Dtc P0137 / P0138: O2 Sensor (Ho2S) Circuit Low Voltage / High Voltage (Sensor-2) - Suzuki 2006 SX4 Service Manual

1A-98 Engine General Information and Diagnosis:
Step
8 Air intake system check
1) Check air intake system for clog or leak.
Is it OK?

DTC P0137 / P0138: O2 Sensor (HO2S) Circuit Low Voltage / High Voltage (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
DTC P0137:
HO2S-2 voltage is lower than specified value 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 specified value for 40 sec.
(2 driving cycle detection logic)
DTC P0138:
HO2S-2 voltage is higher than specified value 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 specified value for 40 sec.
(2 driving cycle detection logic)
Action
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
Replace HO2S-1
referring to "Heated
Oxygen Sensor (HO2S-
1 and HO2S-2)
Removal and
Installation (If Equipped)
in Section 1C".
If DTC still exists,
substitute a known-
good ECM and recheck.
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
Yes
Repair or replace air
intake system.
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. "IG ACC" fuse
Trouble area
• HO2S-2
• HO2S-2 circuit
• Fuel system
• ECM
• Fuel shortage
• Exhaust system
• Air intake system
No
S6RW0D1104034
2 1
17 16
32 31
47 46
I6RW0D110028-01