Subaru IMPREZA GD 2007 Series Manual page 267

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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 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 between ECM and
chassis ground.
Connector & terminal
(B134) No. 23 — Chassis ground:
Check
Is the oil temperature 215°C
(419°F) or more?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-158
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.
Replace the oil Repair the ground
temperature sen- short circuit of har-
sor. <Ref. to ness between
FU(H4SO)-35, Oil ECM and oil tem-
Temperature Sen- perature sensor.
sor.>