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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
D: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
DTC DETECTING CONDITION:
• Immediately at fault recognition
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-12, DTC P0031 HO2S HEATER CONTROL CIRCUIT
LOW (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION:
After repairing or replacing the defective parts, perform the Clear Memory Mode <Ref. to
EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(di-
ag)-38, PROCEDURE, Inspection Mode.>.
WIRING DIAGRAM:
A/F & OXYGEN RELAY
3
4
5
1
B425
F34
RELAY HOLDER
SBF-1
1
3
1
SBF-5
2
B61
F44
FRONT OXYGEN
(A/F) SENSOR
E118
E100
B21
JOINT
CONNECTOR
3
4
B122
A:
B134
C: B136
ECM
B: B135
D: B137
B21
E100
E
E
EN(H4SO)(diag)-84
E118
B425
1
2
3
3
2
1
BATTERY
4
6 5 4
5
F44
1 2 3 4
5 6 7 8
A: B134
1
2
3
4
8
9
10 11 12 13 14 15
18
19 20
21
22
23 24
28 29
30
31
32
B:
B135
1
2
3
4
8
9
10 11 12 13 14 15
20
21 22 23
24
28
29
30
31
32
C:
B136
1
2
3
4
7
8
9
10 11 12 13 14 15
17 18
19 20
21
22
23
28
29
30
31
D: B137
1
2
3
4
8
9
10 11 12 13 14 15
18
19 20
21
22
23
26 27
28 29
B21
1
2
3 4
5
6
7 8
12
13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38
E
E
42
43
44
45
48 49 50 51 52 53 54
F34
2
1
4
3
B122
1
2
3 4
5
6
7 8
5
6
7
16
17
25
26 27
33 34
5
6
7
16
17 18 19
25
26 27
33
34 35
5
6
16
24
25
26 27
32
33 34 35
5
6
7
16
17
24
25
30
31
9
10 11
39
40
41
46 47
EN-04698
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