Dtc P0037 / P0038: Ho2S Heater Control Circuit Low / High (Sensor-2) - Suzuki SX4 Service Manual

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DTC P0037 / P0038: HO2S Heater Control Circuit Low / High (Sensor-2)

Wiring Diagram
GRN
3
WHT
1
11
15
14
13
12
11
30
28
27
26
29
45
44
43
42
41
59
60
58
57
56
1. Main fuse box
2. Shield wire
3. Ignition switch
DTC Detecting Condition and Trouble Area
Voltage of HO2S-2 heater is more than specified value or less than specified value for
5 seconds even through its control duty ratio is within 25 – 75%.
(2 driving cycle detection logic)
DTC Confirmation Procedure
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Run engine at idle speed for 1 min.
5) Check DTC and pending DTC.
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC Troubleshooting".
4
BLK/WHT
5
BLK
WHT
8
12
E01
10
9
8
7
6
5
4
3
25
24
23
22
21
20
19
18
40
39 38
37
36
35
34
33
55
54 53
52
51
50
49
48
4. Junction block assembly
5. "IG COIL" fuse
6. HO2S-2
DTC detecting condition
Engine General Information and Diagnosis:
6
BLK
7
2
BLU
BRN
ORN
2
1
15
14
13
12
11
17
16
30
28
27
26
29
32 31
45
44
43
42
41
59
47 46
60
58
57
56
7. Heater
8. To HO2S-1 heater
9. ECM
9
BLK/WHT
E01-29
RED/BLU
C01-47
5V
C01-11
C01-57
10
C01
10
9
8
7
6
5
4
3
25
24
23
22
21
20
19
18
40
39 38
37
36
35
34
33
55
54 53
52
51
50
49
48
10. To HO2S-1
11. Individual circuit fuse box No.1
12. "IGN" fuse
Trouble area
• HO2S-2 heater
• HO2S-2 heater circuit
• ECM
1A-61
S7RW0A1104018
2
1
17
16
32 31
47 46
I6RW0D110021-01

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