How to connect an AA battery to your MPVI2 Prolink to troubleshoot
In some instances you may be asked to troubleshoot your MPVI2 or Pro Link by connecting it to a AA battery to rule out a hardware issue. Here is a brief summary of what you will need to do:
1) You'll need to insert the raw voltage PID into the #1 slot in your table display.
2) Connect the Red Wire on the Pro Link to the Positive terminal of the AA battery.
3) Connect the Black Wire on the Pro Link to the Negative terminal of the AA battery.
4) Now connect your interface to your vehicle and begin logging.
Without the AA battery connected the voltage will likely hover around 1.34-1.37 volts this is perfectly normal.
New AA batteries will put out ~1.5V-1.6V, so if your interface is reading this voltage perfectly in the scanner then you likely have an issue somewhere else. This may be a custom PID that is incorrect, or your wideband controller may not have been properly configured.