Experiencing trouble connecting your OBDII reader to your 1999 Miata using the Torque app? You’re not alone. Many owners of older vehicles encounter similar issues when using generic OBDII adapters and software. This guide will walk you through how to manually specify the OBDII protocol within the Torque app, potentially resolving connection problems and unlocking your Miata’s diagnostic data.
Understanding OBDII Protocol Specification in Torque
Modern vehicles use standardized OBDII (On-Board Diagnostics II) protocols for communication between diagnostic tools and the car’s computer (ECU). However, the OBDII standard encompasses several protocols, and older cars like the 1999 Mazda Miata might not automatically connect with the “Auto” protocol setting in apps like Torque. Forcing Torque to try every protocol can sometimes fail, leading to the frustrating “No response from vehicle ECU” error. Manually specifying the correct protocol for your Miata can often establish a reliable connection.
To specify the protocol in Torque, navigate to the “Settings” menu within the app. Look for “OBD2 Adapter Settings” or a similar option. Within these settings, you should find a “Connection Type” or “Protocol” setting, likely defaulted to “Auto.” Tap on this setting to reveal a list of OBDII protocols.
While the exact protocol for a 1999 Miata can vary slightly, it’s often compatible with ISO 9141-2 or KWP2000 (ISO 14230) protocols. Try selecting “ISO 9141-2” first, as this is commonly used in older Japanese vehicles. After selecting the protocol, attempt to connect Torque to your OBDII adapter again. If “ISO 9141-2” doesn’t work, repeat the process and try “KWP2000 (ISO 14230)”.
Common Issues and Troubleshooting for 1999 Miata OBD-II Connection
If specifying the protocol doesn’t immediately solve the problem, consider these additional troubleshooting steps:
1. OBD-II Port Location: You mentioned finding a port under the fuse box cover to the left of the driver’s knee. This is indeed the standard OBDII port location for the NB Miata (1999-2005). It’s unlikely there’s another hidden port. The location can feel a bit awkward, but it is the correct one.
2. Reader Compatibility: While the BAFX adapter is generally well-regarded, compatibility issues can still arise, especially with older vehicles. NB Miatas can sometimes be sensitive to certain OBDII readers. If protocol specification fails, the adapter itself might be the issue. Consider trying a different OBDII reader known for good compatibility with Mazda vehicles if you continue to experience problems. Online Miata forums and communities can be valuable resources for recommendations on compatible OBDII readers.
3. App Compatibility: Although Torque is a popular and generally reliable app, ensure you are using the latest version. While you mentioned trying “Car Gauge Lite,” sticking with Torque for troubleshooting protocol issues is advisable as it offers more protocol customization options.
Conclusion
Specifying the correct OBDII protocol in Torque is a crucial step when connecting to a 1999 Miata. By manually selecting “ISO 9141-2” or “KWP2000 (ISO 14230)” in the Torque app’s settings, you increase the chances of establishing a successful connection and accessing your vehicle’s diagnostic information. If issues persist, consider OBDII reader compatibility as a potential factor. With these steps, you should be better equipped to diagnose and monitor your 1999 Miata using Torque and an OBDII adapter.
