Subaru IMPREZA GD 2007 Series Manual page 269

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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 the oil temperature sensor
signal using the Subaru Select Monitor or gen-
eral scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-32, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
2 CHECK POOR CONTACT.
Check for poor contact of the ECM and oil tem-
perature sensor connector.
3 CHECK HARNESS BETWEEN ECM AND OIL
TEMPERATURE SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and oil temperature sensor.
3) Measure the resistance of the harness
between the ECM and oil temperature sensor
connector.
Connector & terminal
(B134) No. 23 — (E120) No. 2:
(B134) No. 29 — (E120) No. 1:
4 CHECK HARNESS BETWEEN ECM AND OIL
TEMPERATURE SENSOR CONNECTOR.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 23 (+) — Chassis ground (–):
Check
Is the oil temperature less than
–40°C (–40°F)?
Is there poor contact in the
ECM or oil temperature sensor
connector?
Is the resistance less than 1 Ω? Go to step 4.
Is the voltage 5 V or more?
EN(H4SO)(diag)-160
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 the poor Go to step 3.
contact in the ECM
or the oil tempera-
ture sensor con-
nector.
Repair the open
circuit of harness
between ECM and
oil temperature
sensor connector.
Repair the short Replace the oil
circuit to power temperature sen-
supply in the har- sor. <Ref. to
ness between the FU(H4SO)-35, Oil
ECM and oil tem- Temperature Sen-
perature sensor sor.>
connector.