Subaru Legacy (2005 year). Service manual — part 241
EN(H4SO 2.5)(diag)-249
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
7
CHECK SENSOR POWER SUPPLY.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 5 (+) — Engine ground (
−
):
Is the voltage 4.5 — 5.5 V?
Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.5)-
37, Engine Con-
trol Module
(ECM).>
8
CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Turn the ignition switch to OFF.
2) Measure the resistance between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 — Engine ground:
(E57) No. 4 — Engine ground:
Is the resistance more than 10
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).>
9
CHECK SENSOR OUTPUT.
1) Connect all the connectors.
2) Turn the ignition switch to ON.
3) 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?
10
CHECK SENSOR OUTPUT.
Read the data of sub 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 4.73
V?
11
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and electronic throttle control.
Is there poor contact?
Repair the poor
contact.
Temporary poor
contact occurred,
but it is normal at
present.
12
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. 35 — (E57) No. 3:
(B136) No. 18 — (E57) No. 6:
(B136) No. 29 — (E57) No. 4:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
Step
Check
Yes
No
EN(H4SO 2.5)(diag)-250
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
13
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 5
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).>
14
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 5 (+) — 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.
15
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
Measure the voltage between electronic throt-
tle control connector and engine ground.
Connector & terminal
(E57) No. 6 (+) — Engine ground (
−
):
(E57) No. 4 (+) — Engine ground (
−
):
Is the voltage less than 10 V?
Repair the short
circuit of harness
between ECM
connector and
electronic throttle
control connector.
16
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the ECM connector.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B136) No. 18 — (B136) No. 16:
(B136) No. 29 — (B136) No. 16:
Is the resistance more than 1
M
Ω?
Repair the short
circuit to sensor
power supply.
17
CHECK ELECTRONIC THROTTLE CON-
TROL HARNESS.
1) Disconnect the connector from ECM.
2) Disconnect the connectors from electronic
throttle control.
3) Measure the resistance between electronic
throttle control connector terminals.
Connector & terminal
(E57) No. 6 — (E57) No. 4:
Is the resistance more than 1
M
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).>
Repair the short
circuit of harness.
Step
Check
Yes
No
EN(H4SO 2.5)(diag)-251
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CK:DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH “D” / “E”
VOLTAGE CORRELATION
DTC DETECTING CONDITION:
Immediately at fault recognition
TROUBLE SYMPTOM:
• Erroneous idling
• 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.>.
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-03468
B315
ACCELERATOR
PEDAL
POSITION
SENSOR
B138
1 2 3 4
5 6 7 8
MAIN
SUB
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
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
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
B135
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
29 30 31
32 33
34 35
B:
C:
D:
B122
B83
1 2 3 4 5 6
E
C:
ECM
B136
B137
D:
B83
B315
3
5
4
1
2
6
C15
C17
C34
C16
C28
C35
D1
D2
B21
E2
B1
B138
B122
D3
B: B135
B4
37
36
35
B138
B122
LHD
LHD
RHD
RHD
RHD
LHD
RHD
LHD
*
*
1
1
*
2
*
2
*
2
*
2
*
1
*
1
*
1
*
1
*
: TERMINAL No. RANDOM ARRANGEMENT
1
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
2
EN(H4SO 2.5)(diag)-252
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 ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main accelerator pedal
position sensor signal and sub accelerator
pedal position 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 more than 0.4 V? Go to step 3.
3
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and accelerator pedal position sensor.
Is there poor contact?
Repair the poor
contact.
4
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from accelerator
pedal position sensor.
4) Measure the resistance between ECM con-
nector and accelerator pedal position sensor
connector.
Connector & terminal
(B136) No. 17 — (B315) No. 5:
(B136) No. 15 — (B315) No. 3:
(B136) No. 28 — (B315) No. 2:
(B136) No. 16 — (B315) No. 1:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
connector.
5
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B136) No. 17 — Chassis ground:
(B136) No. 15 — Chassis ground:
(B136) No. 28 — Chassis ground:
(B136) No. 16 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the ground
short circuit of har-
ness.
6
CHECK POWER SUPPLY OF ACCELERA-
TOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
pedal position sensor connector and engine
ground.
Connector & terminal
(B315) No. 3 (+) — Engine ground (
−
):
(B315) No. 1 (+) — Engine ground (
−
):
Is the voltage 4.5 — 5.5 V?
Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4SO 2.5)-
37, Engine Con-
trol Module
(ECM).>
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