect fittings (F). be
careful not to bend or twist them excessivelv. ReDlace
them it they are damaged.
11-148
A disconnected quick-connect fitting can be
reconnected, but the retainer on the mating line cannot
be reused once it has been removed from the line.
Replace the retainer when
. replacing the fuel rail.. replacing the fuel line.. replacing the fuel pump.
. replacing the fuel filter,. replacing the fuel gauge sending unit.. it has been removed from the line.. it is damaged.
PARTI\4ANUFACTUREBRETAINER
COLOR
E NG INE
COI\4PARTMENT(FUEL FEED
HOSE; FU EL
LINE SIDE)
TOKAIGREEN
EN G INE
COIVIPARTMENT(FUEL FEED
HOSE: FUEL
RAIL SIDE)
TOKAIBLU
FUEL TANK
UNIT
SANOHWHITE
I