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DTC Detecting Condition and Trouble Area

DTC DETECTING CONDITION CHART

DTC detecting condition Trouble area
P0037: HO2S Heater Control Circuit Low (Sensor 2) 
Output voltage of HO2S heater drive circuit is lower than 8.95 V for 5 sec. even if control duty ratio of HO2S heater is lower than 75%. (2 D/C detection logic)
  • HO2S heater and/or its circuit
  • HO2S heater relay
  • ECM
P0038: HO2S Heater Control Circuit High (Sensor 2) 
Output voltage of HO2S heater drive circuit is higher than 8.95 V for 5 sec. even if control duty ratio of HO2S heater is higher than 25%.
(2 D/C detection logic)
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