P0455

General Description

The evaporative emission control system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The PCM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustion. This valve is actuated by the purge control signal from the PCM and controls fuel vapor flow from the canister to the intake manifold.

DTC Description

Checking output signals from fuel tank pressure sensor under EVAP.system test, if fuel tank's vacuum is lower than prescribed threshold, PCM sets P0455 and then MIL(Malfunction Indication Lamp) turns on.

DTC Detecting Condition





Monitor Scantool Data

Check DTC Status
1. Connect scantool to Data Link Connector(DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.




5. Is parameter displayed "Present fault"?�





EVAP. Leakage Test
1. Cool the vehicle down for about two hours to prevent misdiagnosis.
2. Install scan tool and IG "ON" and then clear DTC.
3. Select and press "EVAP.LEAKAGE TEST" mode in the scan tool.
4. Check if the vehicle is under test conditions as below [Fig 1].
5. If OK, Start engine and restart EVAP.Leakage Test again[Fig 2].








6. Is the same DTC set after the EVAP.leakage test with scan tool ?






System Inspection

Check Fuel Filler Cap
1. Check the Fuel Filler Cap is installed and properly tightened.
2. Check if the Fuel Filler Cap seal is missing or damaged.
3. Is the Fuel Filler Cap OK?





Check vapor hoses for leakage in fuel system
1. Check vapor hoses between the following components for leakage:
> Intake manifold ~ Purge control solenoid valve (PCSV)
> Purge control solenoid valve (PCSV) ~ Canister
> Canister ~ Canister close valve (CCV)
> Canister ~ fuel tank
2. Does a leak exist?





Check vapor hoses for stuck in fuel system
1. Check vapor hoses between the following components for stuck:
> Intake manifold ~ Purge control solenoid valve (PCSV)
> Purge control solenoid valve (PCSV) ~ Canister
> Canister ~ fuel tank
2. Does a leak exist?





Check fuel filler pipe for crack or leakage
1. Check that there is crack or leakage in fuel filler pipe.
2. Is there any crack or leakage ?






Component Inspection

Check CCV for leakage
1. Disconnect the hose leading from the CCV to Canister at CCV.
2. Visually Check any tear of the hose leading from the CCV to Canister
3. When the CCV operates, apply a vacuum at the nipple and verify that the CCV holds vacuum.
4. Does a leak exist?





Check Canister for leakage
1. Disconnect the hose leading from the CCV to Canister at Canister.
2. When the other nipples are plugged, apply a vacuum at the vent nipple and verify that the Canister holds vacuum.
3. Does a leak exist?





Check fuel tank for leakage
1. Check fuel tank for crack or leakage.
2. Does a leak exist?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "DTC" button.
2. Press "DTC Status" button and confirm that "DTC Readiness Flag" indicates "Completed". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History(Not Present) fault"?