1. Remove the rear accessory socket..
2. Connect the tester probe to the position shown in the figure and verify that there is continuity.

If it cannot be verified, replace the rear accessory socket..
Front Accessory Socket Removal/Installation
Rear Accessory Socket Removal/InstallationAUX/USB/iPod mode
Audio can be heard from the vehicle's speakers by connecting a commercially available
portable audio unit to the auxiliary jack.
A commercially-available, non-impedance (3.5 ) stereo mini plug cable is required.
Contact an Authorized Mazda Dealer for details.
In addition, audio can be playe ...
Direct Fuel Injection System
Purpose, Outline
Engine output has been improved through the direct injection of fuel into
the combustion chamber.
High response can be because there is no time lag from when the fuel injection
starts until the fuel is provided to the combustion chamber.
Structure
...
Fuel Distributor [Skyactiv G 2.0]
Purpose, Function
Distributes fuel pumped from the high pressure fuel pump to each fuel injector.
Construction
The fuel distributor is installed to the cylinder head.
The fuel distributor is integrated with the fuel pressure sensor.
...