DTC P0031: Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032: Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1): Description
WARNING: This page is about a different variant/trim than selected.
Refer to DTC P2195. Refer to DESCRIPTION .
HINT:
- When either of these DTCs is set, 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 the oxygen sensor, these DTCs relate to the air fuel ratio sensor.
- The ECM uses pulse width modulation 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. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0031 | Air fuel ratio sensor heater current is less than 0.8 A, even when the air fuel ratio sensor heater duty cycle is 50% or higher (1 trip detection logic). |
|
| P0032 | Air fuel ratio sensor heater current reaches the high limit (Hybrid IC high current limiter monitor input "Fail") (1 trip detection logic). |
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