Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The throttle pedal produces two voltage signals proportional to the pedal movement. The primary signal varies between 0 and 5.0 Volts and the secondary signal varies between 0 and 2.5 Volts. The Powertrain Control Module (PCM) uses the two signals to validate throttle pedal position to control engine fueling. The PCM illuminates the MIL lamp and ETC light solid immediately after the diagnostic runs and fails. Acceleration rate and Engine output are limited. The PCM will turn off the MIL lamp after the diagnostic runs and passes in four consecutive drive cycles.