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Heated oxygen sensor heater range check (P0037, P0038, P0057, The ECM monitors the current applied to the O2 sensor heater to check the heater for malfunctions. If the current is below the threshold value, the ECM determines that there is an open circuit in the heater. If the current is above the threshold value, the ECM determines that there is a short circuit in the heater. The ECM constantly monitors the current applied to the heater. If the ECM detects an open or short circuit, the ECM turns the MIL on and sets a DTC. If a malfunction is detected, the ECM cuts off the current applied to the heater. Heated oxygen sensor heater performance (P0141 and P0161): After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using the battery voltage and the current applied to the heater. If the resistance is above the threshold value, the ECM determines that there is a malfunction in the HO2 sensor heater and sets DTC P0141 or P0161. MONITOR STRATEGY Related DTCs P0037: Heated oxygen sensor heater (for Bank 1) range check (Low electrical current) P0038: Heated oxygen sensor heater (for Bank 1) range check (High electrical current) P0057: Heated oxygen sensor heater (for Bank 2) range check (Low electrical current) P0058: Heated oxygen sensor heater (for Bank 2) range check (High electrical current) P0141: Heated oxygen sensor heater performance (for Bank 1) P0161: Heated oxygen sensor heater performance (for Bank 2) P102D: Heated oxygen sensor heater stuck ON (for Bank 1 Sensor 2) P105D: Heated oxygen sensor heater stuck ON (for Bank 2 Sensor 2) Required Sensors/Components (Main) Heated oxygen sensor heater Required Sensors/Components (Related) - Once per driving cycle: P0141 and P0161 Duration 0.5 seconds: P0037, P0057, P102D and P105D Within 3 seconds: P0038 and P0058 10 seconds: P0141 and P0161 MIL Operation Immediate: P0037, P0038, P0057, P0058, P102D and P105D 2 driving cycles: P0141 and P0161 TYPICAL ENABLING CONDITIONS P0037 and P0057 (Case 1) Monitor runs whenever following DTCs not stored None 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0037,P003... |