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DTC NO. DTC DETECTION CONDITION TROUBLE AREA Gas leak from exhaust system EGR valve assembly ECM P013A P013C Heated oxygen sensor voltage does not drop from 0.35 V to 0.2 V immediately after fuel cut starts (1 trip detection logic). HO2 sensor (for Bank 1, 2 Sensor 2) circuit HO2 sensor (for Bank 1, 2 Sensor 2) Gas leak from exhaust system EGR valve assembly ECM MONITOR DESCRIPTION 1. Active Air-Fuel Ratio Control The ECM usually performs air-fuel ratio feedback control so that the Air-Fuel Ratio (A/F) sensor output indicates a near stoichiometric air-fuel level. This vehicle includes active air-fuel ratio control in addition to regular air-fuel ratio control. The ECM performs active air-fuel ratio control to detect any deterioration in the Three-Way Catalytic Converter (TWC) and Heated Oxygen (HO2) sensor malfunctions (refer to the diagram below). Active air-fuel ratio control is performed for approximately 15 to 20 seconds while driving with a warm engine. During active air-fuel ratio control, the air-fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is stored. is not functioning properly, the voltage output variation is small. For example, when the HO2 sensor voltage does not increase to more than 0.66 V during active air-fuel ratio control, the ECM determines that the sensor voltage output is abnormal and stores DTC P0136 or P0156. 3. Open in Heated Oxygen (HO2) Sensor Circuit (DTC P0137 and P0157) 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,... |