Subaru LEGACY 2006 Manual page 127

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 4 (+) — Chassis ground (–):
2 CHECK CURRENT DATA.
1) Turn the ignition switch to OFF.
2) Repair the battery short circuit of harness
between ECM and rear oxygen sensor con-
nector.
3) Turn the ignition switch to ON.
4) Read the data of rear oxygen (A/F) sensor
heater current using Subaru Select Monitor or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
3 CHECK POOR CONTACT.
Check poor contact of ECM connector.
Check
Is the voltage more than 8 V?
Is the current more than 7 A?
Is there poor contact in ECM
connector?
EN(H4SO)(diag)-90
Yes No
Go to step 2. Go to step 3.
Replace the ECM. END
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Repair the poor END
contact of ECM
connector.