Dtc P0171 / P0172 / P2195 / P2196: Fuel System Too Lean / Rich / Stuck Lean / Stuck Rich - Suzuki Grand Vitara Service Manual

1A-111 Engine General Information and Diagnosis:
Step
4 HO2S-2 signal circuit check
1) Turn ON ignition switch.
2) Measure voltage between "RED" wire terminal of HO2S-
2 connector and vehicle body ground.
Is voltage 0 V?
5 HO2S-2 heater circuit check
1) Check HO2S-2 heater circuit referring to "DTC P0037 /
P0038: HO2S Heater Control Circuit Low / High
(Sensor-2): ".
Is circuit in good condition?
6 HO2S-2 check
1) Check HO2S-2 referring to "Heated Oxygen Sensor
(HO2S-2) Heater On-Vehicle Inspection: in Section 1C".
Is it in good condition?

DTC P0171 / P0172 / P2195 / P2196: Fuel System Too Lean / Rich / Stuck Lean / Stuck Rich

Wiring Diagram
BLK/WHT
*GRN
4
5
3
15 14 13 12 11
30 29 28 27 26
44
45 43 42 41
59
60 58 57 56
1. HO2S heater relay
2. Shield wire
3. Ignition switch
A/F Sensor Description
Refer to "A/F Sensor Description: ".
Action
1
BLK
PNK
BLK
8 PNK
BLK
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. A/F sensor
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Go to Step 5.
Go to Step 6.
Substitute a known-
good ECM and recheck.
6
2
11
BLU
WHT
7
10
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-2 heater
9. ECM
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Yes
"RED" wire is shorted to
other circuit.
Repair HO2S-2 circuit. If
circuit is OK, substitute
a known-good ECM and
recheck.
Replace HO2S-2.
9
5 V
C37-38
WHT
C37-37
BLK
5 V
RED/YEL
C37-35
RED/BLU
C37-34
PNK/BLU
C37-32
C37-31
BLK/YEL
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. Adjusting resistor
11. Sensor
*: For M16 engine
No
S5JB0A1104037
2 1
17 16
32 31
47 46
I5JB0A110044-02