Honda CR-V 1997 Service Manual page 314

PGM·FI System
Primary Heated Oxygen Sensor IPrimary H02S) (Sensor 1) (cont'd)
'99 - 00 models'
- The MIL has been reported on.
I
- Ole P01 31 is stored.
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Problem verification:
,. 00 t he EC M/PC M Reset Pro-
ced ure.
2. Start t he en g i ne. Hold t h e
engi ne at
3,000
rpm
wit h
no
load (in Park or neutral) until
the radiator fan carnes on.
3. Check the Primary H02S
(Sensor 1) output vottage
with
the scan tool during accele ra·
tion using wide open throttle.
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Interm ittent failu .... system is OK
Does the vo ltage stay at 0.5 V
NO
at
this
tim •. Cheek for poor con-
or less?
nmlon. or loose
wi, . .
at
e111
(Primary H02S. Sensor 11 and 111:
I
YES
the ECM/PCM .
Check the fuel pressu re (see page
"-'781.
I
"
NO
Is it normal?
/ '
Repair the fu" IUpply system.
I
YES
Check for • short in the H02S:
1. Turn t he ign it ion switch OFF.
2. Disconnect the Primary H02S
(Sensor 1) 4P connector.
3. Start the engine and let it idle.
••
Check the Primarv
H02 S
(Sensor
1)
output voltage w ith
the scan tool.
I
"-
NO
Does it stav at
0.5 V
or less?
/ '
Replace t he HOZS (Sensor 11.
I
YES
PRIM ARY H02S (Sen so, , I 4P CONNECTOR (C" I I
Ch eck fo r a short in the wire
(PH02S linel:
,.
Turn the ig nition switch OFF.
2. Disconnect the ECM/PCM con-
nector C
(3 1
PI.
3. Check for continuity betwee n
t he Primary H02S (Se nsor
1)
4P con nector termina l No. 1
PHf8jj2S
IWHTI I 2
fl
3 4
and body ground.
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Repelr
snort
In the w ire between
"
YES
Is there conti nu ity?
/'
the ECM/PCM (CI61 end t he
I
NO
Primory H02S
(s.._
I I.
Wif e side of female terminals
Substit ute e known-good ECM/
PCM and recheck. If symptom/
indleation goes away, replace the
original ECM/PCM.
11-112