Throttle position sensors typically mount on the throttle body, directly to the end of the throttle shaft. Depending on engine and model year, Toyota EFI equipped engines use one of two different types of throttle position sensors. These sensors are categorized as on-off type and linear type. The linear type sensor is typically used on most late model Electronically Controlled Transmission (ECT) equipped vehicles.
The on-off type sensor circuits can be further broken down into first and second design. This sensor is typically used on manual or non-ECT transmission equipped applications.
All throttle sensors, regardless of design, supply the ECU with vital information about idle status and driver demand. This information is used by the ECU to make judgments about power enrichment, deceleration fuel cut-off, idle stability, and spark advance angle corrections.
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