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. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the maximum voltage of the sensor is sufficiently high during various driving conditions such as fuel-cut.
| : 0.72 V |
The maximum voltage from the sensor does not reach the specified voltage.
| DTC | CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition | ||
| P0137 | HO2S2 (B1) (O2 sensor circuit low voltage bank 1 sensor 2) |
A | Diagnosis condition | - |
| Signal (terminal) | Voltage signal transmitted from heated oxygen sensor 2 to ECM | |||
| Threshold | The maximum voltage from the sensor does not reach the specified voltage | |||
| Diagnosis delay time | - | |||
| B | Diagnosis condition | - | ||
| Signal (terminal) | - | |||
| Threshold | ECM detects the heated oxygen sensor 2 heater circuit is short to ground. | |||
| Diagnosis delay time | - | |||
| P0157 | HO2S2 (B2) (O2 sensor circuit low voltage bank 2 sensor 2) |
Diagnosis condition | - | |
| Signal (terminal) | Voltage signal transmitted from heated oxygen sensor 2 to ECM | |||
| Threshold | The maximum voltage from the sensor does not reach the specified voltage | |||
| Diagnosis delay time | - | |||