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Battery voltage 10.5 V or higher Fuel cut OFF Time after fuel cut ON to OFF 30 seconds or more Accumulated heater ON time 100 seconds or more Learned heater OFF current operation Complete P0141 and P0161 (Case 2) Monitor runs whenever following DTCs not stored None Duration that rear heated oxygen sensor impedance is less than 15 kΩ 2 seconds or more P102D and P105D Monitor runs whenever following DTCs not stored P0037, P0038, P0057, P0058 (Rear oxygen sensor heater) Battery voltage 10.5 V or higher Engine Running Starter OFF Catalyst active A/F control Not operating Time after heater ON 10 seconds or more Learned heater OFF current operation Complete Hybrid IC high current limiter port Fail TYPICAL MALFUNCTION THRESHOLDS P0037 and P0057 (Case 1) Heater current - Learned heater OFF current 0.3 A or less P0037 and P0057 (Case 2) Heated oxygen sensor heater ON current 1 A or less P0038 and P0058 Hybrid IC high current limiter port Fail Heated oxygen sensor heater output ON P0141 and P0161 Accumulated heater resistance Varies with sensor element temperature (Example: Higher than 23 Ω) P102D and P105D Heated oxygen sensor heater ON current Higher than 1 A 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P0038,... |