Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 294
EN(H4DOTC)(diag)-400
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
EZ:DTC P219A BANK 1 AIR-FUEL RATIO IMBALANCE
DTC DETECTING CONDITION:
• Detected when 2 consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4DOTC)-271, DTC P219A BANK 1 AIR-FUEL RATIO IMBAL-
ANCE, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
• Engine stalls.
• Improper idling
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:
• Models without SI-DRIVE <Ref. to WI-32, WITHOUT SI-DRIVE, WIRING DIAGRAM, Engine Electrical
ECM
B138
6
4 5
3
2
1
E22
1
2
3
15
43
26
B21
E2
44
2
E2
B21
1 2
3 4
E22
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
2
1
B220
15A
9
10
11
12
B220
D:
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
C: B136
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
*
*
*
B138
D1
36
A4
40
34
35
B21
E2
D3
A6
A3
A:
54
52 53
50 51
48 49
46 47
45
44
42 43
40 41
38 39
36 37
34 35
33
32
31
30
29
28
27
26
25
24
23
22
21
20
11
10
9
19
18
17
16
8
7
6
5
15
14
13
12
4
3
2
1
D: B137
C: B136
A:
31
30
32
29
34
33
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
B134
B21
B134
C9
C19
C1
8
C6
C5
EN-08720
E
E
E
SBF-5
BATTERY
: TERMINAL No. OPTIONAL ARRANGEMENT
A/F, OXYGEN SENSOR
RELAY
FUSE
(RELAY BLOCK)
FRONT OXYGEN (A/F)
SENSOR