Subaru Legacy (2005 year). Service manual — part 207
EN(H4SO 2.5)(diag)-113
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
O: DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A” CIRCUIT
HIGH
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• Engine stalls.
• Poor driving performance
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.>.
EN(H4SO 2.5)(diag)-114
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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-03512
B362
E57
B362
B20
B21
E57
B122
B83
B138
1 2
7 8
3
4
5
6
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
34 35
36 37 38 39 40 41
48 49
50 51 52 53 54
42 43
44 45
46 47
26 27 28 29 30 31 32 33
1 2 3 4
5 6 7 8
1
2
7
8 9
5
6
3
4
10 11 12
19 20 21
29
30 31
13 14 15 16 17
27
28
18
22 23
24 25
26
1
2
7
8 9
5
6
3
4
10 11 12
19
20 21
29 30 31
13 14 15 16 17
27
28
18
22 23
24 25
26
32 33
34 35
1
2
8 9
5
6
3
4
10 11 12
19 20 21
29 30
31
13 14 15 16
17
27
28
18
22 23 24 25 26
7
32 33 34 35
B135
B:
B136
C:
B137
D:
BATTERY
MAIN RELAY
ELECTRONIC
THROTTLE
CONTROL RELAY
ELECTRONIC
THROTTLE CONTROL
SBF-7
B135
B:
B137
B136
D:
E1
B20
B83
C:
E
E
E
D6
B35
38
39
20
19
16
15
E2
B21
4
6
1
2
3
5
D4
D5
C35
C16
B1
B4
D1
D2
D3
36
35
37
C29
C18
ECM
5
8
7
6
36
B21
E2
E
B122 : RHD
B138 : LHD
1 2 3 4 5 6
B138 : RHD
B122 : LHD
1 2 3 4
5 6 7 8
9 10 11 12
14
13
15 16
*
: TERMINAL No. RANDOM ARRANGEMENT
1
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
2
*
1
*
2
*
1
*
1
*
1
*
2
EN(H4SO 2.5)(diag)-115
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 SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main throttle sensor signal
using Subaru Select Monitor.
NOTE:
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4SO 2.5)(diag)-25, Subaru Select Mon-
itor.>
Is the voltage less than 4.63
V?
3
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
Is there poor contact in con-
nector between ECM and elec-
tronic throttle control?
Repair the poor
contact.
Temporary poor
contact occurred,
but it is normal at
present.
4
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from electronic
throttle control.
4) Measure the resistance between ECM con-
nector and electronic throttle control connector.
Connector & terminal
(B136) No. 18 — (E57) No. 6:
(B136) No. 35 — (E57) No. 3:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
5
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Connect the ECM connector.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 3 — Engine ground:
Is the resistance less than 1
Ω?
Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.5)-
37, Engine Con-
trol Module
(ECM).>
6
CHECK SENSOR OUTPUT POWER SUP-
PLY.
Measure the voltage between electronic throt-
tle control connector and engine ground.
Connector & terminal
(E57) No. 6 (+) — Engine ground (
−
):
Is the voltage less than 10 V?
Repair the battery
short circuit of har-
ness between
ECM connector
and electronic
throttle control
connector.
7
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B136) No. 18 — (B136) No. 16:
Is the resistance more than 1
M
Ω?
Repair the poor
contact in harness.
Replace the elec-
tronic throttle con-
trol.
Repair the short
circuit to sensor
power supply.
EN(H4SO 2.5)(diag)-116
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
P: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP
FUEL CONTROL
DTC DETECTING CONDITION:
Detects when malfunction occurs in 2 continuous driving cycles.
TROUBLE SYMPTOM:
Engine would not return to 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-03461
35
14
19
8
B136
ECM
1
2
E2
B21
E8
ENGINE
COOLANT
TEMPERATURE
SENSOR
E8
B21
1 2 3 4
5 6 7 8
B83
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
B136
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
35
*
: TERMINAL No. RANDOM ARRANGEMENT
B83
1 2
*
*
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