The PCM/ECM determines when a rear HO2S heater fault occurs and sets DTC P0036 if measured rear HO2S resistance is lower than the predetermined threshold.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Evaluate O2 sensor Element Temperature via measuring Element Resistance | 1. Related fuse blown or missing 2. Heater control circuit open or short 3. Power supply circuit open or short 4. Poor connection or damaged harness 5. Faulty HO2S |
Enable Conditions |
•
O2 sensor pre-heating phase finished (dew point passed)
•
No relevant failure
•
Coolant temperature drop since the last engine stop > 25℃(77℉)
•
10V< Battery voltage <16V
•
3.5%< O2 sensor heater control duty < 96.5%
•
O2 sensor operative ready (to ensure no open circuit failure present) | |
Threshold Value |
•
Too slow O2 sensor tip-temperature increase after Start causing too low catalyst diagnosis result(O2 Sensor Heater Power < 20% of Nominal Heater Power) | |
Diagnostic Time |
•
130 seconds | |
Mil On Condition |
•
2 Drive Cycles |
