Dtc P0037 / P0038: Ho2S Heater Control Circuit Low / High (Sensor-2) - Suzuki Grand Vitara 2011 Manual

1A-75 Engine General Information and Diagnosis: For Petrol Engine Model
Step
10 A/F sensor heater control circuit check
1) Disconnect connector from ECM with ignition switch
turned OFF.
2) Check for proper connection of A/F sensor heater circuit
terminal to ECM connector.
3) If connection are OK, measure each wire resistance of
sensor heater control circuit at ECM connector between
ECM to A/F sensor and ECM to vehicle body ground.
Is each measured wire resistance lower than 1
11 A/F sensor heater circuit check
1) Measure insulation resistance between control terminal
of A/F sensor heater and ground terminal of A/F sensor
heater at ECM connector.
Is measured resistance infinity?

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

Wiring Diagram
BLK/WHT
*GRN
5 4
3
15 14 13 12 11
30 29 28 27 26
44
45 43 42 41
60 59 58 57 56
1. HO2S heater relay
2. Shield wire
3. Ignition switch
Action
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
Go to Step 11.
Ω
?
Substitute a known
good ECM and recheck.
6
BLK
2
BLU RED
GRN
10
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 A/F sensor heater
9. ECM
Yes
Repair or replace
defective wire circuit.
Repair or replace short
wire.
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
No
S6JB0A1114017
2 1
17 16
32 31
47 46
I5JB0A110032-01