Subaru Legacy III (2000-2003 year). Service manual — part 502
EN(H4DOSTC)-178
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AP: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(H4DOSTC)-35,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, OPERATION,
Inspection Mode.> .
• WIRING DIAGRAM:
EN-01004
2
1
8
B134
ECM
NEUTRAL
POSITION
SWITCH
B128
T9
T9
B128
B22
E3
16
B128
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B134
3 4
1 2
1 2 3 4
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
EN(H4DOSTC)-179
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
(B134) No. 8 (+) — 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
(B134) No. 8 (+) — 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
(T9) 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
(B134) No. 8 — (B128) 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
(B128) 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
EN(H4DOSTC)-180
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
7
CHECK POOR CONTACT.
Check poor contact in transmission harness
connector.
Is there poor contact in transmission harness
connector?
There is poor contact.
Repair poor con-
tact in transmis-
sion harness
connector.
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)-181
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AQ:DTC P1110 — ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNC-
TION (LOW INPUT) —
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, Inspection
Mode.> .
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Does the Subaru Select Monitor indicate DTC
P1110?
DTC P1110 indicated.
Replace the ECM.
<Ref. to
FU(H4DOSTC)-
40, Engine Con-
trol Module.>
NOTE:
Atmospheric pres-
sure sensor is built
into ECM.
It is not necessary
to inspect DTC
P1110.
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