Kia Optima Hybrid: Engine Control System / NVLD(Natural Vacuum Leakage Detection) Repair procedures

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Engine Control/Fuel System / Engine Control System / NVLD(Natural Vacuum Leakage Detection) Repair procedures

Removal

1.	Turn the ignition switch OFF and disconnect the battery negative (-) terminal.

2.	Disconnect the NVLD connector (A).

3.	Disconnect the ventilation hoses (B,C).

4.	Remove the NVLD after by loosening the bolts (A).

Installation

•	Install the component with the specified torques.

•	Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

1.	Install in the reverse order of removal.

NVLD mounting bolt:

2.3 ~ 3.3 N.m (0.2 ~ 0.3 kgf.m, 1.7 ~ 2.5 lb-ft)

Inspection

[Mechanical inspection]

1.	Turn ignition switch OFF.

2.	Disconnect the NVLD connector.

3.	Remove the NVLD.

4.	Connect the hose (A) to the canister hose connected port as below.

5.	After immersing the hose (A) in water, Apply more than 6 mbar (positive) pressure to Atmosphere port (B).

If the NVLD is normal, many bubbles will indicate large leak.

Allowable internal leakage of 0.35 g/hr at 3 mbar will show as one bubble every second (approximately).

[Electrical inspection]

1.	Connect power supply line and ground line to the NVLD terminals as below.

2.	Measure current between the NVLD terminal 1 and battery (+) terminal during NVLD switch open.

3.	Measure current between the NVLD terminal 1 and battery (+) terminal during NVLD switch closed.

4.	Measure current between the NVLD terminal 2 and battery (+) terminal during NVLD switch open.

Check the current is within the specification.

NVLD switch is normal open.

When applying more than 6 mbar (Positive) pressure to canister port, switch is closed.

NVLD(Natural Vacuum Leakage Detection) Schematic Diagrams

Circuit Diagram ...

Canister Close Valve (CCV) Description and Operation

Description Canister Close Valve (CCV) is installed on the canister ventilation line. It seals evaporative emission control system by shutting the canister from the atmosphere when leakage detecting system ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: High Voltage Shut-off Procedures

High Voltage Shut-off Procedures Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries. • High voltage components: ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Components and Components Location

Components Location 1. Drive shaft2. Lower arm3. Front disk4. Front strut assembly5. Steering gearbox6. Front stabilizer bar7. Sub frame ...