Kia Optima Hybrid: Evaporative Emission Control System / Repair procedures

Inspection
When the engine is shut off, the pressure change in the fuel tank by the ambient temperature is monitored by NVLD and when the engine is started, ECM judges whether there is a leak or not through the monitored data.
If a leak is detected, ECM displays DTC P0455 or P0456.
Process overview
If a leak is detected by NVLD, inspect the vehicle as the flow chart below to distinguish whether the error was caused by leakage of fuel system or NVLD itself.

Leakage Test with FTPS(Fuel Tank Pressure Sensor)
If a leak is detected by NVLD, leakage test with FTPS is performed more than 3~5 times to check tank system components. This test is only for production line or service shop to check where the real cause(NVLD or fuel system) of DTC P0455 or P0456 is.
1.
Turn the ignition switch OFF.
2.
Connect the GDS to Data Link Connector (DLC).
3.
Start the engine.
4.
Select “Vehicle, Model year, Engine, System”.
5.
Select “Vehicle S/W Management”.
6.
Select “Inspection / Test”.
7.
Select “Evap. Leak Test”
8.
Perform the test in accordance with the image below.

Schematic Diagrams

Schematic Diagram Canister The Canister is filled with charcoal and absorbs evaporated fuel vapor from the fuel tank. The gathered fuel vapor in canister is drawn into the intake manifold by the ECM/PCM ...

Canister Repair procedures

Removal 1. Turn the ignition switch OFF and disconnect the auxiliary battery 12 (V) negative (-) terminal. 2. Lift the vehicle. 3. Remove the rear muffler hanger (A). 4. Remove the rear suspension damper ...

Other information:

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


Components 1. Intake manifold assembly 2. Intake manifold gasket3. ETC (Electronic throttle body)4. Intake manifold stay ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Cylinder Head Repair procedures


Removal     • Use fender covers to avoid damaging painted surfaces. • To avoid damaging the cylinder head, wait until the engine coolant temperature drops below normal temperature before removing it. • When handling a metal gasket, take care not to fold the gasket or damage the contact ...

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