Maintaining your 2017 Subaru WRX is crucial for its longevity and performance. For DIY enthusiasts, tasks like changing the CVT (Continuously Variable Transmission) fluid and differential fluids are common. However, some procedures require specialized tools, particularly a scan tool to monitor crucial parameters like transmission temperature. This article will guide you on selecting the right scan tool, focusing on the “2017 Subaru Wrx Scan Tool Abs” keyword, and provide insights based on practical experience.
Performing a CVT fluid change on your Subaru WRX isn’t just about draining and refilling. A critical step involves monitoring the CVT fluid temperature to ensure accurate fluid level adjustment. Standard scan tools often lack the capability to read CVT temperature, making the process challenging. This is where specialized diagnostic scan tools come into play.
One recommended tool, as personally used, is the Innova 5510 diagnostic scan tool. This tool is capable of monitoring CVT temperature, a necessity for the precise CVT fluid fill procedure outlined in the Subaru service manual. Its long cord is particularly useful, allowing you to keep the scan tool connected and monitor temperature readings while under the car performing the fill procedure.
Step-by-Step CVT Fluid Change Procedure for 2017 Subaru WRX
To give you a clearer picture, here’s a breakdown of the CVT fluid change procedure, emphasizing the role of the scan tool:
- Drain the Old Fluid: Begin by draining the CVT fluid while the transmission is cold. This maximizes the amount of old fluid removed.
- Initial Fill: Refill the transmission with new CVT fluid until it starts to overflow from the fill hole. Temporarily install the fill plug, just finger-tight.
- Temperature Monitoring Setup: Start the engine and connect your scan tool, like the Innova 5510, to the OBD2 port. Navigate to the transmission temperature reading on the scan tool display.
- Gear Cycling: Once the scan tool indicates a transmission temperature of 35 degrees Celsius (95 degrees Fahrenheit), cycle through the gears. Shift from Park to Reverse, Neutral, Drive, back to Neutral, Reverse, and finally to Park (P-R-N-D-N-R-P), pausing for approximately 10 seconds in each gear. This ensures proper fluid circulation.
- Final Fill and Level Check: Quickly get back under the car, keeping the scan tool connected to monitor the temperature. Remove the fill plug and add more CVT fluid until it overflows again. This step must be done while the transmission temperature is within the specified range of 35°C to 45°C (95°F to 113°F). You have a limited time window of about 6 minutes to complete steps 4-6 before the temperature exceeds this range.
- Finalize and Torque: Reinstall the fill plug and torque it to the manufacturer’s specified torque.
Tools to Simplify the Process
To make the CVT and differential fluid changes smoother, consider using a manual fluid filler system. A tool like the ABN Manual ATF Filler System is highly recommended. This system allows for easy and controlled fluid dispensing into the transmission and differentials.
When using a fluid filler system, it’s advisable to use the appropriate adapters, such as the right-angle adapter, for easier access to fill ports. It’s also important to avoid over-pressurizing the system; staying below 15 PSI is recommended, even if the tool is rated higher. Filling the system with fluid can be done using a funnel through the top opening.
Fluid Choice and Maintenance Frequency
For CVT fluid, using a high-quality aftermarket fluid like Amsoil CVT fluid is a viable option. Personal experience indicates no issues with Amsoil CVT fluid in Subaru WRX applications. To thoroughly replace the original fluid, performing multiple drain and refills is recommended. A single drain and fill typically replaces only about 40-45% of the total CVT fluid. Multiple changes, like three drain and refills, will significantly increase the percentage of new fluid in the system.
Beyond CVT: ABS and Comprehensive Diagnostics
While this article focuses on CVT fluid changes, a quality scan tool like the Innova 5510 is also capable of reading and clearing ABS (Anti-lock Braking System) codes, along with other diagnostic functions. This makes it a versatile tool for overall 2017 Subaru WRX maintenance and troubleshooting. Investing in a scan tool that supports various systems, including ABS, SRS (Supplemental Restraint System), and engine codes, provides greater value and empowers you to handle a wider range of maintenance and repair tasks on your vehicle.
Conclusion
Choosing the right scan tool is essential for specific maintenance procedures like a 2017 Subaru WRX CVT fluid change. Tools like the Innova 5510 provide the necessary functionality to monitor transmission temperature accurately, ensuring proper fluid level and optimal CVT performance. Furthermore, these scan tools often extend beyond CVT monitoring and offer comprehensive diagnostic capabilities, including ABS code reading, making them a valuable asset for any Subaru WRX owner who prefers DIY maintenance. By investing in the right tools and following the correct procedures, you can confidently maintain your 2017 Subaru WRX and ensure its continued performance and reliability.
