toyota 4runner mass air flow sensor problems

Often mass air flow sensor readings are measured at idle, 1,000 RPM, 2,000 RPM and 3,000 RPM. Mass Airflow Sensor (MAF) readings of a 2.4L 4-cylinder engine at different RPMs. They compare the readings to the specifications or to the readings of a known-good mass airflow sensor. Mechanics measure the amount of air flow (mass air flow sensor readings) at different RPMs. In modern cars, the only way to test the mass air flow sensor is with a scan tool. Trouble codes P0171 System Too Lean (Bank 1) and P0174 System Too Lean (Bank 2) are also often caused by a bad or contaminated mass air flow sensor. P0104 - 'Mass Air Flow Circuit Intermittent' P0101 - Mass Air Flow Circuit Range/Performance P0100 - Mass Air Flow Circuit Malfunction The following trouble codes are usually associated with a mass air flow sensor: This trouble code can be retrieved with a scan tool. When the air flow sensor signal varies from the expected range, the PCM records a fault and stores the corresponding trouble code, illuminating the Check Engine light on the dash. In addition, a faulty mass air flow sensor might cause the Check Engine or Service Engine Soon light to come on.Ī problem with the air flow sensor could also alter the shifting pattern of the automatic transmission. As a result, a bad mass air flow sensor causes various driveability problems, including a no-start, stalling, lack of power and poor acceleration.

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Toyota 4runner mass air flow sensor problems