P0455
P0455General 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"?
YES - Check the Fuel Filler Cap is installed. If not after closing it go to "Evap.Leakage Test" as below with scan tool.
NO - Go to "Evap.Leakage Test" as below with scan tool.
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?
YES - Go to "System Inspection" procedure.
NO - Fault is intermittent caused by the fuel cap missing and go to "Verification of vehicle Repair" procedure.
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?
YES - Go to "Check vapor hoses for leakage in fuel system" as below.
NO - Replace the Fuel Filler Cap and go to "Verification of Vehicle Repair" procedure.
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?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check vapor hoses for stuck in fuel system" as below.
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 stick exist?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check fuel filler pipe for crack or leakage" as below.
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?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Component Inspection" procedure.
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?
YES - Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check Canister for leakage" as below.
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?
YES - Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check fuel tank for leakage" as below.
Check fuel tank for leakage
1. Check fuel tank for crack or leakage.
2. Does a leak exist?
YES - Repair or replace as necessary and then go to Verification of Vehicle Repair procedure.
NO - Carefully perform this troubleshooting procedures all over again from the beginning.
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"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.