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EC-116 < COMPONENT DIAGNOSIS > [VQ40DE] P0101 MAF SENSOR P0101 MAF SENSOR Component Description INFOID:0000000005257087 The mass air flow sensor (1) is placed in the stream of intake air. It measures 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 greater air flow, the greater the heat loss. Therefore, the electric current supplied to 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. On Board Diagnosis Logic INFOID:0000000005257088 DTC Confirmation Procedure INFOID:0000000005257089 Perform PROCEDURE FOR MALFUNCTION A first. If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B. NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next step. PROCEDURE FOR MALFUNCTION A NOTE: If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead of running engine at idle speed. With CONSULT-III 1. Start engine and warm it up to normal operating temperature. 2. Run engine for at least 10 seconds at idle speed. 3. Check 1st trip DTC. 4. If 1st trip DTC is detected, go to With GST Follow the procedure “With CONSULT-III” above. PROCEDURE FOR MALFUNCTION B PBIA9559J DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0101 Mass air flow sensor cir- A) A high voltage from the sensor is sent to ECM • Harness or connectors (The sensor circuit is open or • Mass air flow sensor sensor • Intake air temperature sensor B) A low voltage from the sensor is sent to ECM un- • Harness or connectors (The sensor circuit is open or • Intake air leaks sensor • Intake air temperature sensor 2010 Pathfinder |