RAM SRT-10 Pickup V10-505 8.3L (2004)
Throttle Position Sensor: Description and Operation
The TPS (1) is mounted on the passenger side of the throttle body. The sensor connects to the throttle blade shaft. The TPS is a variable resistor that
provides the Powertrain Control Module (PCM) with an input signal (voltage).
The 3-wire TPS provides the Powertrain Control Module (PCM) with an input signal (voltage) that represents the throttle blade position of the throttle
body. The sensor is connected to the throttle blade shaft. As the position of the throttle blade changes, the output voltage of the TPS changes. The PCM
supplies approximately 5 volts to the TPS. The TPS output voltage (input signal to the PCM) represents the throttle blade position. The PCM receives an
input signal voltage from the TPS. This will vary in an approximate range of from .26 volts at minimum throttle opening (idle), to 4.49 volts at wide
open throttle. Along with inputs from other sensors, the PCM uses the TPS input to determine current engine operating conditions. In response to engine
operating conditions, the PCM will adjust fuel injector pulse width and ignition timing.
The PCM needs to identify the actions and position of the throttle blade at all times. This information is needed to assist in performing the following
calculations:
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Ignition timing advance
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Fuel injection pulse-width
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Idle (learned value or minimum TPS)
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Off-idle (0.06 volt)
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Wide Open Throttle (WOT) open loop (2.608 volts above learned idle voltage)
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Deceleration fuel lean out
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Fuel cutoff during cranking at WOT (2.608 volts above learned idle voltage)
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A/C WOT cutoff (certain automatic transmissions only)
