Subaru IMPREZA GD 2007 Series Manual page 263

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of fuel temperature sensor
signal using Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-32, Subaru Select Monitor.>
2 CHECK POOR CONTACT.
Repair any poor contact between the ECM and
fuel temperature sensor connectors.
3 CHECK HARNESS BETWEEN ECM AND
FUEL TEMPERATURE SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and fuel temperature sensor.
3) Measure the resistance of the harness
between the ECM and fuel temperature sensor
connector.
Connector & terminal
(B135) No. 17 — (R58) No. 6:
(B135) No. 30 — (R58) No. 5:
4 CHECK HARNESS BETWEEN ECM AND
FUEL TEMPERATURE SENSOR CONNEC-
TOR.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 17 (+) — Chassis ground (–):
Check
Is the temperature less than –
40°C (–40°F)?
Is there poor contact in the
ECM or fuel temperature sen-
sor connectors?
Is the resistance less than 1 Ω? Go to step 4.
Is the voltage 5 V or more?
EN(H4SO)(diag)-154
Yes No
Go to step 2. Even if the malfunc-
tion indicator light
illuminates, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the fault con-
dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.
Repair any poor Go to step 3.
contact between
the ECM and fuel
temperature sen-
sor connectors.
Repair the open
circuit of the har-
ness between the
ECM and fuel tem-
perature sensor
connector.
Repair the short Replace the fuel
circuit to power in temperature sen-
the harness sor. <Ref. to
between the ECM EC(H4SO)-9, Fuel
and fuel tempera- Temperature Sen-
ture sensor con- sor.>
nector.