Subaru IMPREZA GD 2007 Series Manual page 228

asieps_tobira_IM_US.book 119 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of engine coolant tempera-
ture sensor signal using Subaru Select Monitor
or general 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 EN-
GINE COOLANT TEMPERATURE SENSOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and engine coolant temperature sensor.
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 34 — Chassis ground:
Check
Is the engine coolant tempera-
ture 150°C (302°F) or higher?
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-119
ENGINE (DIAGNOSTICS)
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 Repair short cir-
engine coolant cuit of the harness
temperature sen- to ground between
sor. <Ref. to the ECM and
FU(H4SO)-22, engine coolant
Engine Coolant temperature sen-
Temperature Sen- sor.
sor.>