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P0137 HO2S2 EC-273 < DTC/CIRCUIT DIAGNOSIS > [MR FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O P0137 HO2S2 DTC Logic INFOID:0000000012197832 DTC DETECTION LOGIC The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy- gen storage capacity of the three way catalyst (manifold) causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, ECM monitors whether the maximum voltage of the sensor is sufficiently high during the various driving condition such as fuel- cut. DTC CONFIRMATION PROCEDURE 1. INSPECTION START Do you have CONSULT? YES >> GO TO 2. NO >> GO TO 5. 2. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 °C (32 to 86°F). >> GO TO 3. 3. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT 1. Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch OFF and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 5. Let engine idle for 1 minute. 6. Make sure that “COOLAN TEMP/S” indicates more than 70 °C (158°F). If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches 70 °C (158°F). 7. Open engine hood. 8. Select “HO2S2 (B1) P1147” of “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT. SEF259VA DTC No. Trouble diagnosis name (Trouble diagnosis con- tent) DTC detecting condition Possible cause P0137 HO2S2 (B1) The maximum voltage from the heated oxygen • Harness or connectors (Heated oxygen sensor 2 circuit is open • Heated oxygen sensor 2 |