P1689 code indicates a malfunction of the throttle valve’s spring performance. It occurs due to several causes and should not be avoided. One should pay close attention to it and troubleshoot it.
Don’t know how to do it? Don’t worry because I have all that covered for you. Plunge in to know it all about P1683.
What does the P1683 code mean?
A P1683 code indicates a problem with the powertrain. Most common causes include dirt in the throttle body, a poor electrical connection, or a faulty throttle body.
I will discuss each cause in greater detail, but first, it’s essential to understand how the powertrain works and the main components.
There is an electronic control system that goes by the name of electronic throttle control. They are integrated into some of the vehicles. It is responsible for controlling the valve opening of the throttle. It consists of multiple components, which are as below:
- Throttle Actuator: It is the main component of a throttle control system that takes control in two situations
- When the vehicle requires additional throttle
- During a drop in the needle of the throttle
- TP Sensor: It is a sensor that determines the opening of the throttle. Further, it also determines the airflow in the throttle.
- Throttle Valve: The throttle value supplies the air to the engine with the help of a lever.
- Control Module of Throttle Actuator: It is a complete motor assembly responsible for controlling the plate of the throttle.
- Relay of Control Actuator: The relay of the control actuator is a component of an embedded system. In simple words, it works similar to a switch.
- ECM- Engine Control Module: It is a significant part that ensures that the internal combustion engine performs optimally. It consists of multiple actuators which ensure the right performance of the engine.
- APP Sensor: APP sensor is short for accelerator pedal position. It connects the ECU with the driver. It governs the major functions and is called the brain of the car.
Related content: Traction Control Light Comes on and Car Starts Jerking
The Working and Functionality
As soon as the driver gives some acceleration by pressing the pedal, the APP sensor generates a signal. It is operated through the cable of the throttle, which aids the APP sensor in determining the opening value of the accelerator.
This digital value is then transmitted to the ECM in the form of a signal. This signal is also generated through the APP sensor. This is how the target position is determined.
The control module of the throttle actuator then takes in this targeted position. Its primary purpose is to make the throttle valve decide on the final target position.
Once that is determined, it moves to that specific position. The throttle body has a sensor corresponding to the target position. Through this sensor, the throttle valve determines the correct valve position.
Now there are two values achieved. One is the accurate one by the TP sensor, while the other one is the opening angle obtained through the throttle value. The control module of the throttle actuator makes a proper comparison of both values and generates a difference.
There is a proper value specified by which the difference should not exceed. However, if the difference is more than the specified value, a malfunction signal is sent to ECM by the control module of the throttle actuator.
Thus, this is how the throttle valve system detects the malfunction and, in turn, stores the DTC.
P1683- All the Possible Causes
Below are all the possible causes corresponding to the P1683 code.
Dirt in Throttle Body
The throttle body requires proper cleaning and maintenance. Cleaning the throttle body assists in the undisturbed and effective running of your vehicle’s engine.
Since the throttle body is responsible for taking in the air for the engine to perform effectively if you do not regularly clean the throttle body, then carbon is deposited, and dirt gets stuck.
All of which result in the sluggish performance of the vehicle. Furthermore, it reduces the fuel economy, consuming more fuel. Sometimes, the vehicle stalls too.
There are some products that are specific to throttle body cleaning. In case you encounter any of the above signs, you can use these effective cleaning products so that the dirt gets removed.
Related content: What Is RSCA Off? (Meaning & Common Problems)
Shorted Harness of Throttle Body
This is not a very probable cause of the code P1683. It doesn’t often malfunction as the wires are well insulated. They are subjected to malfunctioning when the insulation of the wires is removed.
The rest of the wiring system is more than protected except for the little part of the wire. This small amount leads its way to the TP sensor.
Whenever you encounter this issue, you can adhere to the following steps.
- Remove the connection between the TP sensor and the wire harness. Detach the TP sensor which is present on the intake face of the engine. Now take a corrected, new TP sensor and install it. Plug in the harness system.
- About an inch from the place where the whole system enters the harness, divide the wires. Now take off the insulation of those wires so that they are exposed and can be connected.
- Take a lot of butt connectors so that the wires can be inserted. Push each of the bare wires inside the butt connector. Now with the help of the crimping tool, pleat the wires into the butt connectors.
- Now take the other end of the wires and remove the insulation of those wires as well. Insert the wires of the main wiring harness on the butt connectors by properly ensuring the colors of the wires. Any mistake with the colors can lead to the malfunctioning of the TP sensor.
- Now cover the wires with electrical tape. This will ensure proper contact. This is how it can be fixed.
Electrical Connection is Poor
Since the throttle body consists of many electrical connections, the problems become certain. Sometimes the connections are affected or subject to breaking. Thus, you should always check that the connections are tight.
Defective Throttle Body
The last cause for the code P1683 is the defective throttle body which can be due to several reasons. The most probable one is the issue with the engine light. Thus, check for the engine light as well.
Related content: C1241 Code Toyota – Low Battery Positive Voltage
How much does it cost to diagnose a P1683 code?
As with any code diagnosis, the mechanic will charge you for one hour of labor, even though sometimes it might take a little less.
You can expect to pay between $75 and $150 just for the diagnosis, and depending on what is causing this error code, the repair cost can go as high as $500.
As discussed already, there can be multiple causes for a P1683 error code. However, diagnosing the problem can be relatively easy if you follow the steps described above.
If you have some mechanical experience, you can do this yourself and save the costs of the diagnosis. However, if you are inexperienced, it is always recommended to visit a repair shop, and have a professional do this for you.
Zohan writes repair manuals and technical documents for multiple automotive publications. He helps create visual guides and instructions for dealership techs and savvy car owners. Zohan collaborates with engineering teams to ensure the repair manuals accurately reflect the vehicle designs. His manuals are valued for their clear organizational structure, step-by-step visuals, and focus on safety.