Honda Civic Service Manual page 423

Secondary Heated Oxygen Sensor {secondary HO2S)
(Sensor 2l
*'t : D16Y8 engine
*2:'99 - O0 m;dels except D16Y5 engine with M//T
The scan tool indicates Diagnostic Trouble Code (DTC) P0137: A low voltage
problem in the Secondary Heated
Oxygen Sensor (Secondary HO2S) (Sensor 2) circuit'
SECONDARY HO2S ls.n.ot 2)
,rP CONNECTOR (C125, C782')
Wire side oI temale terminals
(cont'd)
1 1 - 1 5 3
-
Tho MIL has been reported on
-
DTC P0137 is stored.
Problem verification:
1. Do the ECM/PCM Reset Pro
cedure.
2 . S t a r t t h e e n g i n e . H o l d t h e
engine at 3,000 rpm wlth no
load (in Park or neutral) until
the radiator fan comes on
3. With the scan tool, check the
S e c o n d a r y H O 2 S ( S e n s o r 2 )
output voltage at 3,000 rPm
lntermittent frilure, sYdem is OK
at this tim6. Check for Poor con'
nections or loolo wir.3 at C131t
(locatod undor right.ido of desh)'
C432. {located under middle of
dashl, cl25 lc782lr {Secondary
HO2S) tsensor 2l .nd ECM/PCM.
Does the voltage staY at 0.3 V
or less?
Ch6ck tot a sho.t in the S€condery
HO23:
'1. Turn the ignition switch OFF.
2 , D i s c o n n e c t t h e S e c o n d a r Y
HO2S lSensor 2)4P connector.
3. Start the engine.
4 . C h e c k t h e S e c o n d a r Y H O 2 S
lsensor 2) output with the scan
tool,
C h e c k t o r a s h o r t i n t h e w i r e
{SHO2S linel:
1. Turn the ignition switch OFF.
2 . D i s c o n n e c t t h o E c M / P C M
connector D {16P) {A (32P))*'
3. Check for continuity between
the SecondarY H02S (Sensor
2) 4P connector terminal No 1
and body ground.
R€pair short in tho wire bstwoen
E C M / P C M l D 1 4 ( A 2 3 1 * ' | a n d
Secondarv HOzS (Sensor 2).
Substitute a known-good ECM/
PCM and recheck lf 3ymptom/
indicalion go€s awaY, tePltco
the oiigin.l ECM/PCM.