Subaru Impreza 2003 Service Manual page 1395

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 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(H4DOTC)-32, Subaru Select Mon-
itor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
2 CHECK HARNESS BETWEEN EXHAUST
GAS TEMPERATURE SENSOR AND ECM
CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from exhaust gas
temperature sensor.
3)Turn the ignition switch to ON.
4)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(H4DOTC)-32, Subaru Select Mon-
itor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
Check
Is the temperature more than
1200°C (2192°F)?
Is the temperature less than
372°C (702°F)?
EN(H4DOTC)-219
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Repair the poor
contact.
NOTE:
In this case, repair
the following:
• Poor contact in
exhaust gas tem-
perature sensor
• Poor contact in
ECM
• Poor contact in
joint connector
Replace the Repair the ground
exhaust gas tem- short circuit in har-
perature sensor. ness between
<Ref. to exhaust gas tem-
FU(H4DOTC)-48, perature sensor
Exhaust Tempera- and ECM connec-
ture Sensor.> tor.
No