DTC Detecting Condition and Trouble Area

DTC DETECTING CONDITION AND TROUBLE AREA

DTC detecting condition	Trouble area
P0031: Heater control circuit voltage of A/F sensor is lower than specification for more than specified time even though control duty ratio of A/F sensor heater is less than 90% with engine running. (Heater control duty pulse is not detected in its circuit of ECM) (2 driving cycle detection logic) P0032: Heater control circuit voltage of A/F sensor is higher than specification for more than specified time even though control duty ratio of A/F sensor heater is more than 10% with engine running. (Heater control duty pulse is not detected in its circuit of ECM) (2 driving cycle detection logic)	A/F sensor heater and/or its circuit ECM

DTC detecting condition

Trouble area

P0031:
Heater control circuit voltage of A/F sensor is lower than specification for more than specified time even though control duty ratio of A/F sensor heater is less than 90% with engine running. (Heater control duty pulse is not detected in its circuit of ECM) (2 driving cycle detection logic)
P0032:
Heater control circuit voltage of A/F sensor is higher than specification for more than specified time even though control duty ratio of A/F sensor heater is more than 10% with engine running. (Heater control duty pulse is not detected in its circuit of ECM) (2 driving cycle detection logic)

A/F sensor heater and/or its circuit
ECM