Subaru Impreza 2004 Service Manual page 141

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
5 CHECK HARNESS BETWEEN EXHAUST
GAS TEMPERATURE SENSOR AND ECM
CONNECTOR.
1)Turn the ignition switch to OFF.
2)Measure the resistance of harness between
exhaust gas temperature sensor connector
and engine ground.
Connector & terminal
(B279) No. 2 — Engine ground:
BL:DTC P0558 GENERATOR CIRCUIT LOW INPUT
CAUTION:
For diagnostic procedure, refer to DTC P0559. <Ref. to EN(H4DOTC)(diag)-221, DTC P0559 GENER-
ATOR CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>.
Check
Is the resistance less than 5
Ω?
EN(H4DOTC)(diag)-220
Yes
Replace the Repair the har-
exhaust gas tem- ness and connec-
perature sensor. tor.
<Ref. to
NOTE:
FU(H4DOTC)-48,
In this case, repair
Exhaust Tempera-
the following:
ture Sensor.>
• Open circuit in
harness between
ECM and exhaust
gas temperature
sensor connector
• Poor contact in
exhaust gas tem-
perature sensor
connector
• Poor contact in
ECM connector
• Poor contact in
joint connector
No