Kia Optima: Repair procedures - Evaporative Emission Control System - Emission Control SystemKia Optima: 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)


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 t ...

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 re ...

See also:

Engine Temperature Gauge
This gauge shows the temperature of the engine coolant when the ignition switch is ON. If the gauge pointer moves beyond the normal range area toward the H position, it indicates overheating that ...

Inspection
1. Check the hands free remote control switch for resistance between terminals in each switch position. Switch Connector terminal ...

Output Speed Sensor. Troubleshooting
Signal Waveform Fig 1) Input/Output speed sensor at low speedFig 2) Input/Output speed sensor at high speed ...

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