Normal Mode

During the operation of the throttle actuator control (TAC) system, several modes or functions are considered normal. The following modes may be entered during normal operation:

• Normal control with APP values-In this operating mode, the PCM controls throttle movement according to APP sensor input. This mode will continue until an error is detected in the APP sensor input or other critical data.
• Learned idle mode-When ever the powertrain control module (PCM) recognizes the learned idle throttle position (TP) value, the engine operates in the learned idle mode. In the learned idle mode, the PCM uses stored engine performance settings in order to provide the best quality idle for all idle speed situations.
• Cold engine start mode-The throttle valve has a default start position that ensures improved cold engine starting and cold engine operation.