Dtc P0037 / P0038: Ho2S Heater Control Circuit Low / High (Sensor-2) - Suzuki GRAND VITARA Owner's Manual

1A-69 Engine General Information and Diagnosis:

DTC P0037 / P0038: HO2S Heater Control Circuit Low / High (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 detecting condition
P0037:
HO2S-2 circuit voltage is lower than specification for more than
specified time continuously even though control duty ratio of HO2S-2
heater is less than 75% with engine running. (Heater control duty
pulse is not detected in its monitor signal)
(2 driving cycle detection logic)
P0038:
HO2S-2 circuit voltage is higher than specification for more than
specified time continuously even though control duty ratio of HO2S-2
heater is more than 25% with engine running. (Heater control duty
pulse is not detected in its monitor signal)
(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.
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
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 heater
• HO2S-2 heater circuit
• ECM
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
S5JB0A1104016
2 1
17 16
32 31
47 46
I5JB0A110032-01