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Types of Vehicle Diagnostics Vehicle diagnostics can be used to determine the cause of a variety of issues that arise in a vehicle. There are a variety of diagnostic tools available. The service technician will select the most appropriate one based upon the condition of the vehicle and the condition. OBD-II, CANBUS are two examples of these tools. The right tool for the job will help the technician diagnose the issue and make the repairs required. OBD-II OBD-II diagnostics for vehicles are made with the use of sensors to detect problems with vehicles. The sensors transmit abnormal data to the vehicle's engine control unit (ECU) that stores it as an Diagnostic Trouble Code (DTC). This code is a string of numbers and letters which indicate the nature and cause of the problem. OBD II codes cover all aspects of a vehicle, including the chassis, body powertrain, as well as the network. There are a variety of tools that can be used to perform OBD-II vehicle diagnostics. These tools can be simple tools for the average consumer, to more advanced OEM tools, and vehicle system for telematics. Hand-held scanners and fault code readers are among the most basic tools. However, there are high-end and robust tools available on the market. A scanner tool can read the diagnostic trouble codes that are stored in a vehicle’s computer system. It can also read the vehicle's VIN. OBD-II scanners have a feature that reads codes from any protocol. A mechanic can interpret and read the data and provide you with all information regarding the problem with your vehicle. OBD-II diagnostics for vehicles can help you save money on repairs and improve your car's performance. They can also give information about the health and condition of key engine components as well as emission control. This information is useful for diagnosing issues quickly and efficiently. CANBUS A scanner tool can be used to analyze the entire system of a vehicle that is CANBUS compatible. This will allow you to discover which modules are supposed to be on and which are not. If one or more of these modules is not working, this could be an indication of a communication issue or wiring issue. CAN bus issues can cause a variety of symptoms, including partial or total loss of vehicle functionality. The faults may cause an audible or visual indication for the operator of the vehicle. Other signs could be caused by software issues. A CAN bus problem can also cause a defective charging system, battery voltage or improper connections. Low resistance readings on CAN ports are an indication of a defective wiring harness or CAN. Certain CAN devices could have an internal termination resistor which switches between on and off when the device starts up. The manufacturer's service manual should include the information about the internal termination resistors that are unique to a Can device. The CAN bus protocol is a message-based protocol designed to communicate between automobile components. In addition to allowing communication between vehicles it also helps save copper by using multiplex electrical wiring. Each device transmits data in a frame, that is received by all devices on the network. Check engine light A Check engine light on your car could signal an issue that's serious. If you've noticed an orange or red light on your dashboard, consider having your car examined immediately. It will cost you less to fix it the faster you fix it. There are other signs, like engine noises or abnormal engine sounds. No matter the reason regardless of the cause, the Check Engine Light is meant to warn you of a problem in your vehicle. The Check Engine Light is an orange engine-shaped icon , which is located in the instrument cluster. It is activated when the car’s on-board computer detects a problem. There are a variety of reasons that could cause this indicator to appear and some of the time, these issues are as simple as a loose gas cap or a spark plug. Another possible cause for an Check Engine Light is a problem with the exhaust system. An exhaust gas recirculation valve (EGR) can cause this light to turn on. These valves don't require regular maintenance , but they could become blocked with carbon and require to be replaced. EGR valves that are not working properly could also result in higher levels of emissions. After you've resolved this issue, your car's sensors will shut off the light automatically. If your car's CEL is on for more than three days, you may want to check it again, or manually reset the light. A diagnostic scan will help you determine which codes are causing your Check Engine light to flash. Sometimes just a quick scan using a basic scan tool will uncover the root of the issue. For more complicated issues you'll need professional scanners. Diagnostic trouble codes Diagnostic trouble codes, also referred to as DTCs are digits used to describe problems with your vehicle. These codes could be as short as one to five characters long and can indicate anything from a warning light or an engine that is not functioning. These codes are used to solve issues and pinpoint where they occur. Although DTCs are used to identify vehicle problems however, not all are serious. In some instances, trouble codes indicate that a sensor circuit is out of range, or there is a malfunction has occurred in the emissions control system. Once you have identified the problem you can then begin to address the issue. It is important to determine the location of trouble codes in your vehicle. Typically, DTCs are stored in the Engine Control Module (ECM) or the Powertrain Control Module (PCM). It is also essential to determine the root of the problem using diagnostic trouble codes. how much diagnostic test on car can aid a mechanic to identify the issue and determine the most effective solution. The check engine light could indicate a problem in the fuel level sensor circuit. It could be an indication of an issue with the emissions idle control system. Other times, the light could be a sign of something more serious, like gas caps that have become loose. Some of these codes can be urgent and require immediate repair. It is crucial to determine which DTC is the most serious and fix it immediately in the event that you have more than one. Checking fuel supply Car diagnostics can be complicated due to the importance of fuel pressure and volume. A damaged fuel pump can set diagnostic trouble codes in the computer of your vehicle. You can identify these codes by using the code reader or scan tool. Many auto parts stores offer codes reading services for no cost. You can also purchase cheap code reading devices for smartphones. Once you've learned what to look for, you can start checking the pressure in your fuel system. It's a simple step by method procedure to test your fuel supply. It's simple to perform. The first step to check the fuel system is to listen for an emitted sound. It should last for around 2 seconds before it stops. If you hear a sound, it is likely that the electrical circuit inside the fuel pump is functioning properly. If not, it is time to perform further tests to determine the cause. In addition to monitoring the fuel pressure in addition, you can examine the MAF sensor for leaks and clogged fuel injectors. A MAF sensor that is dirty could be the culprit of the P0171/P0174 codes. If you aren't sure what part to replace You can make use of a volumetric efficiency chart or calculator to determine which. To ensure the health of your vehicle It is vital to test the fuel pressure. If your vehicle is not running properly, even if the pressure is high, it will have difficulties starting. Low flow of fuel could result in poor readings of pressure on the voltage meter. You can test the ampage and voltage of the injector pulses by using a scope and an amp clamp. Checking the air filter If your car's air filter is dirty, it can cause a variety of problems, ranging from an acceleration that jolts to unburnt fuel and tiny explosions. It is possible to spot problems early by examining your air filter. Start by removing any fasteners that connect the air intake box together. They could be screws, clips or Hex nuts. Once the fasteners are removed then you can pull the air filter out. Make sure the filter is properly situated and cleaned. This will allow it to work correctly. The engine may not function properly if the filter is dirty. It could also fail to give precise readings. The air filter is usually located close to the engine, or near the front of the vehicle. A blocked air filter may also trigger the check engine light to flash. This light could indicate something more serious. A blocked air filter can cause too much fuel to be burned by restricting air flow into your engine. Carbon deposits in excess can cause the check engine warning light to appear. A professional mechanic will be able identify the cause of the light's appearance. Changing the air filter is an essential part of a car's engine. It keeps impurities and dust from the engine's air which leads to better combustion. If the airflow is not properly maintained the engine will experience problems starting, running or increasing.