Subaru Legacy III (2000-2003 year). Service manual — part 162
EN(H4SO)-260
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
6
CHECK INHIBITOR SWITCH GROUND LINE.
Measure resistance of harness between inhibi-
tor switch connector and engine ground.
Connector & terminal
(T7) No. 12 — Engine ground:
Is the measured value less than the specified
value?
5
Ω
Repair open circuit
in harness
between inhibitor
switch connector
and starter motor
ground line.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
inhibitor switch
connector and
starter motor
grond line
• Poor contact in
satrter motor con-
nector
• Poor contact in
starter motor
ground
• Starter motor
7
CHECK INHIBITOR SWITCH.
Measure resistance between inhibitor switch
connector receptacle’s terminals in select level
“N” and “P” positions.
Terminal
No. 7 — No. 12:
Is the measured value less than the specified
value?
1
Ω
Replace inhibitor
switch. <Ref. to
AT-49, Inhibitor
Switch.>
8
CHECK SELECTOR CABLE CONNECTION.
Is there any fault in selector cable connection
to inhibitor switch?
There is a fault.
Repair selector
cable connection.
<Ref. to CS-12,
Select Cable.>
Contact SUBARU
distributor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
Step
Value
Yes
No
EN(H4SO)-261
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
EN(H4SO)-262
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BO:DTC P0852 — NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL) —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:
EN-01137
2
1
21
B136
ECM
NEUTRAL
POSITION
SWITCH
B25
T2
T2
B25
B22
E3
15
B25
1 2
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B136
5 6
7
2
1
9
8
4
3
23
21 22
24
10 11 12 13 14
25 26
15 16 17
18 19 20
EN(H4SO)-263
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK INPUT SIGNAL FOR ECM.
1) Turn ignition switch to ON.
2) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 21 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value in neutral position?
5 V
2
CHECK INPUT SIGNAL FOR ECM.
Measure voltage between ECM and chassis
ground.
Connector & terminal
(B136) No. 21 (+) — Chassis ground (
−−−−
):
Is the measured value less than the specified
value at except neutral position?
1 V
3
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
Contact SUBARU
distributor service.
NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
4
CHECK NEUTRAL POSITION SWITCH.
Measure resistance between transmission har-
ness connector terminals.
Connector & terminal
(T2) No. 1 — No. 2:
Is the measured value less than the specified
value at except neutral position?
1
Ω
Repair open circuit
in transmission
harness or replace
neutral position
switch.
5
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
1) Disconnect connector from ECM.
2) Measure resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(B136) No. 21 — (B25) No. 1:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between ECM and
transmission har-
ness connector.
6
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure resistance of harness between trans-
mission harness connector and engine ground.
Connector & terminal
(B25) No. 2 — Engine ground:
Is the measured value less than the specified
value?
5
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
transmission har-
ness connector
and engine
grounding terminal
• Poor contact in
coupling connector
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