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6-72 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0136 HEATED OXYGEN SENSOR (HO2S) CIRCUIT MALFUNCTION
(SENSOR-2)
WIRING DIAGRAM / CIRCUIT DESCRIPTION
DTC DETECTING CONDITION
DTC will set when one of the following conditions is detected.
• Max. output voltage of HO2S-2 is lower than specified value or
Min. output voltage is higher than specified value while vehicle
driving.
• Engine is warmed up and HO2S-2 voltage is 4.5 V or more.
(circuit open)
✱2 driving cycle detection logic, monitoring once/1 driving.
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 be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out with 2 persons, a driver and a tester, on a level road.
1) Turn ignition switch OFF.
Clear DTC with ignition switch ON, check vehicle and environmental condition for :
– Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
– Ambient temp. : –10°C, 14°F or higher
– Intake air temp. : 70°C, 158°F or lower
– No exhaust gas leakage and loose connection
2) Warm up engine to normal operating temperature.
3) Drive vehicle under usual driving condition for 5 min. and check HO2S-2 output voltage and "short term fuel
trim" with "Data List" mode on scan tool, and write it down.
4) Stop vehicle (don't turn ignition switch OFF).
5) Increase vehicle speed to higher than 20 mph, 32 km/h and then stop vehicle.
E11
YEL
C42 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
BRN
C41-13
C42-10
ORN
C41 (24P)
G02 (17P)
7
6
5
4
3
2
1
6
5
16
15
14
13 12
11
10
9
8
12
11
24
23
22
21
20
19
18
17
17
16
• Exhaust gas leakage
• "BRN", "YEL" or "ORN" circuit open or
short
• Heated oxygen sensor-2 malfunction
• Fuel system malfunction
ECM
4
3
2
1
10
9
8
7
15
14
13
POSSIBLE CAUSE
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