2003 HONDA CIVIC Workshop Manual

PGM-FI System
67.
MIL Circuit Troubleshooting (cont'd)
Check for continuity between ECIM connector
terminal A20 and body ground.
ECM CONNECTOR A (31P)
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Wire side of female terminals
ls there continuity?
YES Repair shon in the wire between the ECN4
{A20) and the TP sensor, or repair short in the wire
between the ECM (A8) and the knock sensor. t
NO Update the ECM if it does not have the latest
software. or substitute a known-good ECM, then
recheck (see page l1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.t
vcc2{YEL/BLU}
11-106
68. Measure voltage between body ground and ECM
connector terminal E5.
ECM CONNECTOR E (31PI
Is there about 5 V?
YES U pdate the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good EClvl, replace the
original ECM.t
NO-Go to step 69.
Turn the ignition switch OFF.
Disconnect the fuel tank pressure (FTP) sensor 3P
connector.
Turn the ignition switch ON (ll).
69.
70.
11.
Wire side of female terminals

13.
74.
75.
72. Measure voltage between body ground and ECM
connector terminal E5.
ECM CONNECTOR E 131P}
ls there about 5 V?
YES Replace the FTP sensor.t
NO Go to step 73.
Turn the ignition switch OFF.
Disconnect ECM connector E (3'lP).
Check for continuity between ECM connector
terminal E5 and body ground.
ECM CONNECTOR E {31PI
Is there continuity?
YES Repair short in the wire between the ECM(E5) and the FTP sensor.l
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indicationgoes away with a known-good ECM, replace the
original ECM.I
Wire side of female terminals
Wire side of female terminals
76.
77.
78.
79.
80.
Turn the ignition switch OFF.
Turn the ignition switch ON (ll).
Measure voltage between ECM connector terminal
E29 and body ground.
ECM CONNECTOR E (31P)
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Wire side of female terminals
ls there about 5 V (or battery voltage)?
YES-Go to step 82.
NO Go to step 79.
Turn the ignition switch OFF.
Disconnect ECM connector E (31P).
(cont'd)
11-107

PGM-FISystem
MIL Gircuit Troubleshooting (cont'd)
81. Check for continuity between ECM connector
terminal E29 and body ground.
ECM CONNECTOR E 131P}
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14tc61,/1182A21
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scs(BRN)
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the data link
connector (DLC) and the ECM (E29).1
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECI\4,I
Turn the ignition switch OFF.
Disconnect ECM connector E (31P).
Turn the ignition switch ON (ll).
Does the MIL stay on?
YES-Repair short in the wire between the gauge
assembly and the ECM (E31 ). lf the wire is OK,
replace the gauge assembly.l
NO Update the ECM if it does not have the latest
software, 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
11-108

DLC Circuit Troubleshooting
lf the ECM does not communicate with the OBD ll scan
tool, Honda PGfM Tester, or l/M test equipment, do this
troubleshooting procedure.
1. Measure voltage between DLC terminal No. 16 and
body ground.
DATA LINK CONNECTOR {DLCI
(WHT/RED)
Terminal side of lemale terminals
ls therc battery voltage?
YES-Go to step 2.
NO-Repair open in the wire between DLC terminal
No. 16 and the No. 9 BACK UP (7.5 A) fuse in the
under-hood f use/relay box. I
Measure voltage between DLC terminals No. 4 and
No. 16.
DATA LINK CONNECTOR (DLCI
Terminal side of Jemale terminals
Is there battery voltage?
YES Go to step 3.
NO Repair open in the wire between DLC terminal
No. 4 and body ground.l
4.
5.
3. Measure voltage between DLC terminals No. 5 and
No. 16.
DATA LINK CONNECTOR {DLC)
Terminal side of female terminals
ls there battery voltage?
YES Go to step 4.
NO- Repair open in the wire between DLC terminal
No. 5 and the ECM (E3). t
Turn the ignition switch ON {ll).
Measure voltage between DLC terminals No.5 and
No.7.
DATA LINK CONNECTOR {DLCI
Terminal side of lemale terminals
ls there 8.5 V or more?
YES Go to step 10.
NO Go to step 6.
6. Turn the ignition switch OFF.
(cont'd)
11-109

