Subaru Legacy 2003 Service Manual page 2010

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
2 CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B134) No. 8 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
value at except "N" and "P" position?
3 CHECK HARNESS BETWEEN ECM AND
TRANSMISSION HARNESS CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from ECM and
transmission harness connector (T3).
3) Measure resistance of harness between
ECM connector and chassis ground.
Connector & terminal
(B134) No. 8 — Chassis ground:
Does the measured value exceed the spec-
ified value?
4 CHECK TRANSMISSION HARNESS CON-
NECTOR.
1) Disconnect connector from inhibitor switch.
2) Measure resistance of harness between
transmission harness connector and
engine ground.
Connector & terminal
(T3) No. 12 — Engine ground:
Does the measured value exceed the spec-
ified value?
5 CHECK INHIBITOR SWITCH.
Measure resistance between inhibitor switch
connector receptacle's terminals in select lever
except for "N" position.
Terminals
No. 7 — No. 12:
Does the measured value exceed the specified
value at except "N" and "P" positions?
6 CHECK SELECTOR CABLE CONNECTION.
Is there any fault in selector cable connection
to inhibitor switch?
Value
DTC indicated.
4.5 V — 5.5 V
1 MΩ
1 MΩ
1 MΩ
There is a fault.
EN(H4DOSTC)-171
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnos-
tics Trouble Code
(DTC)". <Ref. to
EN(H4DOSTC)-
62, List of Diag-
nostic Trouble
Code (DTC).>
Even if MI lights Go to step 3.
up, the circuit has
returned to a nor-
mal condition at
this time.
Go to step 4. Repair ground
short circuit in har-
ness between
ECM and trans-
mission harness
connector.
Go to step 5. Repair ground
short circuit in har-
ness between
transmission har-
ness and inhibitor
switch connector.
Go to step 6. Replace inhibitor
switch. <Ref. to
AT-49, Inhibitor
Switch.>
Repair selector Contact SUBARU
cable connection. distributor service.
<Ref. to CS-12,
NOTE:
Select Cable.>
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
No
be-
probable
multiple