Dealing with a Check Engine light can be frustrating. Instead of immediately heading to a mechanic, many car owners are turning to DIY diagnostic tools. Among these, the Actron Cp9175 Obd Ii Plus Diagnostic Code Scanner stands out as a popular choice. But what exactly is an OBD II scanner, and why might the Actron CP9175 be the right tool for you? Let’s delve into the world of automotive diagnostics and explore how this scanner can empower you to understand and address car issues from the comfort of your garage.
To appreciate the capabilities of modern scanners like the Actron CP9175, it’s helpful to understand their origins. The journey began with On-Board Diagnostics (OBD) systems in 1982. Known as OBD I, these early systems were a significant first step, offering basic diagnostic codes. However, the lack of standardization was a major hurdle. Connector types, locations, and communication protocols varied widely between car manufacturers. This meant mechanics needed a costly array of manufacturer-specific scanners, modules, and cables. Interestingly, some manufacturers, like Chrysler, even implemented a “key dance” method, using ignition key turns to flash trouble codes through dashboard lights. Today, basic OBD I testers are very affordable, often found for just a few dollars online.
A major leap forward came in 1996 when OBD II became mandatory for all cars sold in the US. This specification brought much-needed standardization, defining a universal connector, its location, and communication protocols. Europe adopted OBD II in the early 2000s, sometimes referred to as EOBD. It’s crucial to understand that these scanners primarily interface with the main car computer, not necessarily with other systems like transmission, HVAC, or ABS. While high-end professional scanners can communicate with these systems, they remain manufacturer-specific and expensive.
For DIY enthusiasts, OBD II code scanners come in three main categories, each offering increasing levels of functionality:
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Code Readers: These are the entry-level tools, typically priced from $50 to $100, and sometimes cheaper online. Their primary function is to read diagnostic trouble codes (DTCs) and, in many cases, reset the Check Engine light. More advanced code readers may include built-in code definitions, displaying not just the code but also the associated fault. Some can read Vehicle Identification Numbers (VINs) on newer vehicles, offer internet update capabilities, retain data when disconnected, and even read OBD I with adapters. Select models can also capture snapshots of sensor data like RPM, fuel flow, and O2 sensor voltage.
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Scanners: Moving up in capability, scanners encompass all the features of code readers but add real-time data monitoring. This means they can record and display live sensor data, providing a dynamic view of your car’s operation. Better scanners can present this data graphically on their screen and connect to a PC for data download and updates. High-end scanners often include built-in troubleshooting tips and help resources for specific codes. Prices range from $80 to $250, with good deals available online for around $100. The Actron CP9175 OBD II Plus Diagnostic Code Scanner falls into this category, offering a balance of features and affordability for the DIY user.
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PC-Based Tools: This category utilizes software (proprietary or open-source) and interface cables (serial or USB) to connect a laptop to your car’s OBD II port. PDA-based tools were once popular but are less common now. PC-based systems offer advantages like real-time data monitoring, data logging, and the ability to create customized virtual dashboards. Numerous vendors offer software and interface kits at varying price points.
It’s important to note two key limitations. Firstly, none of these DIY scanners allow you to reprogram your car’s operating parameters. That requires specialized tuning software and equipment. Secondly, since 2003, many manufacturers have adopted the Controller Area Network (CAN) protocol, which became mandatory for all vehicles in 2008. CAN offers significantly faster communication speeds compared to older OBDII protocols, enabling technicians to access data more quickly and obtain more detailed information from newer cars. When choosing a diagnostic tool, it’s highly advisable to select a CAN-compliant unit, like the Actron CP9175, as CAN uses the same connector as OBD II.
Leading brands in the DIY scanner market include Actron and Innova/Equus. Craftsman also markets a line of scanners. While other brands like AutoXray and MechanicDoctor exist, Actron and Innova are generally the most popular. Actron scanners are frequently used by auto parts stores to read codes for customers. More recently, scanners from Chinese manufacturers like TopTak have emerged, but user reviews are mixed.
In conclusion, understanding OBD II systems and the range of available scanners empowers car owners to take a more proactive approach to vehicle maintenance. The Actron CP9175 OBD II Plus Diagnostic Code Scanner, as a mid-range scanner, offers a robust set of features for diagnosing Check Engine lights and monitoring vehicle performance, making it a valuable tool for any DIY car enthusiast looking to save time and money on auto repairs.
