Subaru Legacy 2004 Service Manual page 606

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground with select lever at "N" and "P"
range.
Connector & terminal
(B135) No. 12 (+) — Chassis ground (
3 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground with select lever at other than "N"
and "P" range.
Connector & terminal
(B135) No. 12 (+) — Chassis ground (
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.
5 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B135) No. 12 (+) — Chassis ground (
6 CHECK HARNESS BETWEEN ECM AND IN-
HIBITOR SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
inhibitor switch.
3) Measure the resistance of harness
between ECM and inhibitor switch connector.
Connector & terminal
(B135) No. 12 — (T7) No. 11:
Check
Is any other DTC displayed?
Is the voltage less than 1 V?
"
):
Is the voltage more than 10 V? Go to step 4.
"
):
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair the battery
"
):
Is the resistance less than 1
&?
EN(H4SO 2.0)(diag)-174
Yes
Inspect the DTC Go to step 2.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to EN(H4SO
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 3. Go to step 5.
Go to step 5.
Repair the poor Replace the ECM.
contact in ECM <Ref. to FU(H4SO
connector. 2.0)-34, Engine
Control Module
(ECM).>
Go to step 6.
short circuit in har-
ness between
ECM and inhibitor
switch connector.
Go to step 7. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and inhibitor
switch connector
• Poor contact in
coupling connector
• Poor contact in
inhibitor switch
connector
• Poor contact in
ECM connector
No