DTC Detection Logic
The heated oxygen Sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) Sensor 1. The oxygen storage capacity of the three way catalyst (manifold) causes the longer switching time.
MALFUNCTION 1
To judge the malfunctions of heated oxygen Sensor 2, ECM monitors whether the voltage is unusually high during various driving conditions such as fuel cut.
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: 1.3 V |
MALFUNCTION 2
To judge the malfunctions of heated oxygen Sensor 2, ECM monitors whether the minimum voltage of Sensor is sufficiently low during various driving conditions such as fuel-cut.
- An excessively high voltage from the Sensor is sent to ECM.
- The minimum voltage from the Sensor is not reached to the specified voltage.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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P0138 |
HO2S2 (B1) (O2 Sensor circuit high voltage bank 1 Sensor 2) |
1 |
Diagnosis condition |
-- |
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Signal (terminal) |
Voltage signal transmitted from heated oxygen Sensor 2 to ECM |
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Threshold |
An excessively high voltage from the Sensor is sent to ECM |
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Diagnosis delay time |
-- |
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2 |
Diagnosis condition |
-- |
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Signal (terminal) |
Voltage signal transmitted from heated oxygen Sensor 2 to ECM |
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Threshold |
The minimum voltage from the Sensor is not reached to the specified voltage |
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Diagnosis delay time |
-- |
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P0158 |
HO2S2 (B2) (O2 Sensor circuit high voltage bank 2 Sensor 2) |
1 |
Diagnosis condition |
-- |
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Signal (terminal) |
Voltage signal transmitted from heated oxygen Sensor 2 to ECM |
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Threshold |
An excessively high voltage from the Sensor is sent to ECM |
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Diagnosis delay time |
-- |
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2 |
Diagnosis condition |
-- |
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Signal (terminal) |
Voltage signal transmitted from heated oxygen Sensor 2 to ECM |
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Threshold |
The minimum voltage from the Sensor is not reached to the specified voltage |
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Diagnosis delay time |
-- |
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