![]() ![]() The TCIL indicates overdrive cancel mode activated (lamp on) and electronic pressure control (EPC) circuit shorted (lamp flashing) or monitored sensor failure. The powertrain control module energizes the transmission control indicator lamp (TCIL) when the switch is off. When the switch is pressed, a signal is sent to the powertrain control module to allow automatic shifts from first through fourth gears or first through third gears only. The transmission control switch (TCS) is a momentary contact switch.The powertrain control module then controls actuators which determine transmission operation. ![]() Many input sensors provide information to the powertrain control module. The operation of the transmission is controlled by the powertrain control module.The IAT sensor is also used in determining Electronic Pressure Control (EPC) pressures. The IAT sensor is installed in the air cleaner outlet tube.The TP sensor is used for shift scheduling, electronic pressure control, and the TCC. The TP sensor detects the position of the throttle plate and sends this information to the powertrain control module. The throttle position (TP) sensor is a potentiometer mounted on the throttle body.For transmission strategies, the MAF sensor is used to regulate Electronic Pressure Control (EPC), shift and torque converter clutch scheduling. The MAF sensor output signal is used by the powertrain control module to calculate injector pulse width. The mass air flow (MAF) sensor measures the mass of air flowing into the engine. ![]()
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