3116 and 3126 Truck Engines Throttle Position Sensor Adjustment

The Throttle Position Sensor (TPS) is used to provide a throttle signal to the Electronic Control Module (ECM). Sensor output is a constant frequency signal whose pulse width varies with throttle position. This output signal is referred to as either “Duty Cycle” or a “Pulse Width Modulated (PWM)” signal and is expressed as a percentage. When correctly adjusted, the TPS will produce a “Duty Cycle” signal of 10 percent to 22 percent at the low idle throttle position and 75 percent to 90 percent at the maximum throttle position. This signal is translated by the ECM into a “Throttle Position” signal of 3 percent at low idle and 100 percent at maximum throttle.

NOTE: The Remote Mounted Throttle Sensor can be calibrated and can get out of calibration. It is not expected that this sensor will be used for the driver’s throttle sensor for these engines. It is possible that this sensor may be used in a PTO application. If calibration is required, refer to PTO Installation And Application Guide, SEHS9857.

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