The AEM X-Series wideband gauge, like many other AEM wideband systems, likely has a data output wire for logging purposes beyond the standard OBD2 port. This output allows you to connect the gauge to a data logging device or another ECU, such as an AEM Infinity. This article explores how to log wideband AFR data using an Aem Obd2 Cable and other potential connection methods.
Typically, AEM wideband gauges include a dedicated output wire for analog data logging. This wire carries the wideband AFR signal, which needs to be converted for use with a laptop or data logger. A common solution involves using a serial-to-USB cable. This cable allows you to connect the AEM gauge’s analog output to your computer’s USB port, effectively turning it into a virtual serial port.
To use a serial-to-USB cable with your AEM gauge, you’ll need to identify the correct signal and ground wires on the gauge’s wiring harness. Consult the AEM gauge’s installation manual to locate these wires accurately. Once connected to the serial-to-USB cable, connect the USB end to your laptop. Data logging software, such as EvoScan, can then be configured to read the AFR data from the assigned virtual COM port. Within the software, select the appropriate sensor (e.g., UEGO) from the available options.
While using a dedicated serial output and a serial-to-USB converter is a reliable method, some users utilize the disabled rear O2 sensor wires for data logging, especially if their vehicle’s ECU supports disabling the second O2 sensor (such as with Mode 23). However, this method requires a more in-depth understanding of your vehicle’s wiring and ECU configuration.
If your AEM X-Series gauge offers an alternative digital output for data logging, such as CAN bus, you might require a different type of AEM OBD2 cable or adapter. Always refer to the manufacturer’s documentation for your specific AEM gauge model to determine the correct connection method and compatible data logging equipment. Understanding the specific output signal type of your AEM gauge is crucial for successful wideband AFR logging.
Ultimately, logging wideband AFR data from your AEM gauge requires identifying the correct output method (analog or digital), using the appropriate AEM OBD2 cable or adapter, and configuring your data logging software correctly. By following the manufacturer’s instructions and understanding the principles outlined in this article, you can effectively monitor and record your engine’s air/fuel ratio for performance tuning and diagnostics.
