DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGl N
E
(DIAGNOSTICS)
3epair poor con-
act in front oxygen
NF) sensor and
‘ear oxygen sen-
;or connector.
~
Step
CHECK ANY OTHER DTC ON DISPLAY.
Check rear oxyger
sensor circuit.
<Ref.
to
FU(D0HC
TURBO)-44, Rear
Oxygen Sensor.>
CHECK FRONT
(NF)
OXYGEN SENSOR DA-
TA.
1)Start the engine.
2)While observing the Subaru Select Monitor
or OBD-ll general scan tool screen, warm-up
the engine until coolant temperature is above
70°C (1 58°F).
If
the engine is already warmed-up, operate at
idle speed for at least 1 minute.
3)Read the data of front oxygen (NF) sensor
signal using Subaru Select Monitor or OBD-ll
general scan tool.
NOTE:
*Subam Select Monitor
For detailed operation procedure, refer
to the
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(D0HC TURBO)-38, Subaru Select Mon-
itor.>
*OBD-ll general scan
tool
For detailed operation procedures, refer
to
the
OBD-ll General Scan Tool Instruction Manual.
CHECK REAR OXYGEN SENSOR SIGNAL.
1)Race the engine at speeds from idling to
5,000
rpm for a total of
5
cycles.
NOTE:
To increase engine speed
to
5,000 rpm, slowly
depress accelerator pedal, taking approximate-
ly 5 seconds, and quickly release accelerator
pedal
to
decrease engine speed.
2)Operate the LED operation mode for engine.
NOTE:
*Subaru Select Monitor
For detailed operation procedure, refer
to the
“LED OPERATION MODE
FOR
ENGINE.
<Ref. to EN(D0HC TURBO)-38, Subaru
Select Monitor.>
CHECK EXHAUST SYSTEM.
Check exhaust system parts.
NOTE:
Check the following items.
*Loose installation of portions
*Damage (crack, hole etc.) of parts
*Looseness of front oxygen (NF) sensor
*Looseness and
ill
fitting of parts between front
oxygen (NF) sensor and rear oxygen sensor
.
3epair
or
replace
aulty parts.
Check
loes the Subaru Select Moni-
or or OBD-ll general scan
tool
ndicate DTC P0031, P0032,
J1131. Pi134or P1139?
Replace the front
oxygen (NF) sen-
sor. <Ref.
to
FU(D0HC
TURBO)-42, Fron
Oxygen
(NF)
Sen
sor.>
s
the value equal
to
or more
han 0.85 and equal
to
less
han 1.1
5
in idling?
loes the LED of {Rear 02
3ich Signal} blink?
s
there a fault in exhaust
sys-
em?
Yes
nspect DTC
J0031, P0032,
J1131, P1134or
J1
139 using “List
if
Diagnostic Trou-
)le Code
DTC)”.<Ref. to
!N(DOHC
rURBO)-80, List
if
Diagnostic Trou-
ile Code (DTC).>
20
to step
3.
No
Go to step
2.
Go
to step
4.
1
EN(D0HC
TURBO)-145
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