Honda Civic Service Manual page 419

( F r o m p a g e 1 1 1 4 8 )
( F r o m p a g e 1 1 ' 1 4 8 )
Roplac€ th€ Primary HOzS (Sen'
sor 11.
ls there lessthan 2.8 V?
Substitute a known-good ECM
and recheck. lf symptom/indica'
tion goes awav, replace th€ odgi'
n a l E C M .
Check the ECM oulput voltage
(lP+ linel:
Measure voltage between ECM
connector terminals C23 and D11
Substitute a known-good ECM
and recheck f symptom/indica-
tion goes awaY, replace the origi_
nal ECM.
ls there more than 0.4 V?
Check the ECM:
1. Turn the ignition switch OFF.
2. Disconnect ECM connector C
( 3 1 P l f r o m t h e E C M .
3. Check for continuity between
b o d y g r o u n d a n d E C M c o n -
nector terminal C23
Check fot an oPen in tha wire
llP+ linel:
1. Turn the ignition switch OFF.
2. Disconnect the 8P connoctor
from the Primary HO2S (Sen-
s o r ' l ) .
3. Check for continuity between
the PrimarY HO2S (Sensor 1)
8P connector terminal No. 7
and ECM connector termrnal
c23.
Repair open in the wire belween
E C M { C 2 3 1 a n d P r i m a r y H O 2 S
{Sensor 11.
Substitute a known_good ECM
and r6check. lf symPlom/indica'
tion goos away, replace the odgi-
n a l E C M .
Check for a short in the wire llP+
line):
1. Disconnect the 8P connector
from the Primary HO2S {Sen'
s o r 1 ) ,
2. Check for continuity between
b o d y g r o u n d a n d E C M c o n -
nector terminal C23.
Repair short in lhe wire belween
the Primary HO2S (Sensor
'l) dnd
ECM {C23).
Replace the Primary HO2S (Sen'
s o r 1 ) .
sG2
(GRN/BLKI
Wire side of
female termanals
PRIMARY HO2S
(SENSOR 1l8P
coNNECTOR lC1a5l
l P +
( B L K )
Wire side of
female termrnals
of female
terminals
N O
(cont'd)
1
2 3 a 6
8 9 1 0
1 1
12 1 3 1 4 1 5 1 6 1 7 1 8
22
21
25
a
30
I
lP+
6) tBrK)
ECM CONNECTOR C {31P}
2 3
a 6
7 I I
10
1 1 1 2 1 3 1 l 1 5 16
1 1
1 8
,4
22
23
2a
25
A
30
A\ lP+
Ij/ IBLK)
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