Dtc P0037 / P0038: Ho2S Heater Control Circuit Low / High (Sensor-2) - Suzuki Swift Sport 2004 Service & Repair Manual

1A-56 Engine General Information and Diagnosis:

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

Wiring Diagram
GRN
3
WHT
11
1
15 14 13 12 11
30 29 28 27 26
44
45 43 42 41
60 59 58 57 56
1. Main fuse box
2. Shield wire
3. Ignition switch
DTC Detecting Condition and Trouble Area
DTC detecting condition
HO2S-2 heater voltage is more than specified value or less than
specified value for 5 seconds continuously
(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
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
• Upon completion of inspection and repair work, perform "DTC Confirmation Procedure" and
confirm that the trouble has been corrected.
4
BLK/WHT
5
BLK
WHT
8
12
E23
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
6
BLK
7
2
BLU BRN
YEL
2 1 15 14 13 12 11
17 16 30 29 28 27 26
44
32 31 45 43 42 41
47 46 60 59 58 57 56
7. Heater
8. To HO2S-1 heater
9. ECM
• HO2S-2 heater
• HO2S-2 heater circuit
• ECM
9
BLK/WHT E23-29
RED/BLU
C37-47
5V
C37-11
C37-57
10
C37
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. "IG ACC" fuse
Trouble area
S7RS0B1104016
2 1
17 16
32 31
47 46
I6RS0C110007-01