P0455
DTC P0455Due to the increasing ambient temperature of the fuel, fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.
DTC DESCRIPTION
This test detects a leak by measuring an increase of vacuum in the fuel evaporative system. A leak in evaporative system can allow hydrocarbons to leak from the tank to the atmosphere when the engine is off. The test should be calibrated to detect a 0.04" (1 mm) leak.If there is a large leak above the threshold value in the fuel evaporative system, ECM/PCM sets P0455.
DTC Detecting Condition:
MONITOR SCANTOOL DATA
1. Connect scantool to DLC(Data Link Cable)
2. Warm-up the engine to normal operating temperature.
3. Erase DTC currently displayed.
4. Perform the "EVAP. LEAKAGE TEST" with scantool.
5. Is the same DTC displayed after "EVAP. LEAKAGE TEST" has done ?
YES - Go to "System Inspection" procedure.
NO - Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
SYSTEM INSPECTION
1. Check evaporative emission system
a. Visually checks connections and components for leakage the evaporative emission system as follows.
- Between Surge tank and PCSV.
- Between PCSV and Canister
- Between Canister and CCV
- Between Canister and Fuel Tank.
b. Has a problem been found ?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check Leakage in Fuel Line" as follows.
2. Check Leakage in Fuel Line
a. Check that fuel cap is firmly tightened.
b. Check any damage or leakage in fuel line.
c. Has a problem been found ?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Component Inspection" procedure.
COMPONENT INSPECTION
1. Check PCSV
a. Disconnect vacuum Hose connected between Surge tank and PCSV.
b. Connect vacuum pump to disconnected vacuum hose.
c. Does PCSV retain vacuum ?
YES - Go to "Check CCV" as follows.
NO - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
2. Check CCV
a. Disconnect vacuum hose between Canister and CCV from Canister
b. Connect a vacuum pump and apply vacuum to each hose.
c. Does CCV retain vacuum ?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Go to "Check canister" as follows.
3. Check Canister
a. Disconnect vacuum hoses connected to canister.
- Check any damage or leakage on vacuum hose between Canister and CCV.
- Check any damage or leakage on vacuum hose between Canister and Fuel Tank.
- Check any damage or leakage on vacuum hose between Canister and PCSV.
b. Connect vacuum gauge to one of vacuum hoses and apply vacuum one by one.(The rest of vacuum hose should be blocked.)
c. Is the vacuum retained ?
YES - Go to "Check Fuel Tank" as follows.
NO - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
4. Check Fuel Tank.
a. Check any damage or leakage on Fuel Tank.
b. Has a problem been found ?
YES - Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
NO - Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present ?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.