PGM-FI System
DLC Circuit Troubleshooting {cont'dl
7. Disconnect EClvl connector E (31P). Make sure the
OBD llscan tool or Honda PGM Tester is
disconnected from the DLC.
8. Check for continuity between DLC terminal No. 7
and body ground.
DATA LINK CONNECTOR IDLC)
Ierminal side of female terminals
ls there continuity?
YES-Repair short to ground in the wire between
DLC terminal No. 7 and the ECM {E23). After
repairing the wire, check the DTC with the OBD ll
scan tool/Honda PGM Tester, and go to the DTC
Troubleshooting index. I
NO Go to step 9.
Check for continuity between DLC terminal No. 7
and ECM terminal E23,
ECM CONNECTOR E {31PI
Terminal side of female terminals
9.
K-LINE {LT BLU)
DATA LINK CONNECTOR
11-110
10.
1 'I.
tJ.
ls there continuity?
YES U pdate the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECI\4.I
NO Repair open in the wire between DLC terminal
No.7 and the ECM {E23). After repairing the wire,
check the DTC with the OBD ll scan tool/Honda
PG l\4 Tester, and go to the DTC Troubleshooting
Index.l
Turn the ignition switch OFF.
Disconnect ECI\4 connector E (31P). l\4ake sure the
OBD ll scan tool or Honda PGM Tester is
disconnected from the DLC.
Turn the ignition switch ON (ll).
Measure voltage between DLC terminals No. 5 and
No.7.
DATA LINK CONNECTOR {DLC}
Terminal side of female terminals
Is there 0 V?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECI\4, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO Repair short to power in the wire between the
DLC terminal No.7 and the ECM (E23). After
repairing the wire, check the DTC with the OBD ll
scan tool/Honda PGM Tester, and go to the DTC
Troubleshooting index. I
t

Injector Replacement
Relieve fuel pressure (see page 1 l-144).
Disconnect the connectors from the injectors (A), disconnect the ground cable (B), and remove the bracket (C).
(2.2 kgf.m, l6 lbf.ftl
ffi \*\
3. Disconnect the quick-connect fittings (D).
4. Removethefuel rail mountingnuts(E) fromthefuel rail (F)then removethefuel rail and injectors asan assembly.
5. Remove the injector clip (G)from the injector.
6. Remove the injector from the fuel rail.
(cont'd)
11-111
1.
2.
o

PGM-FI System
Injector Replacement (cont'd)
7. Coatthenewo-rings(A)withcleanengineoll,andinserttheinjectors(B) intothefuel rail (C).
8, lnstall the injector clip {D).
9. Coat the injector o-rings (E)with clean engine oil.
10. Installthe injectors intothefuel rail, then install the fuel rail intotheintakemanifold(G).
1 '1. Install the fuel rail mounting nuts, ground cable. and bracket.
12. Connect the connectors to the injectors.
13. Connect the quick-connect fittings.
14. Turnthe ignition switch ON (ll), butdo notoperatethe starter. Afterthefuel pump runs for about 2 seconds, the
fuel pressure in the fuel line rises. Repeat this two or three times. then check for fuel leakage.
\
11-112

A/F Sensor Replacement
Special Tools Required
O2 sensor wrench, Snap-on YA8875. SP Tools 93750 ,or equivalent, commercially availabre
1. Disconnect the A,/F sensor 4P connector (A), then
remove the A,/F sensor {B).
\I
ffi
B44 N.m
Installthe IVF sensor in the reverse order of
removal.
Secondary HO2S Replacement
Special Tools Fequired
02 sensor wrench, Snap-on YA8875, SP Tools 93750 ,or equivalent, commerciallV available
1. Disconnect the secondary HO2S 4P connector (A),
then remove the secondary H02S (B).
Installthe secondary HO2S in the reverse order of
removal.
2.
11-113