DTC Detecting Condition and Trouble Area

WARNING: This page is about a different car, the 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTING CONDITION CHART

DTC detecting condition	Trouble area
DTC P0051 HO2S Heater Control Circuit Low (Sensor-1, Bank-2): Circuit current of A/F sensor (bank-2) heater is lower than 0.8 A for more than 4 sec. continuously while control duty ratio of A/F sensor heater is more than 22% with engine running. (2 driving cycle detection logic) DTC P0052 HO2S Heater Control Circuit High (Sensor-1, Bank-2): Circuit current of A/F sensor (bank-2) heater is higher than 10.5 A at ON duty pulse or 0.8 A at OFF duty pulse for more than 4 sec. continuously while control duty ratio of A/F sensor heater is more than 22% with engine running. (2 driving cycle detection logic)	A/F sensor heater circuit A/F sensor ECM

DTC detecting condition

Trouble area

DTC P0051 HO2S Heater Control Circuit Low (Sensor-1, Bank-2):
Circuit current of A/F sensor (bank-2) heater is lower than 0.8 A for more than 4 sec. continuously while control duty ratio of A/F sensor heater is more than 22% with engine running. (2 driving cycle detection logic)
DTC P0052 HO2S Heater Control Circuit High (Sensor-1, Bank-2):
Circuit current of A/F sensor (bank-2) heater is higher than 10.5 A at ON duty pulse or 0.8 A at OFF duty pulse for more than 4 sec. continuously while control duty ratio of A/F sensor heater is more than 22% with engine running. (2 driving cycle detection logic)

A/F sensor heater circuit
A/F sensor
ECM