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EC-158 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] P0101 MAF SENSOR P0101 MAF SENSOR Component Description INFOID:0000000006158574 The mass air flow sensor is placed in the stream of intake air. It mea- sures the intake flow rate by measuring a part of the entire intake flow. The mass air flow sensor controls the temperature of the hot wire to a certain amount. The heat generated by the hot wire is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the electric current supplied to the hot wire is changed to maintain the temperature of the hot wire as air flow increases. The ECM detects the air flow by means of this current change. DTC Logic INFOID:0000000006598688 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 BBIA0355E DTC No. Trouble diagnosis (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 (The sensor circuit is open or short- • Intake air leaks Selector lever Suitable position Vehicle speed 40 km/h (25 MPH) or more |