ELM327 Test is used to check the operation of devices with an ELM327 diagnosis. If you have a, ELM327 device, with this application you can: Check the correct operation of your device or possible connection problems, protocol problems or hardware failures in the device. Identify the current version of the device. (ELM327 v1. 0, v1. 1, v1. 2, v1. 3, v1. 3a, v1. 4, v1.