![]() ![]() So the meter's output voltage drops as airflow increases. ![]() The greater the air flow, the higher the resistance created by the potentiometer. This changes the airflow meter's output voltage in proportion to airflow. Connected to the flap is a arm that rubs across a resistor grid (potentiometer). A flap inside the meter rotates when incoming air pushes against it. On the older Toyota EFI systems, air flow is measured mechanically with a flap-style airflow meter. To regulate the air/fuel mixture, the engine computer needs to know how much air is being sucked into the engine. HOW TOYOTA FUEL INJECTION MEASURES AIRFLOW Even so, older high mileage cars and trucks can develop problems common to all fuel injection systems: pumps wear out, regulators fail, injectors become dirty or worn, cold start injectors can leak, and intake systems can become restricted due to accumulated carbon and fuel varnish. The system has evolved over the years and has earned a reputation for being relatively trouble-free. The multiport fuel injection system Toyota has used from the early 1980s to the 1990s on its various engine families is based on the Bosch L-Jetronic system. Auto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Indexĭiagnose Toyota Fuel Injection by Larry Carley copyright 2019 ![]()
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