Subaru Legacy 2005 Service Manual page 1797

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT SIGNAL OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 3 (+) — 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 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(H6DO)(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 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(H6DO)(diag)-101
ENGINE (DIAGNOSTICS)
Yes
Go to step 2. Go to step 3.
Replace the ECM. Finish the diagno-
<Ref. to
sis.
FU(H6DO)-34,
Engine Control
Module (ECM).>
Repair the poor Finish the diagno-
contact in ECM sis.
connector.
No