Subaru 2002 IMPREZA Service Manual page 487

p19
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK CURRENT DATA.
1)Start the engine.
2)Read the data of exhaust gas temperature
sensor signal using Subaru Select Monitor or
OBD-II general scan tool.
NOTE:
*Subaru 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-II General Scan Tool Instruction Manual.
GAS TEMPERATURE SENSOR AND ECM
CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from exhaust gas
temperature sensor.
3)Measure the voltage between exhaust gas
temperature sensor connector and engine
ground.
!
CHECK HARNESS BETWEEN EXHAUST
Connector & terminal
(8279)
No. 1 (+)
-
Engine ground (-):
I
CHECKHARNESSBETWEENEXHAUST
GAS TEMPERATURE SENSOR AND ECM
CONNECTOR.
1)Turn the ignition switch to ON.
2)Measure the voltage between exhaust gas
temperature sensor connector and engine
ground.
Connector & terminal
(8279)
No. 1 (+)
-
Engine ground (- ):
I
CHECK HARNESS BETWEEN EXHAUST
GAS TEMPERATURE SENSOR AND ECM
CONNECTOR.
Measure the voltage between exhaust gas
temperature sensor connector and engine
ground.
Connector & terminal
(8279) No. 1 (+)
-
Engine ground (-):
Check
;
the value less than 372°C
702"F)?
s the voltage more than 10 V?
s
the voltage more than 10 V?
s the voltage more than 4 V?
Yes
20 to step 2.
3epair battery
short circuit in har-
less between
ECM and exhaust
jas temperature
sensor connector.
?epair battery
;hort circuit in har-
less between
ECM and exhaust
gas temperature
;ensor connector.
30 to step 5.
No
lepair poor con-
act.
JOTE:
n this case, repair
he following:
Poor contact in
!xhaust gas tem-
)erature sensor
Poor contact in
iCM
Poor contact in
Dint connector
;o to step
3 .
30 to step 4.
lepair harness
ind connector.
4OTE:
n this case, repaii
he following:
Open circuit in
iarness between
X M and exhaust
jas temperature
;ensor connector
Poor contact in
?xhaust gas tem-
ierature sensor
:onnector
Poor contact in
X M connector
1
Poor contact in
oint connector
EN(D0HC TURBO)-263