6-80 ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES)
DTC P0141 HO2S-2 Heater Circuit Malfunction
WIRING DIAGRAM
Refer to DTC P0136.
DTC DETECTING CONDITION AND TROUBLE ARE
DTC CONFIRMATION PROCEDURE
1) Connect scan tool with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data in ECM memory by using scan
tool and start engine.
3) Increase vehicle speed to 50 – 60 km/h (30 – 40 mph).
4) Keep driving above vehicle speed for 5 min. (Change of vehicle speed is permitted in this step).
5) Stop vehicle and check if DTC and pending DTC exists by using scan tool. If not, check if oxygen sensor
heater monitoring test has completed by using scan tool. If not in both of above checks (i.e., no pending DTC
and oxygen sensor heater monitoring test not completed), check vehicle conditions (environmental) and
repeat Steps 3) through 5).
DTC DETECTING CONDITION TROUBLE AREA
Following condition is detected when HO2S-2 heater operates.
• Current of HO2S-2 heater is more than 5.3 A or less than 0.15 A,
or
• Voltage of HO2S-2 heater is more than 13.8 V or less than 8.7 V.
(2 driving cycles detection logic)
• HO2S-2 heater or its circuit
• ECM (PCM)
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.
NOTE:
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation
Procedure”.
• Intake air temp. : –8°C, 18°F or higher
• Engine coolant temp. : –8 – 110°C (18 – 230°F)
• Altitude (barometric pressure) : 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
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