Subaru Legacy IV (2008 year). Service manual — part 159
EN(H4SO)(diag)-239
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CG:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-155, DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT
HIGH (MT MODEL), Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Improper idling
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06642
B12
T3
B14
T7
INHIBITOR
SWITCH
NEUTRAL
POSITION
SWITCH
STARTER MOTOR
(MAGNET)
P
R
N
D
6
9
12
11
B136
ECM
31
6
B12
B25
T7
1 2 3 4
5 6 7 8
9 10 11 12
B136
1
B25
T2
T2
B25
2
MT
AT
AT
AT
MT
MT
M
2
1
C:
C:
B122
*
*
: TERMINAL No. OPTIONAL ARRANGEMENT
*
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
B122
3 4
5 6
1 2
7 8
TO STARTER RELAY
1 2 3 4 5
7
6
9
8
EN(H4SO)(diag)-240
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever in neutral.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 31 (+) — Chassis ground (–):
Is the voltage less than 1 V?
Repair the poor
contact of ECM
connector.
Go to step 2.
2
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect connectors from the ECM and
transmission harness.
3) Measure the resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(B136) No. 31 — (T2) No. 2:
Is the resistance less than 1
:? Go to step 3.
Repair the open
circuit in harness
between ECM and
transmission har-
ness connector.
3
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure the resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(B136) No. 6 — (T2) No. 1:
Is the resistance less than 5
:? Go to step 4.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
transmission har-
ness connector
and engine ground
• Poor contact of
coupling connector
4
CHECK NEUTRAL POSITION SWITCH.
1) Place the shift lever in neutral.
2) Measure the resistance between transmis-
sion harness connector terminals.
Connector & terminal
(T2) No. 1 — No. 2:
Is the resistance less than 1
:? Repair the poor
contact of trans-
mission harness
connector.
Repair the open
circuit of transmis-
sion harness or
replace the neutral
position switch.
<Ref. to 5MT-35,
Switches and Har-
ness.>
EN(H4SO)(diag)-241
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
CH:DTC P1152 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (BANK1
SENSOR1)
DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-156, DTC P1152 O2 SENSOR CIRCUIT RANGE/PER-
FORMANCE (LOW) (BANK1 SENSOR1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4SO)(diag)-50,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4SO)(diag)-41, PROCEDURE,
Inspection Mode.>.
WIRING DIAGRAM:
EN-06835
B137
8
5
6
10 11 12 13 14 15
7
2
1
3
4
16
30
19 20
22
28 29
9
17
18
25
21
23
24
31
26 27
3
4
1
2
5
6
B327
SBF-5
E
E
E
B327
E22
6
4
5
3
2
1
6
4
1
3
B1
B9
B8
C3
C2
A5
D7
D1
D2
D3
36
52
34
35
37
B134
A:
B135
B:
B136
C:
B137
D:
B21
E2
ECM
B21
E2
50
51
3
4
E2
B21
E
E22
B138
B134
B135
A:
B:
B136
C:
D:
5
6
7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26 27
28
16 17
18 19 20 21
33 34
29
32
30 31
BATTERY
FRONT OXYGEN
(A/F) SENSOR
A/F, OXYGEN
SENSOR RELAY
B138
*
*
: TERMINAL No. OPTIONAL
ARRANGEMENT
*
3
1
6 5 4
2
5
6
7
2
1
3
4
29
10 11 12 13 14 15
25
24
16
30
9
8
17 18 19
20
28
21 22 23
32
31
26 27
33
34 35
16
10 11 12 13 14 15
25
24
30
9
8
7
17 18 19 20
28
21 22 23
29
32
31
1
2
3
4
5
6
27
26
33 34 35
3 4
5 6
1 2
7 8
B21
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34
35
42
43
36
37
38
39
48
49
50
51
52
53
54
40
41
44
45
46
47
EN(H4SO)(diag)-242
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FRONT OXYGEN (A/F) SENSOR
CONNECTOR AND COUPLING CONNEC-
TOR.
Has water entered the connec-
tor?
Completely
remove any water
inside.
Go to step 2.
2
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
front oxygen (A/F) sensor.
3) Measure the resistance of harness between
ECM and front oxygen (A/F) sensor connector.
Connector & terminal
(B135) No. 9 — (E22) No. 1:
(B135) No. 8 — (E22) No. 3:
Is the resistance less than 1
:? Go to step 3.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and front oxy-
gen (A/F) sensor
connector
• Poor contact of
coupling connector
3
CHECK POOR CONTACT.
Check for poor contact in the front oxygen (A/F)
sensor connector.
Is there poor contact in front
oxygen (A/F) sensor connec-
tor?
Repair the poor
contact of the front
oxygen (A/F) sen-
sor connector.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO)-35,
Front Oxygen (A/F)
Sensor.>
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