Honda Civic Service Manual page 430

PGM-FI System
Heated Oxygen Sensor (HO2S) Heater
('99 - 00 Models except D16Y5 engine with M/T)
( F r o m p a g e 1 1 - 1 5 9 )
Substitute a known-good ECM/
PCM and recheck. lf symptom/
indication goes away, replace
the origin.l ECM/PCM.
(cont'dl
PRIMARY HO2S ISENSOR 1I 4P CONNECTOB
{c123)
SECONDANY HO2S ISENSOR 2} 4P
coNNECTOR (C125)*
-r--r ,
l r z l
- f -
1 3 4 l
lc'l
L--r-J-r
relxr p1
YELI
Y
Wire side of temale terminals
SECONDARY HO2S
(SENSOR 21 4P CONNECTOR
{c782}rr
IG1 IBLK/WHT)
N O
Wire side of female telminals
ECM/PCM CONNECTORS
Wire side of female terminals
ECM/FCM CONNECTORS
* : P 0 1 4 1
**: Dl6Y8 engine
1 1 - 1 6 0
Check for an open in the wires
{lGl* line}i
Measure voltage between the pri
mary HO2S 4P connector terminal
No. 3 (D16Y8 engine: No. 4) and
body ground.
-
Repeir open or shon in the
wire between Primary HO2S
lsensor 1), {No. 15 ALTERNA-
TOR SP SENSOR) (7.5 A) fus€
and Secondary HO2S, Sensor
2t,.
-
ReDlace the No. 15 ALTERNA-
TOR SP SENSOR {7.5 A tuse.
ls there battery voltage?
Check ,or an open in the wires
(PO2SHTC, SO2SHTC' linel:
1. Turn the ignition switch OFF.
2. Reconnect the HO2S 4P con-
nector,
3. Disconnect the ECN4/PCM con
nector C (31Pi (ECM/PCM con-
nector A (32P))i.
4. Turn the ignition switch ON (lli.
5. Measure voltage between the
ECM/PCM connector terminals
82 and Cl 182 and AB)*.
Reprir open in the wirc betwo€n
ECM/PCM (Cl, A8i) and HO2S
(Primary, Secondary+).
ls there 0.1 V or less?
(From page 11 l59i
Check tor a short in the wires
IPO2SHTC, SO2SHTC* linel:
1. Turn the ignition switch OFF.
2. Disconnect the ECM/PCM con-
nector C (31Pi (ECM/PCM con
nector A (32P)i*.
3. Check tor continuity between
the ECM/PCM connector termi
nal C1 {A8)* and body ground.
Repai. short in the wire b€tween
ECM/PCM lcl, A8.l and HO2S
(Pdmery, Secondary*1.
Substitute a known-good ECM/
PCM end recheck. lf symptom/
indication goes away, replace
the o.iginal ECM/PCM.
W i r e s i d e o f f e m a l e t e r m i n a l s