1. Connect the WDS or equivalent to the DLC-2.
2. Measure the PID value.
Note
PID/DATA MONITOR AND RECORD function table

Dtc p0841
TroubleshootingMazda 6 Service Manual: Transmitter battery inspection
Caution
Since the battery voltage does not drop fully if the button is
pushed for only 4 seconds or less, it can not be properly examined to see
whether it is good or bad. Always push the button for 5 seconds.
Note
A correct measurement can not be obtained if the battery
temperat ...
Mazda 6 Service Manual: Distance-to-empty
This displays the approximate distance you can travel on the remaining fuel based
on the fuel economy.
The distance-to-empty will be calculated and displayed every second.
NOTE
Even though the distance-to-empty display may indicate a sufficient amount
of remaining driving distance befor ...