Dtc P0137 / P0138: O2 Sensor (Ho2S) Circuit Low Voltage / High Voltage (Sensor-2) - Suzuki Swift Sport 2004 Service & Repair Manual

1A-94 Engine General Information and Diagnosis:

DTC P0137 / P0138: O2 Sensor (HO2S) Circuit Low Voltage / High Voltage (Sensor-2)

Wiring Diagram
GRN
3
WHT
11
1
15 14 13 12 11
30 29 28 27 26
44
45 43 42 41
59
60 58 57 56
1. Main fuse box
2. Shield wire
3. Ignition switch
DTC Detecting Condition and Trouble Area
DTC P0137:
HO2S-2 voltage is lower than 0.4 V while engine is idling after driving with
high engine load (high speed) for specified time. And HO2S-2 max. voltage
minus HO2S-2 min. voltage is less than 0.1 V for 40 sec continuously.
(2 driving cycle detection logic)
DTC P0138:
HO2S-2 voltage is higher than 0.95 V while engine is idling after driving
with high engine load (high speed) for specified time. And HO2S-2 max.
voltage minus HO2S-2 min. voltage is less than 0.1 V for 40 sec
continuously.
(2 driving cycle detection logic)
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
DTC detecting condition
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
59
47 46 60 58 57 56
7. Heater
8. To HO2S-1 heater
9. 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
• HO2S-2
• HO2S-2 circuit
• Fuel system
• ECM
• Fuel shortage
• Exhaust system
• Air intake system
S7RS0B1104034
2 1
17 16
32 31
47 46
I6RS0C110007-01