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| Illustration 1 | g00507858 |
Pulse width modulated signal | |
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| Illustration 2 | g00021437 |
Schematic for typical PWM sensor | |
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| Illustration 3 | g00761125 |
Position Sensor (Joystick) | |
The base of the joystick contains a sensor that monitors the forward and rearward movement of the joystick. The sensor is a 500 Hz PWM sensor. This sensor continuously generates a PWM signal, in which the duty cycle varies in proportion to the movement of the joystick. The ECM receives the PWM signal on contact 15 (wire K706-BU) and measures the duty cycle to determine the position. When the joystick is in the center position, the duty cycle is 50%. A lower duty cycle corresponds to request for rearward movement. A higher duty cycle corresponds to a request for forward movement. The electrical system provides +battery voltage from the main power relay to the sensor on wire 135-BU.