Honda Civic Service Manual page 428

PGM-FI System
a
a
Heated Oxygen Sensor (HO2S) Heater
('96 - 98 Models,'99 - 00 D16Y5 engine with M/T) (cont'dl
PRIMARY HO2S {SENSOR 1I 4P CONNECTOR
{c1231
SECONDARY HO2S {SENSOR 2} 4P
coNNECTOR 1C125)r
r-l
--'1
l l i 2 l
f;T;t
tcl
|BLK/ &)
YELI Y
Wire side of fomale lerminals
SECONDARY HO2S
ISENSOR 2) 4P CONNECTOR
{c78ilf
IBLK/WHT)
Wire side of lemale terminals
(From page 11-157)
Wire sid€ ot temale terminals
SO2HTC(BLK/WHTI* PO2SHTC{BLK/WHTI
*: P0141
*+: Dl6Y8 engine
1 1 - 1 5 8
( F r o m p a g e 1 1 - 1 5 7 )
Check tor an op6n or 3hoft in the
wire {lGl lin6):
M e a s u r e v o l t a g e b e t w e e n t h e
HO2S 4P connector terminals No.3
(D16Y8 engine: No. 4) and body
ground.
-
Repair open or shon in the
wire between Primary HO2S
lson.or 1), {No. 15 ALTERNA-
TOR SP SENSORI (7.5 Al fuse
and Secondary HO2S, Sonsol
2t,.
-
Replace the No. 15 ALTERNA-
TOR SP SENSOR 17.5 A) tuse.
Check for an open in the wire
IPO2SHTC, SO2SHTC' linel:
1. Turn the ignition switch OFF.
2. Reconnect the HO2S 4P con-
nector.
3. Disconnect the ECM/PCM con-
nector A (32P).
4. Turn the ignition switch ON (ll).
5. Measure voltage between the
ECM,/PCM connector terminals
46 and 410 {A5 and A10)*.
Ropail opan in the wire b€twoen
ECM/PCM lA6, A5l* and HO2S
{Primary, Secondary+1.
ls there 0.1 V or less?
Substitute a known-good ECM/
PCM and recheck. ll symptom/
indication goes awry, repbce
tho origin.l ECM/PCM.
ECM/PCM CONNECTOR A I32P)
so2sHrc I
tBLK/WH0.J
pozsxtc E/
IBI-K/WHTI ^
,-----{v}-
| . = , |
I
PG1
IBLK}
3
u I JsTgT ro
l l
12
r3
t 5
t 6
I t ta r9
20
z2l 23
21
25 27
2A 2i
3o
Check tor a short in the wire
{PO2SHTC. SO2SHTC* line):
'1. Turn
the ignition switch OFF.
2. Disconnect the ECM/PCM con-
nector A (32P1.
3. Check for continuity between
the ECM/PCM connector termi-
nal 46 (A5)* and body ground.
Repair short in thg wire betwe€n
ECM/PCM lA6, A5*l .nd HO2S
(P.im.ry, Socondary*).
Substitute a known-good ECM/
PCM and recheck. It symptom/
indicetion goes away, rophce
the original ECM/PCM.