Kia Optima Hybrid: Hydraulic System / Electric Oil Pump (EOP) Description and Operation

Description
This transaxle has a standard Mechanical Oil Pump (MOP) linked to the input shaft to generates oil pressure when input shaft rotates. Being a hybrid, this transaxle also has an Electric Oil Pump (EOP). Because the hybrid features Auto-Stop which starts and stops the engine as needed. The Auto-Stop feature prevents the Mechanical Oil Pump (MOP) from operating and building enough pressure for the transaxle to operate. When the vehicle comes to a stop with the engine off, Mechanical Oil Pump (MOP) cannot generate sufficient oil pressure during the initial startup (below 5 KPH) or during low speed driving. For these reasons, the Electric Oil Pump (EOP) takes on this role as an additional device that can generate the required oil pressure when the vehicle comes to a stop or during low speed driving. The Electric Oil Pump (EOP) not only supplies oil pressure to the Under Drive Brake (UD/B), but it also feeds the oil pressure to the Engine Clutch (E/C).
While low speed driving or engine auto stop, it supplies oil pressure to Under Drive Brake (UD/B) of automatic transaxle.
To supply oil pressure to Engine Clutch (E/C) when engine power is needed.

Electric Oil Pump (EOP) Operation
Starting & Creep driving (Low speed)
Element
Operation
Description

HSG
Stop
- Vehicle moves by motor (EV mode)
> EOP operates in order to supply hydraulic pressure for 1st gear in A/T at the time of vehicle starting
Motor
Rotation
Engine
Stop
E/Clutch
Disengage
EOP
Rotation
A/T
1st gear
Auto Stop
Element
Operation
Description

HSG
Stop
- EOP operates to supply the hydraulic pressure (in order to be ready to vehicle starting)
> You can hear the EOP operating sound
Motor
Stop
Engine
Stop
E/Clutch
Disengage
EOP
Rotation
A/T
D range

ATF Warmer Repair procedures

Removal 1. Remove the under cover (A). Tightening torque : 7.8 ~ 11.8N.m (0.8 ~ 1.2kgf.m, 5.8 ~ 8.7 lb-ft) 2. Drain the coolant of engine & transaxle cooling system. (Refer to Engine Mechanical System ...

Electric Oil Pump (EOP) Specifications

Specifications PumpPumping capacityAbout 6.46cc per one revolutionTypeInternal gearMotorType Brushless DC motor (3 phases)Torque Rated 1.5 N.mSpeed range100~2,500 rpm ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Seat Track Position Sensor (STPS) Repair procedures


Removal 1. Disconnect the battery negative cable, and wait for at least three minutes before beginning work. 2. Remove the front seat assembly. (Refer to BD group) 3. Loosen the two STPS screws, then remove the STPS after disconnecting the STPS connector. Installation     Be sure to install ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Rear Upper Arm Repair procedures


Replacement 1. Remove the rear wheel & tire. Tightening torque: 88.3 ~ 107.9N.m(9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft)     Be careful not to damage the hub bolts when removing the rear wheel & tire. 2. Loosen the bolt & nut and then remove the rear upper arm (A) from the rear axle. ...

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