P1683 - FAULT CODE - OBD2

The ETCS (Electronic Throttle Control System) is responsible for controlling when the throttle valve opens. This system includes an actuator, the throttle valve, throttle position sensors A and B, the throttle actuator control module, a control module relay, the Accelerator Pedal Position Sensor (APP), and the Engine Control Module (ECM).

The APP sensor is driven by a throttle cable, and in this way, the throttle opening value is calculated after the pedal is pushed. The pedal opening value is transformed into an electrical signal that the APP sensor transmits to the ECM to calculate the goal position. The targeted signal is sent to the Throttle Actuator Control Module, which is responsible for determining the valve position.

The Throttle Actuator Control Module matches the target throttle valve opening angle with the actual opening angle provided by Throttle Position Sensor A. If the comparison shows a large difference exceeding the allowable values, the ECM will receive this information indicating a malfunction and will set a DTC indicating the situation. In the case of OBD2 code P1683, it indicates that the malfunctions were detected by the throttle valve default position spring.

• Check Engine light illuminated.
• Difficulties in acceleration.

The P1683 OBDII diagnostic code is set for one of the following reasons:

• The throttle body could be dirty.
• The Electronic Throttle Control System wiring may be faulty.
• Electronic Throttle Control System connections may be faulty, causing unstable operation.
• ETCS may be in poor condition.

To resolve the P1683 OBD2 fault code you must do the following:

• Consult the TSB.
• With a scan tool check if additional DTCs are stored in addition to P1683, which are related to the throttle system. If such codes are found, the diagnosis should be in the order indicated by the scan tool.
• Inspect the throttle body to make sure there are no dirt or blockages in the throttle body. If such conditions are found, make the pertinent corrections.
• Verify that the Electronic Throttle Control System has no damage to its cables or connectors. If you detect deficiencies due to corrosion or wear, make the necessary repairs.
• Check the Electronic Throttle Control System circuit for damage causing a short or open circuit. Repair it as required.