Subaru Legacy III (2000-2003 year). Service manual — part 501
EN(H4DOSTC)-174
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AO:DTC P0852 — NEUTRAL SWITCH INPUT CIRCUIT HIGH (AT 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(H4DOSTC)-35,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, OPERATION, In-
spection Mode.> .
• WIRING DIAGRAM:
EN-01003
12
INHIBITOR SWITCH
7
P
R
N
D
3
2
1
12
11
T7
T3
B12
B14
B12
T7
1 2 3 4 5 6
7 8 9 10 11 12
8
B134
ECM
STARTER MOTOR
1 2 3 4
5 6 7 8
9 10 11 12
B134
1 2 3 4
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
EN(H4DOSTC)-175
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
DTC indicated.
Inspect the rele-
vant DTC using
“List of Diagnos-
tics Trouble Code
(DTC)”. <Ref. to
EN(H4DOSTC)-
62, List of Diag-
nostic Trouble
Code (DTC).>
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
(B134) No. 8 (+) — Chassis ground
Is the measured value less than the speci-
fied value?
1 V
3
CHECK INPUT SIGNAL FOR ECM.
Measure voltage between ECM and chassis
ground in select level “N” and “P” positions.
Connector & terminal
(B134) No. 8 (+) — Chassis ground
Is the measured value within the specified
range?
4.5 - 5.5 V
4
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.
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
(B134) No. 8 — (T7) No. 12:
Is the measured value less than the speci-
fied value?
1
Ω
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
EN(H4DOSTC)-176
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. 7 — 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(H4DOSTC)-177
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
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