DTC P0030-12: HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery; DTC P0030-13: HO2S Heater Control Bank 1 Sensor 1 Circuit Open; DTC P0050-12: HO2S Heater Control Bank 2 Sensor 1 Circuit Short to Battery; DTC P0050-13: HO2S Heater Control Bank 2 Sensor 1 Circuit Open; DTC P101A-9E: A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On; DTC P103A-9E: A/F Sensor Heater Performance Bank 2 Sensor 1 Stuck On [12/2019 - 10/2022]: Description
The air fuel ratio sensor generates voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection duration. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.
The air fuel ratio sensor is a planar type and integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are a narrow type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, therefore sensor activation is accelerated.
In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.
*: Value changes inside the ECM. Since the air fuel ratio sensor is a current output element, the current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.
HINT:
- When any of these DTCs are stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor heater in fail-safe mode. Fail-safe mode continues until the ignition switch is turned off.
- Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
- The ECM has a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor heater circuit uses a relay on the +B side of the circuit.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P0030-12 | HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery | Air fuel ratio sensor heater current reaches the high limit (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0032 DTC for Mexico Models: - Applies |
| P0030-13 | HO2S Heater Control Bank 1 Sensor 1 Circuit Open | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 30% or higher (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0031 DTC for Mexico Models: - Applies |
| P0050-12 | HO2S Heater Control Bank 2 Sensor 1 Circuit Short to Battery | Air fuel ratio sensor heater current reaches the high limit (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0052 DTC for Mexico Models: - Applies |
| P0050-13 | HO2S Heater Control Bank 2 Sensor 1 Circuit Open | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 30% or higher (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0051 DTC for Mexico Models: - Applies |
| P101A-9E | A/F Sensor Heater Performance Bank 1 Sensor 1 Stuck On | Air fuel ratio sensor heater current is higher than the specified value while the heater is not operating (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P101D DTC for Mexico Models: - Applies |
| P103A-9E | A/F Sensor Heater Performance Bank 2 Sensor 1 Stuck On | Air fuel ratio sensor heater current is higher than the specified value while the heater is not operating (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P103D DTC for Mexico Models: - Applies |