Acura Integra 1998 Service Manual page 277

PGM-FI System
Secondary Heated Oxygen Sensor (HO2S) (Sensor 2l (cont'd)
T h e s c a n t o o l i n d i c a t e s D i a g n o s t i c T r o u b l e C o d e ( D T C ) P 0 1 3 8 : A h i g h v o l t a g e p r o b i e m i n t h e S e c o n d a r y
Heated Oxygen Sensor {HO2Si (Sensor 2) circuit.
YES
The MIL has been reported on.
DTC P0138 is stored.
Problem verification:
1 . D o t h e E C M R e s e t P r o c e d u r e
2 . S t a r t t h e e n g i n e . H o l d t h e e n g i n e
a t 3 , 0 0 0 r p m w i t h n o l o a d ( i n
P a r k o r n e u t r a l ) u n t i l t h e r a d i a '
t o r f a n c o m e s o n .
3 . C h e c k t h e s e c o n d a r y H O 2 S
( S e n s o r 2 ) o u t P U t v o l t a g e a t
3 , 0 0 0 r p m w i t h t h e s c a n t o o l .
lntermittent lailur€, svsted i3 OK
at this time. Chock tor Poor con'
nections or loo3e wires at C451
lSecondary HO2s lsensor 2ll and
ECM,
D o e s t h e v o l t a g e s t a y a t 0 . 6 V
ls there 0.6 V or more?
Check for an open in the wite
{s()2S line):
1. Turn the ignition switch OFF.
2. Connect ECM connector ter-
m i n a l s D 1 3 a n d D l 4 w i t h a
jumper wire.
3. Turn the ignition switch ON (ll).
4 . C h e c k t h e S e c o n d a r y H O 2 5
(Sensor 2) output voltage with
the scan tool,
Repair opsn in the wire b€tweon
ECM {D14 or O13} and Secondary
HO2S {Sensor2).
ls there 0,6 V or more?
Substitute a known-good ECM
end r6check. It symptom/indica-
tion goes away, rcplace the origi-
nal ECM.
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Check for an open in the HO2S:
1. TLrrn 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
H02S (Sensor 2) connector.
3. Connect the Secondary HO2S
(Sensor 2) 4P connector ter_
m i n a l s N o . 1 a n d N o . 2 w i t h a
jumper wire.
4. Turn the ignition switch ON (ll).
5 . C h e c k t h e S e c o n d a r y H O 2 5
( S e n s o r 2 ) o u t p u t v o l t a g e
with the scan tool.
SECONDAFY HO2S {Sensor 2l CONNECTOR C451
sHo2s
IBLU/REDI
sHo2s GNO
IONN/BLUI
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
ECM CONNECTOR D I16P}
sHo2s
GND
{ORN/
BLUI
sHo2s
IBLU/RED)
Wire side of female terminals
JUMPER WIRE
i
1 1 - 7 2
L