2003 HONDA CIVIC ECT sensor

PGM-FI System
MIL Circuit Troubleshooting (cont'dl
51. Measure voltage between body ground and ECM
connector terminals 44, A5, 423, and 424
individuallv.
ECM CONNECTOR A 131P)
PG2 (BLK) PG1 IBLKI
Wire side of female terminals
ls there morc than 1.0 V ?
YES Go to step 52.
NO-Repair open in the wire(s) that had more than
1.0 V between G 10'l and the ECM (A4, A5, A23,
A24l.a
Measure voltage between body ground and ECM
connector terminal 421.
ECM CONNECTOR A 131P)
Wire side of female terminals
ls there about 5 V?
YES-Go to step 60.
NO-Go to step 53.
11-104
53.
54.
Turn the ignition switch OFF.
Disconnect the manifold absolute pressure (MAP)
sensor 3P connector.
Turn the ignition switch ON (ll).
Measure voltage between body ground and ECM
connector terminal A21.
ECM CONNECTOR A {31P)
Wire side of female terminals
ls there about 5 V?
YES Replace the MAP sensor.l
NO Go to step 57.
Turn the ignition switch OFF.
Disconnect ECM connector A (31P).
55.
56.
\
57.
58.

59. Check for continuitv between ECIM connector
terminal 421 and body ground.
ECM CONNECTOR A {3,IPI
Wire side of female terminals
ls there continuity?
YES*Repair short in the wire between the ECM(421) and the MAP sensor.l
NO Update the ECM it it does not have the latest
soflware, or substitute a known-good ECM, then
recheck (see page 1'l-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
Measure voltage between body ground and ECM
connector terminal 420.
ECM CONNECTOR A {3TP}
60.
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101111256/ 11892t212'231?4?qTln29
vcc2IYEL/BLU)
Wire side ot female terminals
ls there about 5 V?
YES-Go to step 68.
NO-Go to step 61.
t t,
oz,
63.
64.
Turn the ignition switch OFF.
Disconnect the throttle position (TP) sensor 3P
connector.
Turn the ignition switch ON (ll).
Measure voltage between body ground and ECM
connector terminal 420,
ECM CONNECTOR A 131P)
Wire side of female terminals
ls there about 5 V?
YES Replace the thronle body (the TP sensor is
not available separately). I
NO Go to step 65.
Turn the ignition switch oFF.
Disconnect ECM connector A (31P).
65.
66.
conl o
11-105

PGM-FI System
67.
MIL Circuit Troubleshooting (cont'd)
Check for continuity between ECIM connector
terminal A20 and body ground.
ECM CONNECTOR A (31P)
rl2l3145ot/9
10t1121,/ 1,/1516ta,92A21
22 '3241 12526n
o
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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,/1,/1141562A212223241 l,/2930
scstBRN)
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

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

PGM-Fl System
ECT Sensor Replacement
'1. Remove the air cleaner {see page 11-162).
2. Disconnect the ECT sensor 2P connector.
3. Remove the ECT sensor (A).
{1.2 kgt m.8.7 lbt.ft}
reverse order of removallnstallthe sensor in the
with a new o-ring {B).
11-114
CMP Sensor B (TDC Sensorl
't.
2.
Replacement
Remove the air cleaner (see page 11-162).
Disconnect the CN4P sensor B (TDC sensor) 3P
conneclor.
Remove the CMP sensor B (TDC sensor) (A).
----
r, ".- ,',',., *nr...8.7 tbf.ftl
lnstallthe sensor in the reverse order of removal
with a new o-ring {B).
4.

IAT Sensor Replacement
1, Dlsconnect the IAT sensor 2P connector.
2. Remove the clip (A) and the IAT sensor (B).
3. lnstallthe sensor in the reverse order of removal.
Knock Sensor Replacement
1. Remove the intake manifold bracket (A).
2.
3.
4.
24Nm(2.4 kgt.m, 17 lbt.ftl
Disconnect the knock sensor 1P connector.
Remove the knock sensor (B).
Installthe sensor in the reverse order of removal.
11-115

PGM-FI System
GKP Sensor Replacement
1. Disconnect the CKP sensor 3P connector.
2. Remove the CKP sensor {A).
12 N.m (1.2 kgt m.8.7 tbf.ftl
3. lnstall the sensor in the reverse order of removal
with a new o-ring (B).
11-116