1A-111 Engine General Information and Diagnosis:
DTC P0171 / P0172 / P2195 / P2196: Fuel System Too Lean / Rich / Stuck Lean / Stuck Rich
S5JB0A1104037
Wiring Diagram
A/F Sensor Description
Refer to “A/F Sensor Description: ”.
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?
Go to Step 5.
“RED” wire is shorted to
other circuit.
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?
Go to Step 6.
Repair HO2S-2 circuit. If
circuit is OK, substitute
a known-good ECM and
recheck.
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?
Substitute a known-
good ECM and recheck.
Replace HO2S-2.
Step
Action
Yes
No
E23
C37
3
4
18
19
5
6
7
10
11
17
20
47
46
49
50
51
21
22
52
16
25
9
24
14
29
55
57
54 53
59
60
58
2
26
27
28
15
30
56
48
32
31
34
35
36
37
40
42
39 38
44
45
43
41
33
1
12
13
23
8
3
4
18
19
5
6
7
10
11
17
20
47
46
49
50
51
21
22
52
16
25
9
24
14
29
55
57
54 53
59
60
58
2
26
27
28
15
30
56
48
32
31
34
35
36
37
40
42
39 38
44
45
43
41
33
1
12
13
23
8
4
3
9
PNK
6
2
1
8
5
BLK/WHT
BLK
PNK
*GRN
C37-34
C37-32
C37-37
C37-38
BLK
BLK
BLU
WHT
C37-35
C37-31
WHT
BLK
RED/YEL
RED/BLU
PNK/BLU
BLK/YEL
10
7
11
5 V
5 V
I5JB0A110044-02
1. HO2S heater relay
4. “O2 HTR” fuse
7. Heater
10. Adjusting resistor
2. Shield wire
5. “IG COIL” fuse
8. To HO2S-2 heater
11. Sensor
3. Ignition switch
6. A/F sensor
9. ECM
*: For M16 engine
www.CarGarage.ir
www.CarGarage.ir
www.CarGarage.ir
