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What is the Automotive Data Flow Mnemonic?

1 Answers

DelilahLynn

07/30/25 3:42am

Automotive data flow mnemonic is as follows: 1. Mass Air Flow (MAF) Sensor: The MAF sensor measures air intake; the amount of air drawn in determines the fuel injected; calculation relies on the air-fuel ratio (14.7:1). 2. Intake Air Temperature (IAT) Sensor: The IAT sensor measures air temperature; its purpose is to estimate air volume and adjust fuel injection; located on the intake manifold or integrated with the MAF; functionality similar to coolant temperature sensor, measuring resistance based on temperature; 2~3KΩ at 20℃, 0.4~0.7KΩ at 60℃. 3. Manifold Absolute Pressure (MAP) Sensor: The MAP sensor indirectly measures air intake; high vacuum when throttle is released, low vacuum when pressed; more fuel injected at low vacuum, proportional at medium/low loads; easily found behind the throttle body. 4. Throttle Position Sensor (TPS): Remember the TPS's five key states; closed throttle indicates idle with signal voltage below 1V; wide-open throttle signals high load at ~4.8V; controls both engine and transmission. 5. Coolant Temperature Sensor (CTS): The CTS relies on thermistor properties; located in coolant passages, irreplaceable for temperature signals; affects fuel correction and indirectly influences mixture; tested via resistance at different temps: 2~3KΩ at 20℃, 0.2~0.4KΩ at 80℃. 6. Knock Sensor: Piezoelectric knock sensor typically mounted on cylinder block; detects vibration frequency (6~9KHz) and retards ignition timing; when knocking stops, timing advances; maintains optimal ignition point at knock threshold.

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