Purpose/Function
The oil pump generates hydraulic pressure in the oil line of the automatic transaxle together with supplying lubrication to powertrain related parts.
Construction
The oil pump has adopted a gear type with built-in outer and inner rotors.
The inner rotor engages with the torque converter and rotates in conjunction with the rotation of the torque converter.

Operation
When the inner rotor in the oil pump rotates, vacuum is generated in the outer rotor. As a result, ATF in the oil pan is suctioned to the oil pump. Further rotation of the inner rotor causes the inner rotor blades to push the ATF and discharge it from the oil pump.
The ATF discharge flow amount increases or decreases in proportion to the rotation speed of the inner rotor.

Oil Pump Removal/Installation [Skyactiv G 2.0]
Oil Pump [Skyactiv G 2.0]Negative Battery Cable Disconnection/Connection [Skyactiv G 2.0]
WARNING:
Before removing the SRS air bag system-related parts, always disconnect the
negative battery cable and wait for 1 min. or more to allow the back-up power
supply to deplete its stored power..
Required procedure after negative battery cable disconnection/connection
...
Manual Transaxle Shift Mechanism Removal/Installation [C66 M R]
1. Disconnect the negative battery cable..
2. Remove the shift lever using the following procedure:
a. Remove the upper panel..
b. Remove the shift lever knob.
c. Remove the shift panel..
d. Remove the side wall..
e. Remove the rear console..
f. Press the tabs on the control cable ...
Ventilator Grille Removal/Installation
Side Ventilator Grille
Driver-side
1. Disconnect the negative battery cable..
2. Remove the switch panel..
3. Insert your hand from the area where the switch panel was installed, remove
the side ventilator grille in the direction of the arrow shown in the figure while
detaching hooks A.
...