Subaru Legacy (2005 year). Service manual — part 226
EN(H4SO 2.5)(diag)-189
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
2. MT MODEL
DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
TROUBLE SYMPTOM:
Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
• EC, EK, EH, ER and K4 model
• KA and KS model
NOTE:
Fuel injection system for KA and KS model is the same as 2.0 L model. Refer to EN(H4SO 2.0) section.
EN-03515
B12
T7
1 2 3 4 5 6
7 8 9 10 11 12
1 2 3 4
5 6 7 8
9 10 11 12
B137
5
6
7
8
2
1
9
4
3
10
22 23
11 12 13 14 15
24 25
26
16 17
18 19 20 21
27
28 29
30 31
B25
1 2
B21
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44
45
47
46
49
48
51
50
53
52
54
1 2 3 4
5 6 7 8
B122
B138
B12
T3
T7
P
R
N
D
3
2
1
12
7
12
11
B137
9
E
E
1
B25
T2
T2
B25
2
AT
MT
E2
B21
B138
*
*
36
B122
LHD :
RHD :
INHIBITOR SWITCH
ECM
NEUTRAL
POSITION
SWITCH
*
: TERMINAL No. RANDOM ARRANGEMENT
EN(H4SO 2.5)(diag)-190
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK OPTION CODE.
Is the option code EC, EK, EH,
ER or K4?
Refer to EN(H4SO
2.0) section. <Ref.
to EN(H4SO
2.0)(diag)-64, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
Fuel injection sys-
tem for KA and KS
model is the same
as 2.0 L model.
2
CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Place the shift lever except in neutral.
3) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
−
):
Is the voltage more than 10 V? Go to step 3.
3
CHECK INPUT SIGNAL OF ECM.
1) Place the shift lever in neutral.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
−
):
Is the voltage less than 1 V?
4
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM
connector?
Repair the poor
contact in ECM
connector.
Replace the ECM.
<Ref. to FU(H4SO
2.5)-37, Engine
Control Module
(ECM).>
5
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
Ω?
Repair the open
circuit in transmis-
sion harness or
replace the neu-
tral position switch.
6
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and transmission harness con-
nector.
Connector & terminal
(B137) No. 9 — (B25) No. 2:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
between ECM and
transmission har-
ness connector.
7
CHECK HARNESS BETWEEN ECM AND
NEUTRAL POSITION SWITCH CONNEC-
TOR.
Measure the resistance of harness between
ECM and transmission harness connector.
Connector & terminal
(B25) No. 1 — Engine ground:
Is the resistance less than 5
Ω?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and trans-
mission harness
connector
• Poor contact in
coupling connector
EN(H4SO 2.5)(diag)-191
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BC:DTC P1152 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW) (BANK1
SENSOR1)
DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO 2.5)(diag)-
40, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO 2.5)(diag)-33, Inspection Mode.>.
WIRING DIAGRAM:
8
CHECK POOR CONTACT.
Check poor contact in transmission harness
connector.
Is there poor contact in trans-
mission harness connector?
Repair the poor
contact in trans-
mission harness
connector.
Replace the ECM.
<Ref. to FU(H4SO
2.5)-37, Engine
Control Module
(ECM).>
Step
Check
Yes
No
EN-03457
3
4
1
2
5
6
B327
SBF-5
E
E
B327
E24
6
4
5
3
2
1
25
33
26
3
2
6
7
52
B134
B21
E2
B21
E2
50
51
3
4
E2
B21
E
B21
1 2 3 4
12 13 14 15
5 6 7 8
16 17 18 19
9 10 11
20 21 22
23 24 25 26 27 28 29 30 31 32 33
35
34
37
36
39
38
41
40
43
42
44
45
47
46
49
48
51
50
53
52
54
E24
B134
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
ECM
BATTERY
FRONT OXYGEN
(A/F) SENSOR
OXYGEN (A/F)
SENSOR RELAY
1
3
4 5 6
2
3
4
1
6
EN(H4SO 2.5)(diag)-192
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
FRONT OXYGEN (A/F) SENSOR CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
front oxygen (A/F) sensor connector.
3) Measure the resistance of harness
between ECM and front oxygen (A/F) sensor
connector.
Connector & terminal
(B134) No. 26 — (E24) No. 1:
(B134) No. 33 — (E24) No. 3:
Is the resistance less than 1
Ω?
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit of
harness between
ECM and front
oxygen (A/F) sen-
sor connector
• Poor contact in
front oxygen (A/F)
sensor connector
• Poor contact in
ECM connector
2
CHECK POOR CONTACT.
Check poor contact in front oxygen (A/F) sen-
sor connector.
Is there poor contact in front
oxygen (A/F) sensor connec-
tor?
Repair the poor
contact in front
oxygen (A/F) sen-
sor connector.
Replace the front
oxygen (A/F) sen-
sor. <Ref. to
FU(H4SO 2.5)-35,
Front Oxygen (A/
F) Sensor.>
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