The PCM 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. Poor Connector Connection 2. Defected related fuse 3. Open/Short in Power Circuit 4. Open/Short in Control Circuit 5. Defected Downstream O2 Sensor |
Enable Conditions |
•
Engine speed during engine start higher than 640 RPM to 960 RPM depending on start ECT
•
Downstream O2 Sensor Heater Pulse Width Modulation(PWM) higher than 3.5% and lower than 96.5%
•
Downstream O2 sensor pre-heating phase finished
•
77℉(25℃) ECT drop since last engine stop
•
Downstream O2 sensor operative readiness detected; [Downstream O2 sensor voltage lower than 0.25V and higher than 0.56V & Downstream O2 sensor max heating finished or Downstream Exhaust gas Temp. higher than 842℉(450℃)]
•
Battery voltage higher than 11 V and lower than 16 V
•
No relevant DTC present | |
Threshold Value |
•
Too slow Downstream O2 sensor tip Temp. increase after engine start causing too low catalyst diagnosis result
•
Downstream O2 sensor internal resistance higher than 10000Ω to 18000Ω versus time after start(O2 sensor heater power lower than 20% of nominal heater power) | |
Diagnostic Time |
•
130 sec. | |
Mil On Condition |
•
2 Driving Cycle |
