Throttle Position Sensor (Montero)

The Throttle Position (TP) sensor, which is located in throttle body, outputs a voltage signal, which corresponds to rotational angle of throttle shaft, to Powertrain Control Module (PCM). See Fig 1. In accordance with this signal, PCM effects feedback control of throttle actuator control motor. This TP sensor uses a non-contact Hall IC to enhance its reliability.

The TP sensor consists of a permanent magnet fixed to throttle shaft, a Hall IC that outputs electrical voltage in accordance with magnetic flux density, and a stator that effectively guides magnetic flux from permanent magnet into Hall IC. See Fig 2.

The magnetic flux density that passes into Hall IC when throttle valve is fully closed is kept to a minimum, resulting in minimal electrical voltage output. See Fig 3. Magnetic flux density that passes into Hall IC when throttle valve is fully open is kept to a maximum, resulting in maximal electrical voltage output.

The TP sensor outputs through two systems (main and sub). This improves accuracy of system to detect malfunctions and reinforces fail-safe function in order to ensure reliability.

Fig 1: Cutaway View Of Throttle Position Sensor (Montero)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Exploded View Of Throttle Position Sensor (Montero)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 3: Operation Of Throttle Position Sensor (Montero)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.