Subaru Legacy 2003 Service Manual page 656

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 in select level "N" and "P" posi-
tions.
Connector & terminal
(B136) No. 21 (+) — Chassis ground
Is the measured value less than the speci-
fied value?
3 CHECK INPUT SIGNAL FOR ECM.
Measure voltage between ECM and chassis
ground in select level "N" and "P" positions.
Connector & terminal
(B136) No. 21 (+) — Chassis ground
Is the measured value within the specified
range?
4 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector.
5 CHECK HARNESS BETWEEN ECM AND IN-
HIBITOR SWITCH CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM and inhibi-
tor switch.
3) Measure resistance of harness between
ECM and inhibitor switch connector.
Connector & terminal
(B136) No. 21 — (T7) No. 12:
Is the measured value less than the speci-
fied value?
Value
DTC indicated.
1 V
4.5 - 5.5 V
There is poor contact.
1 Ω
EN(H4SO)-259
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnos-
tics Trouble Code
(DTC)". <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
Go to step 3. Go to step 5.
Go to step 4. Go to step 5.
Repair poor con- Contact SUBARU
tact in ECM con- distributor service.
nector.
NOTE:
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
Go to step 6. Repair harness
and connector.
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
be-
probable
multiple