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P0101 MAF SENSOR EC-233 < DTC/CIRCUIT DIAGNOSIS > [MR FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O P0101 MAF SENSOR DTC Logic INFOID:0000000012197789 DTC DETECTION LOGIC NOTE: If DTC P0101 is displayed with other DTC, first perform the trouble diagnosis for other DTC. DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce- dure 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. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and warm it up to normal operating temperature. 2. Drive the vehicle for at least 5 seconds under the following conditions: CAUTION: Always drive vehicle at safe speed. NOTE: • The gear must be fixed while driving the vehicle. • Keep the accelerator pedal as steady as possible during cruising. 3. Check 1st trip DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000012197790 1. CHECK INTAKE SYSTEM Check the following for connection. • Air duct • Vacuum hoses • Intake air passage between air duct and intake manifold YES >> GO TO 2. NO >> Reconnect the parts. 2. CHECK MASS AIR FLOW (MAF) SENSOR POWER SUPPLY DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause P0101 MAF SEN/CIRCUIT-B1 • A high voltage from the sensor is sent to ECM under light load driving condition. • A low voltage from the sensor is sent to ECM under heavy load driving condition. • Harness or connectors (MAF sensor circuit is open or short- • Intake air leaks Selector lever Suitable position Vehicle speed 40 km/h (25 MPH) or more |