Honda Civic Service Manual page 417

Check the ECM input vottage {lP-/
VS- lino):
1. Turn the ignition switch OFF.
2 Turn the ignition switch ON (ll)
3 . M e a s u r e v o l t a g e b e t w e e n
ECM connector terminals C24
Ch.ck the ECM:
1. Turn the ignition switch OFF
2. Disconndct ECM connector C
{31P){rom the ECM.
3. Check lor continuity between
b o d y g r o u n d a n d E C M c o n
nector terminal C24
ls there more than 0.5 V?
-
Repair open in the wire
betw€en ECM {C2{l and Pri-
ma.y HO2S {S€nsor 1 l.
- Substitute a known-good ECM
and recheck. It symptom/indi
cation goes away. replace the
odginal ECM.
Check to. r short in the wi.e {lP-/
VS- lin6l:
1. Disconnect the 8P connector
from the Primary HO2S lsen-
s o r 1 ) .
2. Check tor continuity between
body ground and ECM connec-
tor terminal C24
Ropair short in the wire bstween
the Primary HO2S lsensor 1) and
ECM (C24).
Check the ECM output voltage
{VS+ linel:
N4easure voltage between ECM
connectorterminals
C25 and D11.
Check for a short in the wire (VS+
line):
1. Turn the ignition switch OFF.
2. Disconnect ECM connector C
{31P) Irom the ECM.
3. Check {or continuity between
b o d y g r o u n d a n d E C M c o n
nector terminal C25.
ls there mote than 0.5 V?
ECM CONNECTORS
l F r o m p a g e ' 1 1 - 1 4 6 )
c (31Pl
D {15P)
tP-/vs- tREol
female termrnals
sG2
(GRN/BLKI
(cont'd)
1 1- 14 7
I
2
3
a
6
8 9 1 0
1 1
12 1 3 l a
1 5
t 6
'17 1 6
22
23
2a
25
27
2a 29 30
O\ rP-/vs-
:Z taeot
,l
2
3 a 5
5 I
9 1 0
1 1 1 2
13 1 a 1 5 1 6 1 7
t 8
22
23
21
25
21 2A
E 30
0) {REDr
2 3
a
5
1 8 9
1 0
l 1
1 2 1 3
t a
'15
't6
1 7 1 8
22
23 21 E
27 2A
29
30
[]) vs*
I rwsrt
( T o p a g e 1 1 - 1 4 8 )
( T o p a g e 1 1 1 4 8 )