Theory Of Operation

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The Powertrain Control Module (PCM) monitors throttle position through inputs from the two Throttle Position Sensors (TPS) inside the Throttle Body Assembly. If there is a discrepancy between the two sensors, then a failure is set. If the primary diagnostic feature does not capture the failure, then secondary software will determine that there is a coherency failure between the sensors.

The Electronic Throttle Control (ETC) Motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the Throttle Body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.