DTC P1683: Throttle Valve Default Position Spring Performance Problem: General Description

The electronic throttle control system (ETCS) controls the throttle valve opening. The system is composed of the throttle actuator, the throttle valve, throttle position (TP) sensors A and B, the ETCS control relay, the accelerator pedal position (APP) sensor, and the engine control module (ECM)/powertrain control module (PCM). The throttle valve default position spring is attached to the throttle valve gear. It opens the throttle valve to improve starting performance in cold conditions, or to retain minimum running performance in case of an electronic throttle control system failure. If the throttle valve does not return to the default position when the throttle actuator moves to the default position from the fully closed position, a malfunction is detected and the malfunction data is transmitted to the ECM/PCM. When the ECM/PCM receives the malfunction data from the ETCS, the ECM/PCM detects the malfunction of the throttle valve default position spring and a DTC is stored.