Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 291
EN(H4DOTC)(diag)-388
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
accelerator pedal position sensor.
3) Measure the resistance of harness between
ECM connector and accelerator pedal position
sensor connector.
Connector & terminal
(B135) No. 31 — (B315) No. 3:
(B135) No. 30 — (B315) No. 2:
Is the resistance less than 1 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM
connector
and
accelerator
pedal position sen-
sor connector
• Poor contact of
joint connector
2
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR
CONNECTOR.
1) Connect the connector to ECM.
2) Measure the resistance between accelera-
tor pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 2 — Chassis ground:
Is the resistance less than 1 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM
connector
and engine ground
• Poor contact of
ECM connector
• Poor contact of
coupling connector
3
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR
CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between accelerator
pedal position sensor connector and chassis
ground.
Connector & terminal
(B315) No. 3 (+) — Chassis ground (–):
Is the voltage 5 V or more?
Repair the short
circuit to power
supply in harness
between ECM con-
nector and accel-
erator pedal
position sensor
connector.
4
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B135) No. 22 — (B135) No. 31:
Is the resistance 1 MΩ or
more?
Repair the short
circuit to power
supply in harness
between ECM con-
nector and accel-
erator pedal
position sensor
connector.
EN(H4DOTC)(diag)-389
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
EV:DTC P2135 THROTTLE/PEDAL POSITION SENSOR/SWITCH “A”/“B” VOLT-
AGE CORRELATION
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-263, DTC P2135 THROTTLE/PEDAL POSITION
SENSOR/SWITCH “A”/“B” VOLTAGE CORRELATION, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Improper idling
• Poor driving performance
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-63,
OPERATION, Clear Memory Mode.>, and Inspection Mode <Ref. to EN(H4DOTC)(diag)-49, PROCE-
WIRING DIAGRAM:
• Engine electrical system, without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM,
• Engine electrical system, with SI-DRIVE <Ref. to WI-48, WITH SI-DRIVE, WIRING DIAGRAM, Engine
ECM
EN-08727
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
B136
C:
B134
A:
36
35
34
40
B17
B7
D3
A29
6
E2
B21
A1
8
C4
A2
8
6
4
25
*
*
B122
24
3
8
39
2
8
A2
A1
A19
A6
A3
D1
A4
3
E57
2
1
5
B134
B220
B220
31
29
32
A:
B137
B136
D:
C:
B135
B:
*
30
21
22
15A
B220
3
4
B135
B:
35
34
33
32
31
30
29
21
20
19
18
17
16
28
27
26
15
14
13
12
11
25
23
22
24
10
3
4
9
1
2
8
7
6
5
B220
18
19
6
7
4
3
5
2
1
12
11
10
9
8
40
36 39
38
37
34
33
35
32
28 31
30
29
23
22
21
20
26
25
24
27
17
16
15
14
13
B122
8
7
6
5
4
3
2
1
B21
33
32
31
30
29
28
27
26
47
46
45
44
43
42
54
53
52
51
50
49
48
41
40
39
38
37
36
35
34
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
D: B137
26
25
24
23
22
18
28
27
17
16
15
14
13
31
30
29
21
20
19
12
11
10
4
3
6
5
9
8
7
2
1
E57
6
5
4
3
2
1
35
34
33
32
7
26
25
24
23
22
18
28
27
17
16
15
14
13
31
30
29
21
20
19
12
11
10
4
3
6
5
9
8
2
1
E
E
E
SBF-7
FUSE
(RELAY BLOCK)
MAIN RELAY
ELECTRONIC THROTTLE
CONTROL RELAY
BATTERY
: TERMINAL No. OPTIONAL ARRANGEMENT
ELECTRONIC THROTTLE
CONTROL
EN(H4DOTC)(diag)-390
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
electronic throttle control.
3) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
(B134) No. 19 — Chassis ground:
(B134) No. 18 — Chassis ground:
(B134) No. 18 — (B136) No. 4:
(B134) No. 28 — Chassis ground:
Is the resistance 1 MΩ or
more?
Repair the ground
short circuit of har-
ness between
ECM connector
and electronic
throttle control
connector.
2
CHECK SHORT CIRCUIT INSIDE THE ECM.
1) Connect the connector to ECM.
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 1 MΩ or
more?
3
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness between
ECM connector and electronic throttle control
connector.
Connector & terminal
(B134) No. 18 — (E57) No. 6:
(B134) No. 28 — (E57) No. 4:
(B134) No. 29 — (E57) No. 3:
Is the resistance less than 1 Ω? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM
connector
and
electronic
throttle
control
connector
• Poor contact of
coupling connector
4
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Connect the connector to ECM.
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? Go to step
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM
connector
and engine ground
• Poor contact of
ECM connector
• Poor contact of
coupling connector
EN(H4DOTC)(diag)-391
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
5
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic
throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 (+) — Engine ground (–):
(E57) No. 4 (+) — Engine ground (–):
Is the voltage 5 V or more?
Repair the short
circuit to power in
the harness
between ECM con-
nector and elec-
tronic throttle
control connector.
6
CHECK HARNESS BETWEEN ECM AND
ELECTRONIC THROTTLE CONTROL CON-
NECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B134) No. 19 — (B134) No. 18:
(B134) No. 19 — (B134) No. 28:
Is the resistance 1 MΩ or
more?
Repair the short
circuit to power in
the harness
between ECM con-
nector and elec-
tronic throttle
control connector.
Step
Check
Yes
No
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