Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 300
EN(H4DOTC)(diag)-424
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
6
CHECK LEAK CHECK VALVE ASSEMBLY.
Check the vacuum pump of the leak check
valve assembly. <Ref. to EC(STI)-21, CHECK
VACUUM PUMP, INSPECTION, Leak Check
Valve Assembly.> <Ref. to EC(w/o STI)-22,
CHECK VACUUM PUMP, INSPECTION, Leak
Check Valve Assembly.>
Is the vacuum pump of the leak
check valve assembly OK?
Repair the poor
contact in the leak
check valve
assembly connec-
tor.
Step
Check
Yes
No
EN(H4DOTC)(diag)-425
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
FD:DTC P2402 EVAPORATIVE EMISSION SYSTEM LEAK DETECTION PUMP
CONTROL CIRCUIT HIGH
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-278, DTC P2402 EVAPORATIVE EMISSION SYS-
TEM LEAK DETECTION PUMP CONTROL CIRCUIT HIGH, Diagnostic Trouble Code (DTC) Detecting Cri-
teria.>
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
B97
R1
10
B92
2 3 4 5
6 7 8 9
11 12 13 14
17 18 19 20
1
10
15 16
B97
R82
1 2
3 4 5
6 7 8 9 10 11 12
B220
B83
4
1 2 3
6
5
*
B83
*
*
D27
B22
C21
B30
B4
B135
B:
B136
C:
B137
D:
14
17
15
16
13
8
R81
R82
1
5
8
7
6
4
3
R400
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
B135
B:
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
B137
D:
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
B136
C:
1 2
4
5 6 7 8
3
R400
24
23
22
21
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B220
4
3
EN-09250
R5
B92
E
SBF-7
BATTERY
FUSE
(RELAY BLOCK)
MAIN RELAY
LEAK CHECK VALVE ASSY
VACUUM
PUMP
PRESSURE
SENSOR
SWITCHING
VALVE
: TERMINAL No. OPTIONAL ARRANGEMENT
EN(H4DOTC)(diag)-426
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK HARNESS BETWEEN ECM AND
LEAK CHECK VALVE ASSEMBLY CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the leak
check valve assembly.
3) Turn the ignition switch to ON.
4) Measure the voltage between leak check
valve assembly and chassis ground.
Connector & terminal
(R400) No. 4 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Repair the short
circuit to power in
harness between
ECM connector
and leak check
valve assembly
connector.
2
CHECK LEAK CHECK VALVE ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Check the vacuum pump of the leak check
valve assembly. <Ref. to EC(STI)-21, CHECK
VACUUM PUMP, INSPECTION, Leak Check
Valve Assembly.> <Ref. to EC(w/o STI)-22,
CHECK VACUUM PUMP, INSPECTION, Leak
Check Valve Assembly.>
Is the vacuum pump of the leak
check valve assembly OK?
Repair the poor
contact in the leak
check valve
assembly connec-
tor.
EN(H4DOTC)(diag)-427
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
FE:DTC P2404 EVAPORATIVE EMISSION SYSTEM LEAK DETECTION PUMP
SENSE CIRCUIT RANGE/PERFORMANCE
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-279, DTC P2404 EVAPORATIVE EMISSION SYS-
TEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE, Diagnostic Trouble Code
(DTC) Detecting Criteria.>
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
B97
R1
10
B92
2 3 4 5
6 7 8 9
11 12 13 14
17 18 19 20
1
10
15 16
B97
R82
1 2
3 4 5
6 7 8 9 10 11 12
B220
B83
4
1 2 3
6
5
*
B83
*
*
D27
B22
C21
B30
B4
B135
B:
B136
C:
B137
D:
14
17
15
16
13
8
R81
R82
1
5
8
7
6
4
3
R400
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
B135
B:
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
B137
D:
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
B136
C:
1 2
4
5 6 7 8
3
R400
24
23
22
21
B220
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32 35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
B220
4
3
EN-09250
R5
B92
E
SBF-7
BATTERY
FUSE
(RELAY BLOCK)
MAIN RELAY
LEAK CHECK VALVE ASSY
VACUUM
PUMP
PRESSURE
SENSOR
SWITCHING
VALVE
: TERMINAL No. OPTIONAL ARRANGEMENT
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