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6-104 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0137 O2 Sensor (HO2S) Circuit Low Voltage (Sensor-2)
DTC P0138 O2 Sensor (HO2S) Circuit High Voltage (Sensor-2)
WIRING DIAGRAM
BLK/YEL
3
WHT/BLU
1
80A
60A
C64
7
6
5
4
17
16
15
14
13
12
27
26
25
24
23
22
34
33
32
1. Relay/fuse box
2. Shield wire
3. Ignition switch
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
DTC P0137:
The voltage of HO2S–2 sensor is more than 4.5 V with HO2S–2
heater ON.
DTC P0138:
When the minimum voltage of HO2S–2 sensor is more than 0.4 V
or the average voltage of the sensor is more than 0.9 V, DTC
P0138 is detected after the following driving sequence.
1) Drive the vehicle with the speed of 80 km/h (50 mile/h) at 5th
gear or D range.
2) Release the accelerator pedal for more than 4 seconds.
3) Stop the vehicle at the idle state for 6 seconds.
(2 driving cycle detection logic)
DTC CONFIRMATION PROCEDURE
WARNING:
• When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 person, a driver and tester, on a level road.
4
BLK/WHT
5
BLK/WHT
8
C63
3
2
1
7
6
5
4
3
11
10
9
8
19
18
17
16
15
14
13
12
21
20
19
18
27
26
25
24
31
30
29
28
35
34
33
32
4. Circuit fuse box
5. "IG" fuse
6. HO2S–2
6
BLK/WHT
2
7
ORN
G91
2
1
6
5
4
3
11
10
9
8
16
15
14
13
12
11
10
23
22
21
20
27
26
25
24
23
22
21
20
31
30
29
28
35
34
33
32
31
7. Heater
8. To HO2S–1 heater
9. ECM
• HO2S–2
• HO2S–2 circuit
• Fuel system
• ECM
• Fuel shortage
9
BLK/WHT
G91-28
C64-3
RED/BLU
C63-33
BRN
C63-28
ORN
10
2
1
9
8
7
19
18
17
30
29
28
10. To other sensor
TROUBLE AREA
5 V
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