Secondary Heated Oxygen Sensor - Acura Integra 1998 Service Manual

Secondary Heated Oxygen Sensor (HO2S) {sensor 2l
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 7 : A l o w v o l t a g e p r o b l e m i n t h e S e c o n d a r y
Heated Oxygen Sensor (H02S) (Sensor 2) circuit.
(cont'd)
The MIL ha3 been reDorted on.
DTC P0137 is storod.
Problem veritication:
1. Do the ECM Reset Procedure.
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 with no
load (in Park or neutral) until
the radiator fan comes on,
3 . C h e c k t h e S e c o n d a r y H 0 2 S
(Sensor 2) output voltage at
3,000 rpm with the scan 1ool.
Inte.mittent failure, system is OK
at lhb time. Ch6ck Ior ooor con-
nections or loose wires at C451
lSeconddry HO2S {Sensor 2)l and
ECM.
Does the voltage stay at 0.3 V
or less?
Check for a short in th€ HO2S:
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 (Sensor 2) connector.
3. Start the engine.
4 . C h e c k t h e S e c o n d a r y H 0 2 S
(Sensor 2) output whh the scan
tool.
Does the voltage stay at 0.3 V
or less?
C h e c k t o r a s h o r t i n t h e w i r e
{SHO2S line):
r. I urn rne rgnt on swttch uFF,
2. Disconnect the ECM connec,
t o r D 1 1 6 P ) .
3. Check for continuity between
No. '1 terminal on the Secon-
dary HO2S {Sensor 2) connec
tor and body ground.
Ropair short in tho wira bctween
ECM (D14) and Secondrry HO2S
{Senso.2).
ls there continuity?
Substitute a known-good ECM
and recheck. It symptom/indice-
taon goes away, replace the origi-
nel ECM.
SECONDARY
HO2S (Sensor 2l CONNECTOR C451
sHo2s
IBLU/
REDI f-
--
T - l 1 2 l
t r 1 1
( O r l s r l
L
W i r e s i d e o I f e r n a l e t e r m i n a l s
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