Honda Civic Service Manual page 432

PGM-FI System
I
a
a
Ch6ck the PO2SHTC circuit:
1. Start engine and keep engine
rpm at idle.
2. At the engine wire harness,
m e a s u r e v o l t a g e b e t w e e n
Primary HO2S (Sensor 1) 8P
connector terminal No. 1 ter
minal and body ground.
Check for an open in the wire
(PG linell
Measurc voltage between Primary
HO2S (Sensor 1) 8P connector ter-
minals No. l and No.2.
ls there morethan 5 V?
Repair opon in the wi.o bEtwoon
the HO2S.nd G101 (located at
th.rmonat housingl.
ls there more than 5 V?
Substitule a known-good ECM
.nd .echeck. lt 3ymptom/indica-
tion 906! rwry, roplace the origi-
nal ECM,
C h e c k l o r a s h o r t i n t h e w i r e
{PO2SHTC line):
1. Turn the ignition switch OFF.
2. Disconnect ECM connector A
(32P)trom the ECM.
3. Check for continuity between
E C M c o n n e c t o r t e r m i n a l 4 6
and body ground.
Ropair 3hort in tho wire betwoen
the ECM {46} and the Prim.ry
HO2S lson3or 11.
Check for an open in the wire
(PO2SHTC linel:
C h e c k f o r c o n t i n u i t y b e t w e e n
ECM connector terminal 46 and
the Primary HO2S (Sensor 1)8P
connector terminal No. 1.
Repair opsn in the wir6 botween
ECM {A6} .nd the Primary HO2S
lsonror 1).
S u b s t i t u t o a k n o w n - 9 o o d E C M
and rech6ck. lf symptom/indica-
tion goes away, replace the origi-
nal ECM.
Heated Oxygen Sensor (HO2S) Heater (Dl6Y5 engine with M/Tl (cont'd)
( F r o m p a g e 1 1 - 1 6 1 )
PRIMARY HO2S (SENSOR 1} 8P CONNECTOR {Cl45I
PO2SHTC
{BtK/WHT)
PO2SHTC
IALK/WHTI
ECM CONNECTOR
female terminals
1 1 -1 6 2
\.
!
\
A {32P}
o
6 I
9 l r o
I t
1 2
t 3
l 5 t6 1 ' t 8
t 9
a
221 23 2a
25 2'
2a
E
ito
,1
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