Dtc P0137 / P0138: O2 Sensor (Ho2S) Circuit Low Voltage / High Voltage (Sensor-2) - Suzuki GRAND VITARA Owner's Manual

1A-107 Engine General Information and Diagnosis:

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

Wiring Diagram
BLK/WHT
*GRN
4
5
3
15 14 13 12 11
30 29 28 27 26
45 44 43 42 41
60 59 58 57 56
1. HO2S heater relay
2. Shield wire
3. Ignition switch
DTC Detecting Condition and Trouble Area
DTC P0137:
HO2S-2 voltage is lower than 0.4 V for more than specified time
continuously while vehicle is driving with high engine load (high speed).
And HO2S-2 max. voltage minus HO2S-2 min. voltage is less than 0.2 V
for specified time continuously.
(2 driving cycle detection logic)
DTC P0138:
HO2S-2 voltage is higher than 0.85 V for more than specified time
continuously while vehicle is driving with high engine load (high speed).
And HO2S-2 max. voltage minus HO2S-2 min. voltage is less than 0.2 V
for specified time continuously.
(2 driving cycle detection logic)
BLK
PNK
1
BLK
8 PNK
7
WHT
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. "O2 HTR" fuse
5. "IG COIL" fuse
6. HO2S-2
DTC detecting condition
6
BLK
2
BLU RED
GRN
10
2 1 15 14 13 12 11
17 16 30 29 28 27 26
32 31 45 44 43 42 41
47 46 60 59 58 57 56
7. Heater
8. To A/F sensor heater
9. ECM
• HO2S-2
• HO2S-2 circuit
• Fuel system
• ECM
• Fuel shortage
• Exhaust system
• Air intake system
9
BLK/RED C37-47
5V
C37-11
GRY/GRN C37-57
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 other sensors
*: For M16 engine
Trouble area
S5JB0A1104035
2 1
17 16
32 31
47 46
I5JB0A110045-01