Subaru Legacy 2004 Service Manual page 514

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B134) No. 1 (+) — Chassis ground (
2 CHECK CURRENT DATA.
1) Turn the ignition switch to OFF.
2) Repair the battery short circuit in harness
between ECM and rear oxygen sensor con-
nector.
3) Turn the ignition switch to ON.
4) Read the data of rear oxygen sensor heater
current using Subaru Select Monitor.
NOTE:
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO 2.0)(diag)-25, Subaru Select Mon-
itor.>
3 CHECK POOR CONTACT.
Check poor contact in 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 2.0)(diag)-82
Yes
Go to step 2. Go to step 3.
Replace the ECM. END.
<Ref. to FU(H4SO
2.0)-34, Engine
Control Module
(ECM).>
Repair the poor END.
contact in ECM
connector.
No